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AAON R90800 Technical Manual

R74870\ R69190\ R82930\ R69180\ R74860\ R90230\ V07150

Made by: AAON
Type: Technical Guide
Category: Controller
Pages: 16
Size: 2.30 MB

 

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Full Digital Module 

Technical Guide

Factory Packaged Controls

Tulsa

 


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Table of Contents

OVERVIEW ........................................................................................................................................................ 3

INSTALLATION AND WIRING ........................................................................................................................... 4

Environmental Requirements .......................................................................................................................................................4
Mounting.......................................................................................................................................................................................4
Power Supply and Communications ............................................................................................................................................4
Important Wiring Considerations ..................................................................................................................................................5
VCM-X Modular E-BUS Controller to Full Digital Module Wiring .................................................................................................6

START-UP AND COMMISSIONING .................................................................................................................... 8

General.........................................................................................................................................................................................8
Unit Confi gurations .......................................................................................................................................................................8

MODES OF OPERATION ................................................................................................................................... 9

Digital Stage 1 / Digital Stage 2....................................................................................................................................................9
Off Mode .......................................................................................................................................................................................9
Cooling Mode ...............................................................................................................................................................................9
Heat Pump Heating Mode (Air to Air) ...........................................................................................................................................9
Dehumidifi cation Mode .................................................................................................................................................................9
Defrost Mode ................................................................................................................................................................................9
Staging Delays .............................................................................................................................................................................9

TROUBLESHOOTING ...................................................................................................................................... 10

Using LEDs to Verify Operation..................................................................................................................................................10
LED Diagnostics .........................................................................................................................................................................12
Suction Pressure Transducer Testing .........................................................................................................................................13

APPENDIX ...................................................................................................................................................... 14

VCM-X Controller to Full Digital Module Wiring .........................................................................................................................14

WattMaster Controls Inc.
8500 NW River Park Drive · Parkville , MO  64152
Toll Free Phone: 866-918-1100
PH: (816) 505-1100 · FAX: (816) 505-1101 
E-mail: mail@wattmaster.com
Visit our web site at www.orioncontrols.com
WattMaster Form : AA-FDM-TGD-01G

Copyright July 2016 WattMaster Controls, Inc. 
AAON Manual Part Number: R84500
AAON

®

 is a registered trademark of AAON, Inc., Tulsa, OK.

Neither WattMaster Controls, Inc. nor AAON

®

 

assumes any responsibility for errors or omissions in this document.
This document is subject to change without notice.

www.aaon.com

PART NUMBER CROSS REFERENCE TABLE

PART DESCRIPTION

ORION

AAON 

VCM-X Full Digital Module

OE370-23-FDM-A

R74870

VCM-X Modular Controller

OE332-23-VCMX-MOD-A

R90800

VCM-X Modular E-BUS Controller

OE332-23E-VCMX-MOD-A

V07150

VCM-X E-BUS Distribution Module

OE365-23-EBD-A

R82930

VCM-X Expansion Module

OE333-23-EM

R69190

VCM-X 12 Relay Expansion Module

OE358-23-12R

R69180

VCM-X One Condenser Head Pressure Module

OE370-23-HP1C

R74860

VCM-X Two Condenser Head Pressure Module

OE370-23-HP2C

R90230

 


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Technical Guide

 

3

                     

 Full Digital Module

Overview

The Full Digital Module (OE370-23-FD-A) is a device that enables and 
modulates up to four digital compressors on HVAC Units controlled 
by the VCM-X Modular Controller (OE332-23-VCMX-MOD-A) or 
VCM-X Modular E-BUS Controller (OE332-23E-VCMX-MOD-A). 
The Full Digital Module will control the digital compressors to satisfy 
the cooling, dehumidifi cation, and heat pump requirements of the VCM-
X Modular series controller. 

If the Full Digital Module is in the Cooling Mode or Heat Pump Heat-
ing Mode, it will modulate the compressors to maintain the appropriate 
Supply Air Temperature Setpoint. If the module is in the Dehumidifi ca-
tion Mode, it will modulate compressors to maintain the Coil Suction 
Temperature Setpoint. If the module is in the Heat Pump Heating Mode, 
the module can also monitor a signal for a Defrost Cycle from the VCM-
X Modular series controller if a One Condenser Head Pressure Module 
(OE370-23-HP1C) is also installed. 

Module Overview

Figure 1:  Full Digital Module

The Full Digital Module is connected to the VCM-X Modular Control-
ler using the E-BUS Distribution Module (OE365-23-EBD). The Full 
Digital Module can also be directly connected to the VCM-X Modular 
E-BUS Controller. Either connection allows the Full Digital Module 
to receive setpoints and monitor the Supply Air Temperature from the 
VCM-X Modular series controller. The Full Digital Module requires a 
24 VAC power connection with an appropriate VA rating.

NOTE:  The Full Digital Module contains no user-serviceable 

parts. Contact qualified technical personnel if your 
module is not operating correctly.

www.orioncontrols.com

1003

1002

10uF

300

1
2
4
8

SERIA

L

#

C2

D3

D4

R7

R9

R11

R12

R13

R14

R23

R24

R25

R26

R28

R29

R30

SW1

D12

D13

R53

R54

TB3

C20

R34

R

50

SW2

+5V

SIG 2

GND

1003

1002

10uF

1003

1002

10uF

1003

1002

10uF

4751

4751

4751

4751

OFF

OFF

OP

T

ION
S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

300

GND

BIN 2

R1

4

R2

4

GND

1002

1002

1002

1002

1002

1002

1002

1002

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

R3

R4

Rc

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

.01uF

PWR

 


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Full Digital Module

Technical Guide

4

Environmental Requirements

The Full Digital Module needs to be installed in an environment which 
can maintain a temperature range between -30°F and 150°F and not 
exceed 90% RH levels (Non-Condensing). 

Mounting

The Full Digital Module is housed in a plastic enclosure. It is designed 
to be mounted by using the 3 mounting holes in the enclosure base. It is 
important to mount the module in a location that is free from extreme high 
or low temperatures, moisture, dust, and dirt. Be careful not to damage 
the electronic components when mounting the module. 

See Figure 2 for Module dimensions (dimensions are in inches).

Power Supply and Communications

The Full Digital Module is connected to the E-BUS Distribution Mod-
ule with a modular HSSC cable to provide communications from the 
VCM-X Modular Controller. The E-BUS Distribution Module uses 
WattMaster Control’s standard I

2

C modular cable to connect with the 

VCM-X Modular Controller, VCM-X Expansion Module, or 12-Relay 
Expansion Module. 

The Full Digital Module can also be directly connected to the VCM-X 
Modular E-BUS Controller, bypassing the use of the E-BUS Distribu-
tion Module.

The Full Digital Module requires a 24 VAC power supply with an ap-
propriate VA rating.

WARNING:    Observe polarity! All boards must be wired 

 

GND-to-GND and 24 VAC-to-VAC. Failure to 

 

observe polarity could result in damage to the 

 boards.

 

Installation and Wiring

5.04

5.64

5.71

2.07

0.55

4.14

0.29

0.18 DIA. TYP.

www.orioncontrols.com

1003

1002

10uF

300

1
2
4
8

SERIA

L

#

C2

D3

D4

R7

R9

R11

R12

R13

R14

R23

R24

R25

R26

R28

R29

R30

SW1

D12

D13

R53

R54

TB3

C20

R34

R

50

SW2

+5V

SIG 2

GND

1003

1002

10uF

1003

1002

10uF

1003

1002

10uF

4751

4751

4751

4751

OFF

OFF

OP

T

ION
S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

300

GND

BIN 2

R1

4

R2

4

GND

1002

1002

1002

1002

1002

1002

1002

1002

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

R3

R4

Rc

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

.01uF

PWR

Note: Height is 1.49 inches.

Figure 2:  Full Digital Module Dimensions

 


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Technical Guide

 

                     

Full Digital Module

5

Installation and Wiring

Important Wiring Considerations

Please carefully read and apply the following information when wiring 
the Full Digital Module:

1.    The 1 to 5 VDC signals for the Copeland Compressor 

Speed need to use 18-gauge shielded twisted pair cable, and 
the Drain wire must be the GND signal.

2.    All 24 VAC wiring must be connected so that all ground 

wires remain common. Failure to follow this procedure can 
result in damage to the module and connected devices.

3.    All wiring is to be in accordance with local and

national electrical codes and specifi cations.

4.    Be sure that all wiring connections are properly inserted 

and tightened into the terminal blocks. Do not allow wire 
strands to stick out and touch adjoining terminals. This 
could potentially cause a short circuit.

5.    Be sure all modular wiring harness connectors are seated 

fi rmly in their respective modular connectors on the circuit 
board.

NOTE:  The Compressor Relays on the Full Digital Module 

are used rather than the relay outputs on the VCM-X 
Modular series controller. 

WARNING:   Be sure all controllers and modules are 

 

powered down before connecting or

 

disconnecting HSSC cables.

Figure 3:  Full Digital E-BUS Connection Wiring

SHLD

SHLD

SHLD

OUT

OUT

OUT

COM

COM

COM

EXC

EXC

EXC

P4

P4

P4

BK

BK

BK

RD

RD

RD

WH

WH

WH

P2

P2

P2

P1

P1

P1

P3

P3

P3

P5

P5

P5

C1

C1

C1

C2

C2

C2

P6

P6

P6

SHLD

OUT

COM

EXC

P4

BK

RD

WH

P2

P1

P3

P5

AO1

SIG 1

SIG 2

SIG 3

SIG 4

AO2

GND

GND

GND

GND

C1

C2

P6

+5V

SIG 2

GND

OPTI

O

N

S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

GND

BIN 2

R1

R2

GND

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

R3

R4

Rc

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

OE275-01 Suction

Pressure Transducer

OE275-01 Suction

Pressure Transducer

OE275-01 Suction

Pressure Transducer

OE275-01 Suction

Pressure Transducer

OE370-23-FD-A

Full Digital Module

Copeland Digital

Compressor Controller B1

Copeland Digital

Compressor Controller A2

Copeland Digital

Compressor Controller A1

Copeland Digital

Compressor Controller B2

If Using One

Module, Set

Addresses To

Off. If Using

Two Modules,

Set Addresses
Consecutively.

This Dip

Switch Is Not

Used For This

Application

PWR

Connect To E-BUS

Distribution Module or

VCM-X Modular E-BUS Controller

Connect To Other

WattMaster-Approved

E-BUS Expansion Module(s)

HSSC Cable

24 VAC Transformer

3 VA Minimum

Line Voltage

24 V

A

C

GND

WARNING!!
Observe Polarity! All
boards must be wired
with GND-to-GND and
24 VAC-to-24 VAC.
Failure to observe
polarity could result in
damage to the boards.

HSSC Cable

NOTE:

NORMALLY OPEN AND

RATED FOR 24 VAC POWER

ALL RELAY OUTPUTS

ARE

COMPRESSOR A2 ENABLE

COMPRESSOR A1 ENABLE

R1

R4

R3

R2

COMPRESSOR B1 ENABLE
COMPRESSOR B2 ENABLE

ONLY.

1 AMP MAXIMUM LOAD.

HVAC UNIT CONNECTIONS

 


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Full Digital Module

Technical Guide

6

Installation and Wiring

VCM-X Modular E-BUS Controller to 

Full Digital Module Wiring

The Full Digital Module directly connects to the VCM-X Modular E-
BUS Controller using a modular HSSC cable. The Full Digital Module 
requires a 24 VAC power connection with an appropriate VA rating. See 
Figure 4 below for wiring.

Any E-BUS Module can be connected to the E-BUS Controller’s  E-BUS 
port or can be daisy-chained together using HSSC cables. 

NOTE:  Contact Factory for the correct HSSC cable length for 

your application. Cables are available in ½ and 3 meter 
lengths and 100 and 150 foot lengths.

Figure 4:  VCM-X Modular E-BUS Controller to Full Digital Module Wiring Diagram

Connect To Other

WattMaster-Approved

E-BUS Expansion Module(s)

HSSC Cable

HSSC Cable

Connect To VCM-X E-BUS Controller

OE370-23-FD-A

Full Digital Module

+5V

SIG 2

GND

OPTI

O

N

S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

GND

BIN 2

R1

R2

GND

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

R3

R4

Rc

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

PWR

24 VAC Transformer

3 VA Minimum

Line Voltage

24 V

A

C

GND

WARNING!!
Observe Polarity! All boards must be
wired with GND-to-GND and 24 VAC-
to-24 VAC. Failure to observe polarity
could result in damage to the boards.

This Dip Switch Is

Not Used For This

Application

If Using One Module,

Set Addresses To Off.

If Using Two Modules,

Set Addresses
Consecutively.

 


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Technical Guide

 

                     

Full Digital Module

7

Installation and Wiring

WARNING:   Be sure all controllers and modules are 

 

powered down before connecting or

 

disconnecting HSSC cables.

Figure 4, cont.:  VCM-X E-BUS Controller to Full Digital Module Wiring Diagram

Line Voltage

All Comm Loop Wiring Is

Straight Thru

24VAC

GND

Local Loop

RS-485

9600 Baud

See Individual

Component Wiring

Diagrams For

Detailed Wiring Of
Analog Inputs And

For Stand Alone Applications,

Connect To System Manager. For Network

Applications Connect To Next Controller

And/Or MiniLink PD On Local Loop.

G - Fan ON/OFF  Only

R - 24VAC

Relay Output Contacts
R2 Through R5 May Be User-Configured
For The Following:
1 - Heating Stages
2 - Cooling Stages
3 - Warm-up Mode Command  (VAV Boxes)
4 - Reversing Valve (Air To Air Heat Pumps)
5 - Reheat Control (Dehumidification)
6 - Exhaust Fan Interlock
7 - Preheater For Low Ambient Protection
8 - Alarm
9 - Override
10 - Occupied
11 - OA Damper
12 - Heat Wheel
13 - Emergency Heat
Note: 1.) When Using the HP2C Module,
All Compressors Will Be Wired From the
Protection Module, Not the VCM-X Controller.
Note: A Total Of 20 Relays Are Available By
Adding Relay Expansion Modules. All
Expansion Module Relay Outputs Are User
Configurable As Listed Above.

Connect FRP Tubing To High Pressure
Port  (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere

OE271

Static Pressure

Transducer

Splice If Required

Connect To
Expansion Module(s)
(When Used)

Connect To Digital Room Sensor And/Or
Digital CO Sensor

2

Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.

T to T, R to R & SHLD to SHLD

Size Transformer For Correct
Total Load.
VCM-X Modular Controller = 8

OE332-23E-VCMX-MOD-A

VCM-X Modular

E-BUS Controller

Note:
All Relay Outputs Are Normally Open And
Rated For 24 VAC Power Only.
1 Amp Maximum Load.

AI1 SET

AI2 SET

AI3 SET

AI4 SET

AI5 SET

AI7 SET

Jumpers

HSSC Cable Connect To

VCM-X E-BUS Port

RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC

RS-485 COMMUNICATION LOOP. WIRE
“R” TO “R”, “T” TO “T” “SHLD” TO “SHLD”

FAN

RELAY 2

RELAY 3

RELAY 4

RELAY 5

RELAY
COMMON

IC DIGITAL

SENSOR

2

IC

EXPANSION

2

STATIC

PRESSURE

ANALOG INPUT JUMPER SETTINGS
MUST BE SET AS SHOWN FOR
PROPER OPERATION

24 VAC POWER ONLY

WARNING! POLARITY MUST BE OBSERVED

OR THE CONTROLLER WILL BE DAMAGED

AI1

AI2

AI3

AI4

THERM

THERM

THERM

THERM

THERM

THERM

4-20mA

4-20mA

4-20mA

4-20mA

4-20mA

4-20mA

0-10V

0-10V

0-10V

0-10V

0-10V

0-10V

0-5V

0-5V

0-5V

0-5V

0-5V

0-5V

AI5

AI7

ANALOG INPUT

JUMPER

SETTINGS

WattMaster Label
#LB102073-01-A

Rev.: 1A

www.aaon.com

www.orioncontrols.com

VCM-X MODULAR E-BUS CONTROLLER

Orion No.:OE332-23E-VCMX-MOD-A

AAON No.:

V07150

AI1 = SPC (SPACE TEMPERATURE SENSOR)

AI2

AI3

AI4

AI5

AI7

A01

A02

= SAT (SUPPLY AIR TEMPERATURE SENSOR)
= RAT (RETURN AIR TEMPERATURE SENSOR)
= OAT (OUTDOOR AIR TEMPERATURE SENSOR)
= SUCTION PRESSURE SENSOR (FROM EXP. MODULE)
= SPACE TEMPERATURE SENSOR SLIDE ADJUST

OR VOLTAGE RESET SOURCE

= ECONOMIZER (2-10 VDC  OUTPUT)
= SUPPLY FAN VFD (0-10 VDC  OUTPUT)

LED BLINK CODES

LED NAME

STATUS1 STATUS2

NORMAL OPERATION

0

1

SAT FAIL

1

2

OAT FAIL

2

2

SPC FAIL

3

2

MODULE ALARM

4

2

MECH COOL FAIL

1

3

MECH HEAT FAIL

2

3

FAN PROOF FAIL

3

3

DIRTY FILTER

4

3

EMERGENCY SHUTDOWN

5

3

LOW SAT

1

4

HIGH SAT

2

4

CONT. TEMP COOL FAIL

3

4

CONT. TEMP HEAT FAIL

4

4

PUSH BUTTON OVR

1

5

ZONE OVR

2

5

OUTPUT FORCE ACTIVE

0

6

E-BUS

CONNECTOR

 


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Full Digital Module

Technical Guide

8

Start Up and Commissioning

General

In order to have a trouble free start-up, it is important to follow a few 
simple procedures. Before applying power for the fi rst time, it is very 
important to run through a few simple checks.

One of the most important checks to make before powering up the system 
for the fi rst time is to make sure that the VCM-X Modular or VCM-X 
Modular E-BUS Controller is confi gured properly for your application. 
Refer to the VCM-X Controller Technical Guide or VCM-X Modular 
E-BUS Controller Technical Guide 
for more information. A handheld 
Modular Service Tool, Modular System Manager, or System Manager 
Touch Screen connected to the VCM-X Modular or VCM-X Modular 
E-BUS Controller  will allow you to confi gure your application. Refer to 
the VCM-X / RNE Operator’s Interfaces SD Technical Guide or System 
Manager TS II Technical Guide
 for more information.

Check all wiring leads at the terminal block for tightness. Be sure that 
wire strands do not stick out and touch adjacent terminals. Confi rm 
that all sensors required for your system are mounted in the appropriate 
location and wired into the correct terminals.

WARNING:    Observe polarity! All boards must be wired 

 

GND-to-GND and 24 VAC-to-VAC. Failure to 

 

observe polarity could result in damage to the 

 boards.

 

Table 1:  Unit Confi gurations Chart

UNIT CONFIGURATIONS

PERMUTATION

SYSTEM A

SYSTEM B

HARDWARE

VCM-X WSHP 

CONFIGURATION

Comp A1

Comp A2 Comp B1

Comp B2

Relay 1

Relay 2

Relay 3

Relay 4

1

On/Off

On/Off

Use VCM-X Modular 

Series Controller Only

2 Compressors

2

Digital

On/Off

Use VCM-X Modular 

Series Controller Only

2 Compressors
Digital Compressor

3

Digital

Digital

Use VCM-X Modular 

Series Controller and 

Full Digital Module

2 Compressors
Full Digital

4

On/Off

On/Off

On/Off

On/Off

Use VCM-X Modular 

Series Controller Only

4 Compressors

5

Digital

On/Off

On/Off

On/Off

Not Available

Not Available

6

Digital

On/Off

Digital

On/Off

Use VCM-X Modular 

Series Controller Only

4 Compressors
Digital Compressor

7

Digital

Digital

Digital

Digital

Use VCM-X Modular 

Series Controller and 

Full Digital Module

4 Compressors
Full Digital

In the Cooling Mode, the Compressors will stage in the following order:

Permutations 1, 2 & 3:  Compressor A1 -> Compressor A2
Permutations 4:  Compressor A1 -> Compressor A2 -> Compressor B1 -> Compressor B2
Permutations 6:  Compressor A1 & Compressor A2 -> Compressor B1 -> Compressor B2
Permutations 7:  Compressor A1 & Compressor A2 -> Compressor B1 & Compressor B2

In the Dehumidifi cation Mode, the Compressors will stage in the following order:

Permutation 4:  Compressor A1 & Compressor A2 -> Compressor B1 -> Compressor B2

All other permutations in the Dehumidifi cation Mode stage as described in the Cooling Mode.

 


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Technical Guide

 

                     

Full Digital Module

9

Modes of Operation

 

NOTE:  See Unit Confi gurations Chart on page 10 for more 

information about compressor staging.

Digital Stage 1 / Digital Stage 2

On units with two Digital Scroll Compressors, the fi rst compressor (A1) 
will be designated as Digital Stage 1 and the second compressor (A2) 
will be designated as Digital Stage 2.

On units with four Digital Scroll Compressors, there may be instances 
where compressor numbers on the module do not correlate with the 
mechanical compressors’ numbers. Therefore, Digital Stage 1 refers to 
the fi rst set of Digital Scroll Compressors (A1/B1) that will stage on 
together and Digital Stage 2 refers to the second set of Digital Scroll 
Compressors (A2/B2) that will stage on together. Please refer to AAON’s 
wiring diagram for specifi c wiring of the unit.

Off Mode

The Full Digital Module will be in the Off Mode when no signal is 
being received from the VCM-X Modular series controller to run the 
compressors.

Cooling Mode

When a Cool Signal is received, the Full Digital Module will go into 
Cooling Mode. At this point, Compressor A1 (and B1*) will energize and 
Digital Stage 1 Analog Output will modulate as necessary to maintain 
the Supply Air Temperature at the Active Supply Air Setpoint that is 
broadcast from the VCM-X Modular series controller. 

When Digital Stage 1 reaches 100%, a stage up timer is started. If Digital 
Stage 1 stays at 100% for the Stage Up timer, Compressor A2 (and B2*) 
will energize and both Digital Stage 1 and Digital Stage 2 outputs will 
go to 50% and begin to modulate together. 

If both systems are energized and they go below 30% and the Supply Air 
is below the Supply Air Setpoint by the Cooling Stage Window value, 
the stage down timer is started. If the systems remain below 30% for 
the duration of the stage down timer, Digital Stage 2 will deactivate and 
Digital Stage 1 will  go to 60%.  Digital Stage 1 will stage down if it is 
at 0% for the duration of the stage down timer.

* If confi gured for 4 modulating compressors.

Heat Pump Heating Mode (Air to Air)

Heating Mode works the same as Cooling Mode except the Reversing 
Valve is switched and the sequence is opposite. Compressors modulate 
up when below the Heating Supply Air Setpoint and modulate down 
when above the setpoint.

Dehumidifi cation Mode

In Dehumidifi cation Mode, compressors will be controlled to maintain 
the Suction Pressure Temperature Setpoint. Digital Stage 1—Com-
pressor A1 (and B1*) will modulate up to 100% before Digital Stage 
2—Compressor A2 (and B2*) can be energized.  When Digital Stage 2 
is energized, Digital Stage 1 will be locked at 100%.  

* If confi gured for 4 modulating compressors.

Defrost Mode

In Defrost Mode, if only Digital Stage 1 is energized, it will go to 100% 
and the reversing valve will deactivate. If both Digital Stage 1 & Digital 
Stage 2 are energized, they will both go to 100% and the reversing valve 
will be deactivated. The duration for Defrost Mode is determined by the 
VCM-X Modular series controller.

NOTE:  Defrost Mode is only available if a One Condenser or 

Two Condenser Head Pressure Module is installed.

Staging Delays

Staging Delays minimum run times and minimum off times are sent 
from the VCM-X Modular series controller. 

 


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Full Digital Module

Technical Guide

10

Using LEDs to Verify Operation

The Full Digital Module is equipped with LEDs that can be used to verify 
operation and perform troubleshooting. There are LEDs for communi-
cation, operation modes, and diagnostic codes. The module has seven 
LEDs—one used for power, one used for operation status, one used for 
alarms, and four used for the compressor relays. See Figure 5 for the 
LED locations. The LEDs associated with these inputs and outputs al-
low you to see what is active without using a voltmeter. The LEDs and 
their uses are as follows:



Status LEDs 

“COMM” - The COMM LED lights up to indicate Communications 
between the module and the VCM-X Modular series controller. If Com-
munications are established, the COMM LED will blink. 

“ALARM” - This is the diagnostic blink code LED. It will light up 
and blink out diagnostic codes. See Table 2 for Diagnostic Blink Code 
descriptions. The blink code descriptions are also located on the mod-
ule’s front cover.

No. of Blinks

Status

0

No Problems

1

Low Suction Pressure Compressor A1

2

Low Suction Pressure Compressor A2

3

Low Suction Pressure Compressor B1

4

Low Suction Pressure Compressor B2

5

Pressure Sensor A1 Not Detected

6

Pressure Sensor A2 Not Detected

7

Pressure Sensor B1 Not Detected

8

Pressure Sensor B2 Not Detected

9

No Communication

Table 2:   ALARM LED Blink Codes

Troubleshooting

“STAT” - This is the status blink code LED. It will light up and every 10 
seconds will blink the status mode that the module is currently operating 
under. See Table 3 for Status Blink Code code descriptions. The blink 
code descriptions are also located on the module’s front cover. 

No. of Blinks

Status

1

Off Mode

2

Cool Mode

3

Heat Mode

4

Dehumidify Mode

5

Defrost Mode

Table 3:   STAT LED Blink Codes

 


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Technical Guide

 

                     

Full Digital Module

11

Compressor LEDs

“R1” - This LED will light up when Compressor A1 is enabled and will 
stay lit as long as Compressor A1 is active.

“R2” - This LED will light up when Compressor A2 is enabled and will 
stay lit as long as Compressor A2 is active.

“R3” - This LED will light up when Compressor B1 is enabled and will 
stay lit as long as Compressor B1 is active.

“R4” - This LED will light up when Compressor B2 is enabled and will 
stay lit as long as Compressor B2 is active.

SERIA

L

#

D3

D4

R11

R12

R28

R29

R30

D12

D13

R53

R54

TB3

C20

R34

R

50

SW2

4751

4751

4751

4751

OF
F

OP

T

ION
S

ALARM

STAT

COMM

1002

1002

1002

1002

RELAYS

ANALOG

R1

R2

R3

R4

Rc

AO1

AO2

GND

PWM1-

PWM1+

PWM2-

PWM2+

.01uF



‚

Figure 5:  LED Locations

Troubleshooting

 


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Full Digital Module

Technical Guide

12

LED Diagnostics

“PWR” LED: When the Full Digital Module is powered up, the PWR 
LED (located below the address switches) should light up and stay on 
continuously. If it does not light up, check to be sure that the power wir-
ing is connected to the board, the connections are tight, and the VCM-X 
Modular series controller is powered. If after making all these checks, 
the PWR LED does not light up, the module is probably defective.

“COMM” LED:  The COMM LED lights up to indicate Communica-
tions between the module and the VCM-X Modular series controller. If 
the COMM LED does not blink, then communications have not been 
established. Check the connection between the VCM-X Modular Con-
troller, the VCM-X Modular E-BUS Controller, the E-BUS Distribution 
Module, and the Full Digital Module. 

“STAT” LED: As previously described, this LED will blink out the 
operation mode that the Full Digital Module is operating under. When 
the board is fi rst powered up, the STAT LED will do the following:



Light up



Blink out status code every ten seconds to indicate

 controller 

status

“ALARM” LED: As previously described, this LED will blink on and 
off to indicate alarms and diagnostics.

Troubleshooting

Other Checks

NOTE:  The Full Digital Module contains no user-serviceable 

parts. Contact qualified technical personnel if your 
module is not operating correctly.

 


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Technical Guide

 

                     

Full Digital Module

13

Troubleshooting

OE275-01 Suction Pressure Transducer 

Testing for R410A Refrigerant

The Evaporator Coil Temperature is calculated by converting the Suc-
tion Pressure to Temperature. The Suction Pressure is obtained by using 
the OE275-01 Suction Pressure Transducer, which is connected into the 
Suction Line of the Compressor. 

Use the voltage column to check the Suction Pressure Transducer while 
connected to the Full Digital Module. Read voltage with a meter set on 
DC volts. If the temperature/voltage or pressure/voltage readings do 
not align closely with the chart, your Suction Pressure Transducer is 
probably defective and will need to be replaced.

See the OE275-01 Suction Pressure Transducer, Pressure, Temperature, 
and Voltage Chart for R410A Refrigerant testing (Table 4). The chart 
shows a temperature range from 20°F to 80°F. For troubleshooting pur-
poses, the DC Voltage readings are also listed with their corresponding 
temperatures and pressures. 

    

Table 4:  Coil Pressure/Voltage/Temp for OE275-01 
Suction Pressure Transducers - R410A Refrigerant

OE275-01 Suction Pressure Transducer Coil Pressure

– Temperature – Voltage Chart for R410A Refrigerant

Temperature 

°F

Pressure 

PSI

Signal

DC V

olts

Temperature

 

°F

Pressure 

PSI

Signal

DC V

olts

21.19

80.94

1.8

59.03

168.10

3.2

24.49

87.16

1.9

61.17

174.32

3.3

27.80

93.39

2.0

63.19

180.55

3.4

30.99

99.62

2.1

65.21

186.78

3.5

33.89

105.84

2.2

67.23

193.00

3.6

36.80

112.07

2.3

69.24

199.23

3.7

39.71

118.29

2.4

71.15

205.46

3.8

42.30

124.52

2.5

72.95

211.68

3.9

44.85

130.75

2.6

74.76

217.91

4.0

47.39

136.97

2.7

76.57

224.14

4.1

49.94

143.2

2.8

78.37

230.36

4.2

52.23

149.42

2.9

80.18

236.59

4.3

54.50

155.65

3.0

56.76

161.88

3.1

 


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Full Digital Module

Technical Guide

14

Connect To

E-BUS

Distribution

Module

Line Voltage

24 VAC

GND

Line Voltage

All Comm Loop Wiring Is

Straight Thru

24VAC

GND

Local Loop

RS-485

9600 Baud

See Individual Component

Wiring Diagrams For

Detailed Wiring Of Analog

Inputs And Outputs

For Stand Alone Applications,
Connect To System Manager.

For Network Applications

Connect To Next Controller

And/Or MiniLink PD On Local Loop.

G - Fan ON/OFF  Only

R - 24VAC

Relay Output Contacts
R2 Through R5 May Be User-Configured
For The Following:
1 - Heating Stages
2 - See Note 1 Below
3 - Warm-up Mode Command (VAV Boxes)
4 - Reversing Valve (Air To Air Heat Pumps)
5 - Reheat Control (Dehumidification)
6 - Exhaust Fan Interlock
7 - Preheater For Low Ambient Protection
8 - Alarm
9 - Override
10 - Occupied
11 - OA Damper
12 - Heat Wheel
13 - Emergency Heat
Note: 1.) When Using the HP2C Module,
All Compressors Will Be Wired From the
Protection Module, Not the VCM-X
Controller.
2.) A Total Of 20 Relays Are Available By
Adding Relay Expansion Modules. All
Expansion Module Relay Outputs Are User-
Configurable As Listed Above.

Connect FRP Tubing To High Pressure
Port  (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere

OE271

Static Pressure

Transducer

Splice If Required

Connect To E-BUS Distribution Module
or Expansion Module(s) (When Used)

Connect To Digital Room Sensor And/Or
Digital CO Sensor

2

Warning:
24 VAC Must Be Connected So That All Ground
Wires Remain Common. Failure To Do So Will
Result In Damage To The Controllers.

T to T, R to R & SHLD to SHLD

Size Transformer For
Correct Total Load.
VCM-X Modular Controller
= 8 VA

OE332-23-VCMX-MOD-A

VCM-X Modular Controller

Note:
All Relay Outputs Are Normally Open And Rated
For 24 VAC Power Only.
1 Amp Maximum Load.

AI1

AI1 SET

AI2 SET

AI3 SET

AI4 SET

AI5 SET

AI7 SET

AI2

AI3

AI4

AI5

AI7

AI1 SET

AI2 SET

AI3 SET

AI4 SET

AI5 SET

AI7 SET

Jumpers

Figure 6:  VCM-X Modular Controller Connection to Full Digital Module

Appendix

VCM-X Modular Controller to Full 

Digital Module Wiring

When using the VCM-X Modular Controller, the E-BUS Distribution 
Module is required ot connect to the Full Digital Module. The Full Digital 
Module connects to the E-BUS Distribution Module using a modular 
HSSC cable. The Full Digital Module requires a 24 VAC power con-
nection with an appropriate VA rating.

The E-BUS Distribution Module connects to the VCM-X Modular 
Controller, VCM-X Expansion Module, or 12 Relay Expansion Module 
using the I

2

C port. See Figure 6 below for wiring. 

Any E-BUS module can be connected to each of the four E-BUS

 

Dis-

tribution Module’s output ports or can be daisy-chained together using 
HSSC cables. 

If using a spliced terminal connection for longer runs, one module can be 
connected to the E-BUS Distribution Module and any additional modules 
would be daisy-chained to the fi rst module. For more information, refer 
to the E-BUS Distribution Module Technical Guide.

 


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Technical Guide

 

                     

Full Digital Module

15

Appendix

NOTE:  Contact Factory for the correct HSSC cable length for 

your application. Cables are available in ½ and 3 meter 
lengths and 100 and 150 foot lengths.

WARNING:   Be sure all controllers and modules are 

 

powered down before connecting or

 

disconnecting HSSC cables.

Figure 6:  VCM-X Modular Controller Connection to Full Digital Module

WARNING!!
Observe Polarity! All
boards must be wired with
GND-to-GND and 24 VAC-
to-24 VAC. Failure to
observe polarity could
result in damage to the
boards.

OE365-23-EBD E-BUS

Distribution Module

GND

-COMM

SHLD

+COMM

INPUT

+COMM

SHLD

-COMM

GND

+VDC

485 DRV

24VAC

GND

PWR

YS102308
REV 1
I2C TO COMM
DIST. BOARD

OUTPUT

Modular Cable

Connect To

VCM-X Modular Controller

HSSC Cable

Connect To E-BUS

Distribution Module

Connect To Other

WattMaster-Approved

E-BUS Expansion Module(s)

OE370-23-FD-A

Full Digital Module

+5V

SIG 2

GND

OPTI

O

N

S

ALARM

ANALOG

STAT

+5V

COMM

GND

SIG 4

GND

BIN 2

R1

R2

GND

RELAYS

ADDRESS

SIG 3

+5V

GND

BIN 1

COM

+5V

SIG 1

R3

R4

Rc

AO1

AO2

PWM1-

PWM1+

PWM2-

PWM2+

PWR

HSSC Cable

24 VAC Transformer

3 VA Minimum

Line Voltage

24 V

A

C

GND

WARNING!!
Observe Polarity! All boards must
be wired with GND-to-GND and 24
VAC-to-24 VAC. Failure to observe
polarity could result in damage to
the boards.

If Using One

Module, Set

Addresses To

Off. If Using

Two Modules,

Set Addresses
Consecutively.

This Dip

Switch Is Not

Used For This

Application

 


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Ph: (918) 583-2266 • Fax: (918) 583-6094

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®

 Manual Part No. R84500

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