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Tekmar D 315 User Manual

Made by: Tekmar
Type: User Guide
Category: Heating System
Pages: 12
Size: 1.08 MB

 

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1 of 12

© 2011  

D 315 - 04/11

tN4 Wiring Center 315

D 315

04/11

Zoning

Replaces: 04/09

Installation & Operation Manual

Benefi ts

Simple, convenient wiring location
Compact enclosure for flexible installation
Reduce equipment cycling when combined with 
tekmarNet

®

4 Thermostats



The tekmarNet

®

4 (tN4) Wiring Center 315 is designed to 

operate up to six zone valves in a hydronic heating system. 
It can be mounted near a remote zone manifold, providing a 
convenient location to wire both thermostats and zone valves 
while only requiring two wires to be run back to the mechanical 
room. When combined with tekmarNet

®

4 Thermostats, all 

devices communicate to provide a synchronized end switch 
that reduces cycling of equipment. A zone group pump 
relay is also available to switch a pump.

Features

Six 24 V (ac) powered zone outputs
For use with tekmarNet

®

4 Thermostats

tN4 expansion terminals
Isolated end switch
Zone group pump relay
External diagnostic LEDs
CSA C US Certified for use in USA and Canada







Introduction

Power

Zone 1

Zone 2

Zone 3

Zone 4

Zone 5

Zone 6

End Switch/ Zone Group Pump

tN4 Wiring Center 315

Six Zone Valves

 

Note

Not for use with tekmarNet

®

2 Thermostats

 


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© 2011

D 315 - 04/11

2 of 12

 Table of Contents 

 Getting Started 

  

 Caution 

   

Installation ......................................................................2

Preparation .................................................................2
Physical Dimensions ..................................................3
Installation Location ...................................................3
Rough-In Wiring .........................................................3
Sizing the Transformer ...............................................4
Control Wiring ............................................................4
Testing the Control Wiring ..........................................6

Applications ....................................................................7

User Interface ............................................................... 10

LEDs ........................................................................ 10

Sequence of Operation ................................................ 10

tekmarNet

®

 System .................................................. 10

Relay Outputs ........................................................... 11
Energy Saving Features ........................................... 11

Troubleshooting ............................................................ 11

Frequently Asked Questions .................................... 11

Technical Data .............................................................. 12

Limited Warranty and Product Return Procedure ........ 12

Congratulations on the purchase of your new tekmarNet

® 

Wiring Center!

This manual covers the complete installation, programming and sequence of operation for this control. You will also find 
instruction on testing, commissioning, and troubleshooting the control and system that it operates. 

Improper installation and operation of this control could 
result in damage to the equipment and possibly even 
personal injury or death. It is your responsibility to ensure 
that this control is safely installed according to all applicable 
codes and standards. This electronic control is not intended 
for use as a primary limit control. Other controls that are 
intended and certified as safety limits must be placed into 

the control circuit. Do not attempt to service the control. 
Refer to qualified personnel for servicing. There are no 
user serviceable parts. Attempting to do so voids warranty 
and could result in damage to the equipment and possibly 
even personal injury or death.

Installation

The installer must ensure that this control and its wiring are 
isolated and/or shielded from strong sources of electromagnetic 
noise. Conversely, this Class B digital apparatus complies 
with Part 15 of the FCC Rules and meets all requirements of 
the Canadian Interference-Causing Equipment Regulations. 
However, if this control does cause harmful interference 
to radio or television reception, which is determined by 
turning the control off and on, the user is encouraged to try 

to correct the interference by re-orientating or relocating 
the receiving antenna, relocating the receiver with respect 
to this control, and/or connecting the control to a different 
circuit from that to which the receiver is connected.

Cet appareil numérique de la classe B respecte toutes 
les exigences du Règlement sur le matériel brouilleur du 
Canada.

 Radio Frequency Interference 

Preparation

Tools Required

 ---------------------------------------------------------------------------------------

 ---------------------------------------------------------------------------------------

tekmar or jeweller screwdriver
Phillips head screwdriver


Needle-nose pliers
Wire stripper


Materials Required

 -----------------------------------------------------------------------------------

 -----------------------------------------------------------------------------------

(2) #10 x 1” wood screws
(2) wire nuts
18 AWG LVT solid wire (low voltage connections)



14 AWG solid wire (line voltage connections)
tekmar 009 (24 V (ac) transformer)
Cable or conduit connectors



Power Required

 --------------------------------------------------------------------------------------

 --------------------------------------------------------------------------------------

120 V (ac), 1-phase, 15 A service from circuit breaker 
panel

Power disconnect (optional)

 


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© 2011  

D 315 - 04/11

Installation Location

When choosing the location for the control, consider the 
following:
Keep dry. Avoid potential leakage onto the control.
RH   90% to 122°F (50°C) in a non-condensing 
environment.
Do not expose to operating temperatures beyond 32-
122°F (0-50°C).
Provide adequate ventilation.
Keep away from equipment, appliances or other sources 
of electrical interference.


Locate the control near zone valves if possible.
Provide easy access for wiring and viewing the 
control.
Mount approximately 5 ft. (1.5 m) off the finished floor.
Install to wall using #10 x 1” wood screws. Wall anchors 
are recommended when mounting to sheet rock, wall-
board or masonry.



Rough-In Wiring

Line Voltage Wiring

-----------------------------------------------------------------------------------

-----------------------------------------------------------------------------------

In most cases, the control can be mounted directly to a wall 
without the need for any line voltage connections.

As an option, the control may be mounted to a 4” x 4” 
electrical junction box so that the high voltage electrical 
connections for the transformer are safely contained.

For ease of service, the circuit breaker or power disconnect 
should be located in reasonably close proximity to the 
equipment.

All line voltage wire connections are recommended to 
be pulled inside a flexible or solid conduit. Always follow 
proper wiring practices, building and electrical codes for 
your jurisdiction. 

Each cable must be pulled to the electrical junction box. It 
is recommended to label each cable for easy identification. 
All line voltage wires should be stripped to a length of 1/2” 
(13 mm).

Pull a three conductor 14 AWG cable for the following 
equipment:

Circuit Breaker or Power Disconnect (if applicable)
Zone Group Pump (if applicable)


Physical Dimensions

5–1/2”

(140 mm)

5–1/2”

(140 mm)

1–1/8” (30 mm)

7/8”

(22 mm)

CL

Front View

1/2” Knock-out (x 4)

31

5

Zone P

ow

er L

Zone Gr

oup Pump

Strip wir

es1/2 inch (1

3 mm).

Ins
talled wir

es ar

e no

t r

emo

vable.

12

-1

8 A
W

G

Ø 1/8” (3 mm)

7/8” x 1/2” (23 mm x 12 mm)

Knock-out (x 4)

1/2” x 5/8”

(12 mm x 16 mm)

Knock-out (x 4)

2–1/4”

(57 mm)

Power

Zone 1

Zone 2

Zone 3

Zone 4

Zone 5

Zone 6

End Switch/ Zone Group Pump

C
Zone 2

W

tN4

R

C
Zone 3

W

tN4

R

C
Zone 4

W

tN4

R

tN4 Wiring Center 315

Six Zone Valves

 

W

tN4

Ct

N

4

CX

Zone 1

Expansion

Vlv

C

Zone 1

Vlv

C

Zone 2

Vlv

C

Zone 3

Vlv

C

Zone 4

Vlv

C

Zone 5

Vlv

C

Zone 6

XC

Input P

ow

er

R

R

Wt

N

4

C

Zone 5

R

Wt

N

4

C

Zone 6

R

H8001B

End Switch

Use at leas

t 1

67°F

(7

5°C) conduct

ors

Side View

Back View

 


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© 2011

D 315 - 04/11

4 of 12

The control requires an external transformer. A tekmar 
Transformer 009 (or 009K which includes a 4”x 4” electrical 
box) can supply up to 40 VA, and includes an in-line fuse 
to protect the transformer and control.
In order to correctly size the external transformer, all loads 
connected to the control must be taken into account. 
When adding up the loads, consider the following:

tekmarNet

®

4 Thermostats draw approximately 2 VA each.

Each zone valve must be sized for peak load. This can be 
obtained by multiplying the peak current draw (in Amps) 
by 24 V (ac).


The total power capacity of the power supply should be 
larger than the total load of all the devices connected to 
the control. This total load must not exceed 98 VA. Multiple 
tekmar Transformer 009’s can be wired together to increase 
total VA capacity. 

The following chart is provided to simplify transformer 
sizing:

Zone

1

2

3

4

5

6

Thermostat Load

Zone Valve Load

Control 

Load (VA)

Total Zone Load

+

+

+

+

+

+

3

Transformer 

must exceed:

VA

Sizing the Transformer

Control Wiring

Line Voltage Wiring

-----------------------------------------------------------------------------------

-----------------------------------------------------------------------------------

Wire the Grounds

Connect the power supply ground and zone group pump 
ground to the electrical box as shown in Figure 1.

Wire the Neutrals (N)

Connect the 115 V (ac) neutral (N) and zone group pump 
neutral wires to the 115 V (ac) side of the transformer. Use 
a wire nut or approved connector. See Figure 1.

Wire the Power (L)

Connect the 115 V (ac) line voltage (L) wire to the 115 V 
(ac) side of the transformer and to the Power L wire (red) 
of the zone group pump relay. Use a wire nut or approved 
connector. See Figure 1.

Wire the Zone Group Pump (L)

Connect the 115 V (ac) line voltage (L) wire from the 
zone group pump to the Zone Group Pump push-in wire 
connector. See Figure 1.
If the zone group pump is not used, then cut the rear red 
and black wires where they exit the enclosure.

CAUTION: TURN ALL POWER OFF BEFORE PERFORMING ANY WIRING.

Each cable must be pulled from the equipment to the 
control’s plastic enclosure. All low voltage wiring connections 
enter the enclosure through conduit knockouts on the 
sides, or through the square knockouts on the rear. It is 
recommended to label each cable for easy identification. 
All low voltage wires are to be stripped to a length of 3/8” 
(9 mm) to ensure proper connection to the control.

Pull two conductor 18 AWG LVT cable, up to 500 feet 
(150 m) for the following equipment:

tekmarNet

®

4 Expansion (if applicable)

24 V (ac) Power


Zone Valves
Boiler T-T (If using End Switch)

Pull three conductor 18 AWG LVT cable, up to 500 feet 
(150 m) for the following equipment:

tekmarNet

®

4 Accessories (User Switch, Timer)

Pull four conductor 18 AWG LVT cable, up to 500 feet 
(150 m) for the following equipment:

tekmarNet

®

4 Thermostats


Low Voltage Wiring

 -----------------------------------------------------------------------------------

 -----------------------------------------------------------------------------------

 


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© 2011  

D 315 - 04/11

Power Source 

(L, N, Ground)

Zone Group 

Pump 

(L, N, Ground)

(red)

Figure 1 - Connect 
Line Voltage Wires

External Power Supply

It is strongly recommended that a transformer with an in-line 
fuse be used in order to protect the transformer from high 
currents. The tekmar Transformer 009 includes a fuse.

Connect the 24 V (ac) leads from the transformer to the C 
and R terminals marked “Input Power” on the 315.

tekmarNet

®

4 Thermostats 

The tN4 Wiring Center 315 is designed to operate with 
tekmarNet

®

4 Thermostats. They provide a synchronized 

end switch on the Wiring Center and communicate with 
any other tN4 device on the system. 

Connect the tN4, C, R and W terminals from each 
thermostat to the corresponding terminals for each 
zone on the Wiring Center.
Ensure the tN4 and C wires are not reversed.

Conventional Thermostats 

The tN4 Wiring Center 315 may be used with conventional 
and ‘power stealing’ type thermostats. However, the end 
switch synchronization feature will not be available.

Install the thermostat to the appropriate R and W ter-
minals on the 315.

Low Voltage Wiring

 -----------------------------------------------------------------------------------

 -----------------------------------------------------------------------------------

The enclosure may be mounted directly to a wall or to 
an electrical junction box.
Ensure that the high voltage wires are neatly tucked 
inside the electrical junction box.
Using 2 of the 4 holes in the back of the enclosure, securely 
fasten it to the electrical junction box with 2 #10 screws as 
shown in Figure 2.

Install The Enclosure

 ---------------------------------------------------------------------------------

 ---------------------------------------------------------------------------------

Figure 2

Important Note:

Do not mix tekmarNet

®

4 and conventional thermostats on 

the same wiring center. 

Zone Valves

Wire the zone valves to the C and Vlv terminals on the 315.
End switches on zone valves are not required when 
using the 315.

tN4 Expansion Terminals (tN4 thermostats only)

The 315 uses the Expansion tN4 and C terminals to communicate 
with additional Wiring Centers, House Controls, and other 
tekmarNet

®

 devices.

Connect the tN4 and C Expansion terminals on the 315 
to the corresponding tN4 and C Expansion terminals of 
the additional external device.

Wiring the End Switch

The 315 can operate a single on-off boiler or provide a 
demand to a tekmar control.

Connect the X X End Switch terminals on the 315 to the 
T-T (or R-W) terminals on the boiler.
If required, use the X X End Switch terminals to switch 
24 V (ac) to power a demand on a tekmar outdoor reset 
control.


 


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D 315 - 04/11

6 of 12

Testing the Control Wiring

Testing the Power 

 

-----------------------------

 

-----------------------------

If the control Power light does not turn on, check the Input 
Power wiring terminals using an electrical multimeter. The 
voltage should measure between 21.6 to 26.4 V (ac). If the 
voltage is below this range, measure the line voltage side 
of the transformer. The voltage should measure between 
103.5 to 126.5 V (ac).

Testing tekmarNet

®

4 Thermostats 

 ------------

 ------------

1.  To test the tN4 Network, check the tN4 and C wires for 

continuity.

Disconnect the tN4 and C wires from the tekmarNet

®

Wiring Center and twist them together.
Go to the thermostat and disconnect the tN4 and C 
wires.
Using an electrical test meter, check for continuity. 
If continuity exists, then proceed to next step, if not, 
verify that correct wires are in place prior to continu-
ing to next step.
Reconnect the wires to the proper terminals.

2.  To test the call for Heat (W), a continuity test is used 

between terminals R and W.

Disconnect the wire from terminal W on the 315.
When the thermostat calls for heat, the resistance be-
tween R and the disconnected W wire should be 0 
ohms or tone indicating continuity.
When there is no call for heat the resistance be-
tween R and W should be infinite, O.L. or no tone 
should be heard. 

Testing Conventional Thermostats 

 

------------

 

------------

To test the call for Heat (W), a continuity test is used 
between terminals R and W.

1.  Disconnect the wire from terminal W.
2.  When the thermostat calls for heat, the resistance 

between R and the disconnected W wire should be 
less than 7 ohms or tone indicating continuity.

3.  When there is no call for heat the resistance between 

R and the disconnected W wire should be infinite, O.L., 
or no tone should be heard. 

Testing Power-Stealing Thermostats 

 

----------

 

----------

The tN4 Wiring Center 315 can also accept ‘power-stealing’ 
type thermostats. They must output less than 5 V (ac) when 
not calling for heat, or the 315 may detect a false heat call 
and open the corresponding zone valve. 

1.  Connect the R & W wires from the thermostat to the 

desired zone R and W terminals on the 315. 

2.  When the thermostat is not calling for heat, the 

corresponding zone LED should not be lit.

If the zone LED is lit, then a resistor may have to be 
added to reduce the trickle voltage through the ther-
mostat. See the thermostat installation manual for 
details.


Testing the Zone Output 

 ----------------------

 ----------------------

1.  Use an electrical test meter to measure the (ac) voltage 

between the C and the Vlv terminals for each zone valve 
output.

Lower the thermostat temperature setting. When the 
zone LED is off, the reading should be 0 V (ac) and the 
valve should be closed.
Raise the thermostat temperature setting. When the 
zone LED is on, the reading should be 24 V (ac) + / – 
10% and the valve should be open.

Note:

 If power to the zone valve is present but the zone 

valve does not operate properly, refer to any troubleshooting 
information supplied by the zone valve manufacturer.

Testing tekmarNet

®

4 Expansion 

 --------------

 --------------

To test the tN4 Network, check the wires for continuity 
and shorts.

1.  Disconnect the two tN4 expansion wires (tN4 and C) 

at one end and twist them together.

2.  Go to the other end of the wires and disconnect 

them.

3.  Using an electrical test meter, check for continuity. 

Resistance should read 0 ohms, or continuity should 
produce a tone. If not, this indicates that there are 
damaged wires connecting the tN4 control to the 315. 
Repair or replace them as necessary.

4.  Go back to the original end of the wires and, using a 

wire nut, cap each expansion wire individually so that 
these ends cannot touch another conductor.

5.  Go to the other end of the wires and again, test for 

shorts. Resistance should be infinite, or O.L. and there 
should be no tone. If tone exists or less than 50 000 
ohms is found, then the wires are not insulated from 
one another. This is generating a short on the wires 
connecting the tN4 control to the tN4 Wiring Center.

6.  Replace the damaged wires, test, and reconnect them 

to their proper terminals.

Testing The End Switch / Zone Group Pump 

 --

 --

If the tN4 expansion terminals are not used to connect 
the tN4 Wiring Center to the system, the end switch may 
be used. 
1.  Remove the wires from the end switch terminals.
2.  Use an electrical test meter to measure continuity 

across the XX end switch terminals on the 315.

When the end switch LED is off, no continuity should 
be present (no tone).
When the end switch LED is on, continuity should be 
present (tone).

3. Use an electrical test meter to measure voltage across 

the zone group pump hot switch leg and neutral.

When the zone group pump LED is off, the voltage 
should be 0 V (ac).
When teh zone group pump LED is on, the voltage 
should be between 103.5 to 126.5 V (ac).

 


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© 2011  

D 315 - 04/11

Applications

R

C

L

N

Expansion

tN4

C

tN4

Power

Zone 1

Zone 2

Zone 3

Zone 4

Zone 5

Zone 6

End Switch/ Zone Group Pump

C

Zone 2

W

tN4

R

C

Zone 3

W

tN4

R

C

Zone 4

W

tN4

R

tN4 Wiring Center 315

Six Zone Valves

 

W

tN4

C

tN4

CX

Zone 1

Expansion

Vlv

C

Zone 1

Vlv

C

Zone 2

Vlv

C

Zone 3

Vlv

C

Zone 4

Vlv

C

Zone 5

Vlv

C

Zone 6

XC

Input P

ow

er

R

R

W

tN4

C

Zone 5

R

W

tN4

C

Zone 6

R

H8001B

End Switch

Use at leas

t 1

67°F

(7

5°C) conduct

ors

Description:

 tN4 Wiring Center 315, six tekmarNet

®

4 Thermostats, and six zone valves wired to a tekmar System Control 

420 and 335, which controls the boiler, primary pump and DHW pump and six other zones.

tekmarNet

®

4 Expansion to Building Control

A315-1

315

070

420

335

tekmarNet

®

4 Thermostats Required

24 V (ac)

Transformer 009

Zone Valves (Z1 to Z6)

External 

tekmarNet

®

4

Expansion to

Zone Manager, 

Reset Module, or 

House Control

Z1

Z2

Z3

Z4

tekmarNet

®

Thermostats

tekmarNet

®

Thermostats

Z5

Z6

 


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D 315 - 04/11

8 of 12

Description: 

tN4 Wiring Center 315, six tekmarNet

®

4 Thermostats, and six zone valves wired into a powered boiler demand 

input on a device such as a tekmar Boiler Control 260 which controls the primary pump and DHW pump.

R

C

L

N

Demand

Boiler

Power

Zone 1

Zone 2

Zone 3

Zone 4

Zone 5

Zone 6

End Switch/ Zone Group Pump

C

Zone 2

W

tN4

R

C

Zone 3

W

tN4

R

C

Zone 4

W

tN4

R

tN4 Wiring Center 315

Six Zone Valves

 

Wt

N

4

Ct

N

4

CX

Zone 1

Expansion

Vlv

C

Zone 1

Vlv

C

Zone 2

Vlv

C

Zone 3

Vlv

C

Zone 4

Vlv

C

Zone 5

Vlv

C

Zone 6

XC

Input P

ow

er

R

R

Wt

N

4

C

Zone 5

R

W

tN4

C

Zone 6

R

H8001B

End Switch

Use at leas

t 1

67°F

(7

5°C) conduct

ors

260

315

070

End Switch (X-X) To Powered Boiler Demand

A315-2

24 V (ac)

Transformer 009

Zone Valves (Z1 to Z6)

tekmarNet

®

4, or Conventional Thermostats

(Use tekmarNet

®

4 Thermostats to achieve better system performance)

Powered Boiler Demand

tekmarNet

®

4 Thermostats

Z1

Z2

Z3

Z4

Z5

Z6

 


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© 2011  

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Description: 

tN4 Wiring Center 315, six tekmarNet

®

4 Thermostats, and six zone valves wired into the T-T terminals on the 

boiler to give an enable. The pump is controlled by the Zone Group Pump output on the 315.

R

C

L

N

T

T

115 V (ac)

L

N

G

to pump grounds

N

L

(red)

(black)

315

Power L

Zone Group Pump

Power

Zone 1

Zone 2

Zone 3

Zone 4

Zone 5

Zone 6

End Switch/ Zone Group Pump

C

Zone 2

W

tN4

R

C

Zone 3

W

tN4

R

C

Zone 4

W

tN4

R

tN4 Wiring Center 315

Six Zone Valves

 

W

tN4

C

tN4

CX

Zone 1

Expansion

Vlv

C

Zone 1

Vlv

C

Zone 2

Vlv

C

Zone 3

Vlv

C

Zone 4

Vlv

C

Zone 5

Vlv

C

Zone 6

XC

Input P

ow

er

R

R

W

tN4

C

Zone 5

R

W

tN4

C

Zone 6

R

H8001B

End Switch

Use at leas

t 1

67°F

(7

5°C) conduct

ors

315

End Switch (X-X) To Boiler Enable (T-T)

A315-3

24 V (ac)

Transformer 009

Zone Valves (Z1 to Z6)

End Switch (X-X)

to boiler enable (T-T) 

Z1

Z2

Z3

Z4

tekmarNet

®

4 Thermostats

Z5

Z6

tekmarNet

®

4, or Conventional Thermostats

(Use tekmarNet

®

4 Thermostats to achieve better system performance)

 


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© 2011

D 315 - 04/11

10 of 12

Sequence of Operation

 tekmarNet

®

 System 

Section A

tekmarNet

®

 is a family of products that use communication 

to operate the HVAC system in a comfortable and efficient 
manner. The Wiring Center is a zoning component in 
a tekmarNet

®

 system and requires tekmarNet

®

4 (tN4) 

Thermostats to be directly connected to it.

The tekmarNet

®

4 (tN4) Expansion terminals can link the 

Wiring Center with other tekmarNet

®

 components:

House Controls 400, 401, 402, 403 - Provides boiler and 
DHW control

Reset Modules 420, 421, 422, 423
Boiler Controls 274, 275
Wiring Centers 313, 314, 315, 316 - Add additional zones
tN4 Thermostats - Add thermostats
tN4 Timer 033 - Adds 4 programmable schedules
tN4 User Switch 479 - Provides a system override for 
vacations and holidays
tN4 Setpoint Control 161, 162 - Control hot tubs, pools 
and more






ZONE 1

The zone 1 thermostat is calling for heat 
and the 24 V (ac) output is energized.

ZONE 2

The zone 2 thermostat is calling for heat 
and the 24 V (ac) output is energized.

ZONE 3

The zone 3 thermostat is calling for heat 
and the 24 V (ac) output is energized.

ZONE 4

The zone 4 thermostat is calling for heat 
and the 24 V (ac) output is energized.

ZONE 5

The zone 5 thermostat is calling for heat 
and the 24 V (ac) output is energized.

ZONE 6

The zone 6 thermostat is calling for heat 
and the 24 V (ac) output is energized.

POWER

24 V (ac) is being applied to the Wiring 
Center to provide it with power.

END SWITCH / ZONE GROUP PUMP

At least one of the zone thermostats are 
calling for heat and the end switch and zone 
group pump relay outputs are closed. 

LEDs

User Interface

Power

Zone 1

Zone 2

Zone 3

Zone 4

Zone 5

Zone 6

End Switch / Zone Group Pump

Wiring Center 315

 


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11 of 12

© 2011  

D 315 - 04/11

Relay Outputs

Section B

End Switch Operation

 -------------------------

 -------------------------

The End Switch relay (‘XX’) closes and the end switch 
LED turns on.  The switch remains closed as long as any 
zone is calling for heat. This can provide a boiler demand 
to a tekmar reset control, or provide a boiler enable to a 
boiler’s TT terminals. 

If the Wiring Center is connected to a tN4 bus, all 
communication messages will pass through the 315’s tN4 
expansion connection. tN4 messages are required in order 
to create a boiler demand on a device such as a tekmar 
House Control 400.

24 V (ac) Zone Relay Operation

 ----------------

 ----------------

When a thermostat calls for heat, it sends a message to 
the Wiring Center and the corresponding zone LED turns 
on. Power is then supplied to the appropriate zone output 
as indicated by the LED.

Zone Group Pump Operation

 ------------------

 ------------------

The zone group pump remains on when any zone is calling 
for heat. 

Network Schedules

----------------------------

----------------------------

Adding a schedule to a tekmarNet

®

 system is both easy 

and valuable. A Timer 033 provides scheduling with up to 
4 events per day for every tekmarNet

®

 Thermostat. Turning 

down the room temperatures when they are unoccupied 
reduces boiler on-time and energy consumption which 
helps save money and the environment.

One-Touch Economy

 --------------------------

 --------------------------

A User Switch 479 allows for one-touch overrides of the 
system.  For example, if leaving the building for vacation, 
simply press the “Away” button and all the thermostats 
will immediately operate at a lower temperature, instead 
of having to walk around the building lowering the heating 

 Energy Saving Features 

Section C

temperature setting and raising the cooling temperature 
setting on each thermostat.

Zone Synchronization

 -------------------------

 -------------------------

Another feature of the Wiring Center is Zone Synchronization. 
In typical zoned systems, the thermostats operate on a 
stand-alone basis. This means that a zone turns on and off 
as required without any regard for other zones. The net effect 
is random operation of the zones causing short cycling of 
the heat source. tekmarNet

®

 thermostats communicate to 

ensure that their cycles are synchronized. Energy is saved 
by ensuring zones requiring heat operate on the same cycle, 
therefore reducing short cycling of the boiler.

Symptom

Look For...

Corrective Action

Power LED is off Power to control

Use electrical meter to measure 24 V (ac) voltage on input power R and C 
terminals.

No central 
heating

Zone LEDs

If there are no green Zone LEDs, there are no thermostats calling for heat.

System in AWAY

During AWAY, the thermostats operate at a lower temperature. Locate a ‘User 
Switch’ and set to Normal to resume heating.

Single zone over 
heating

LED shows zone on

Thermostats have a differential of +/- 1.5°F (0.8°C) of the temperature setting. 
Due to the display rounding numbers up, heating can appear on when the 
temperature is 2°F (1.1°C) above the setting. This is normal operation.

LED shows zone off

Ensure zone valve terminals measure 0 V (ac). Measuring 0 V (ac) indicates 
mechanical zone valve may have failed in the open position. Measuring 24 V 
(ac) indicates control relay may have failed.

Single zone under 
heating

LED shows zone on

Ensure zone valve terminals measure 24 V (ac). Measuring 24 V (ac) indicates 
mechanical zone valve may have failed in the closed position. Measuring 0 V 
(ac) indicates control relay may have failed.

LED shows zone off

Check the thermostat to see if it is calling for heat (H1 displayed on the screen). 

 Frequently Asked Questions 

Troubleshooting

 


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Product design, software and literature are Copyright © 2011 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.

12 of 12

All specifications are subject to change without notice.

Printed in Canada. D 315 - 04/11.

tekmar Control Systems Ltd., Canada, tekmar Control Systems, Inc., U.S.A. 

Head Offi ce: 5100 Silver Star Road, 

Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. 250-545-0650  Web Site: www.tekmarcontrols.com

Limited Warranty 

The liability of tekmar under this warranty is lim-

ited. The Purchaser, by taking receipt of any tekmar product (“Prod-
uct”), acknowledges the terms of the Limited Warranty in effect at 
the time of such Product sale and acknowledges that it has read 
and understands same.

The tekmar Limited Warranty to the Purchaser on the Products sold 
hereunder is a manufacturer’s pass-through warranty which the 
Purchaser is authorized to pass through to its customers. Under 
the Limited Warranty, each tekmar Product is warranted against 
defects in workmanship and materials if the Product is installed and 
used in compliance with tekmar’s instructions, ordinary wear and 
tear excepted. The pass-through warranty period is for a period of 
twenty-four (24) months from the production date if the Product is 
not installed during that period, or twelve (12) months from the docu-
mented date of installation if installed within twenty-four (24) months 
from the production date.

The liability of tekmar under the Limited Warranty shall be limited to, at 
tekmar’s sole discretion: the cost of parts and labor provided by tekmar 
to repair defects in materials and/or workmanship of the defective prod-
uct; or to the exchange of the defective product for a warranty replace-
ment product; or to the granting of credit limited to the original cost of the 
defective product, and such repair, exchange or credit shall be the sole 
remedy available from tekmar, and, without limiting the foregoing in any 
way,  tekmar  is  not  responsible,  in  contract,  tort  or  strict  product  liabil-
ity, for any other losses, costs, expenses, inconveniences, or damages, 
whether direct, indirect, special, secondary, incidental or consequential, 
arising from ownership or use of the product, or from defects in work-
manship or materials, including any liability for fundamental breach of 
contract.

The pass-through Limited Warranty applies only to those defective Prod-
ucts  returned  to  tekmar  during  the  warranty  period.  This  Limited  War-
ranty does not cover the cost of the parts or labor to remove or transport 
the defective Product, or to reinstall the repaired or replacement Product, 
all such costs and expenses being subject to Purchaser’s agreement and 
warranty with its customers.

Any representations or warranties about the Products made by Purchaser 
to its customers which are different from or in excess of the tekmar Lim-
ited Warranty are the Purchaser’s sole responsibility and obligation. Pur-
chaser shall indemnify and hold tekmar harmless from and against any 
and all claims, liabilities and damages of any kind or nature which arise 
out of or are related to any such representations or warranties by Pur-
chaser to its customers.

The pass-through Limited Warranty does not apply if the returned Prod-
uct has been damaged by negligence by persons other than tekmar, 
accident, fire, Act of God, abuse or misuse; or has been damaged by 
modifications, alterations or attachments made subsequent to purchase 
which have not been authorized by tekmar; or if the Product was not 
installed in compliance with tekmar’s instructions and/or the local codes 
and ordinances; or if due to defective installation of the Product; or if the 
Product was not used in compliance with tekmar’s instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS 
OR IMPLIED, WHICH THE GOVERNING LAW ALLOWS PARTIES TO 
CONTRACTUALLY EXCLUDE, INCLUDING, WITHOUT LIMITATION, 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
A PARTICULAR PURPOSE, DURABILITY OR DESCRIPTION OF THE 
PRODUCT, ITS NON-INFRINGEMENT OF ANY RELEVANT PATENTS 
OR TRADEMARKS, AND ITS COMPLIANCE WITH OR NON-VIOLA-
TION OF ANY APPLICABLE ENVIRONMENTAL, HEALTH OR SAFETY 
LEGISLATION; THE TERM OF ANY OTHER WARRANTY NOT HEREBY 
CONTRACTUALLY EXCLUDED IS LIMITED SUCH THAT IT SHALL NOT 
EXTEND BEYOND TWENTY-FOUR (24) MONTHS FROM THE PRODUC-
TION DATE, TO THE EXTENT THAT SUCH LIMITATION IS ALLOWED BY 
THE GOVERNING LAW. 

Product Warranty Return Procedure

 All Products that are believed to 

have defects in workmanship or materials must be returned, together 
with a written description of the defect, to the tekmar Representative 
assigned to the territory in which such Product is located. If tekmar 
receives an inquiry from someone other than a tekmar Representative, 
including an inquiry from Purchaser (if not a tekmar Representative) or 
Purchaser’s customers, regarding a potential warranty claim, tekmar’s 
sole obligation shall be to provide the address and other contact informa-
tion regarding the appropriate Representative.

Technical Data

tN4 Wiring Center 315

 

Six Zone Valves

 

Literature

C315, D315, Q315

Control

Microprocessor control. This is not a safety (limit) control.

Packaged weight

1.4 lbs (630 g)

Dimensions

5.5” H x 5.5” W x 2.25” D (140 x 140 x 57 mm)

Enclosure

Blue PC+ABS plastic, NEMA type 1

Approvals

CSA C US, meets class B: ICES & FCC Part 15

Ambient conditions

Indoor use only, 32 to 122°F (0 to 50°C), RH   90% Non-condensing

Power supply

24 V (ac) ±10% 60 Hz, 3 VA min, 98 VA max, Class 2

Zone valve load

24 V (ac) 2 A, maximum combined current (zones 1 to 6): 4 A 

End switch relay

24 V (ac) 2 A

Zone group pump relay

115 V (ac) 5 A, 1/6 hp

Warranty

Limited 3 Year

 Limited Warranty and Product Return Procedure