Tekmar 304P Installation & Operation Manual

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304P_D

12/18

Zoning

Replaces: 11/16

Switching Relay 304P

Installation & Operation Manual

• RoomResponse

signal

• Compatible with all low voltage thermostats
• Unlimited zone expansion
• Zone priority
• Priority override
• Pump exercising
• Post purge

• LED for each zone, priority, end switch and RoomResponse

•  Away signal shared between tekmar thermostats
•  Four ground screws
•  Top, bottom and back conduit knockouts
•  Fuses protect transformers and pumps
•  Two spare fuses included
• CSA approved

Introduction

The Switching Relay

304P

connects up to four thermostats and operates circulators to provide heating to a zoned hydronic

heating system. Zone 1 has optional priority over zones 2 through 4 and can be used to provide heat to an indirect
domestic hot water tank. The 304P includes optional exercising to prevent circulator seizure when not in use, and optional
post purge operation of the last operating zone to maximize energy savings. The 304P provides a RoomResponse

signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.

RoomResponse

Power

Priority

Zone 1

Zone 2

Zone 3

Zone 4

Switching Relay 304P

Four Zones with Priority

H3020A

Features

2 of 12

Table of Contents

Important Safety Information .............................................2
Installation .........................................................................3

Preparation .................................................................... 3
Location ......................................................................... 3
Installing the Enclosure ................................................. 3
Application 304P–1 ........................................................ 4
Application 304P–2 ....................................................... 5
Application 304P–3 ....................................................... 6

User Interface ....................................................................7

Indicator LED ................................................................. 7

Sequence of Operation .....................................................7
Technical Data ..................................................................12
Limited Warranty and Product Return Procedure ............12

Important Safety Information

It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. tekmar is
not responsible for damages resulting from improper installation and/or maintenance.

This is a safety-alert symbol. The safety alert symbol is shown alone or used with a signal word (DANGER,
WARNING, or CAUTION), a pictorial and/or a safety message to identify hazards. When you see this symbol
alone or with a signal word on your equipment or in this manual, be alert to the potential for death or serious
personal injury.

This pictorial alerts you to electricity, electrocution, and shock hazards.

This symbol identifies hazards which, if not avoided, could result in death or serious injury.

This symbol identifies hazards which, if not avoided, could result in minor or moderate injury.

This symbol identifies practices, actions, or failure to act which could result in property damage or damage to
the equipment.

Read manual and all product labels BEFORE using the equipment. Do not use unless you know
the safe and proper operation of this equipment. Keep this manual available for easy access by all
users. Replacement manuals are available at tekmarControls.com

• It is the installer’s responsibility to ensure that this control is safely installed according to all applicable codes and

standards.

• Improper installation and operation of this control could result in damage to the equipment and possibly even personal

injury or death.

• This 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.

The control includes fuses and transformer that are serviceable. Do not attempt to service any other parts on the control.
Attempting to service the control voids the warranty.

•  Strip all wiring to a length of 3/8 in. or 10 mm for all terminals.
•  A circuit breaker or power disconnect that provides power to the control should be located nearby and clearly labeled.
•  Refer to the current and voltage ratings at the back of this manual before connecting devices to this control.

3 of 12

Preparation

Tools Required

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

• tekmar or jeweler screwdriver
• Phillips head screwdriver

• Needle-nose pliers
• Wire stripper

Materials Required

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

Packaging Contents

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

• 18 AWG LVT solid wire (low-voltage connections)
• 14 AWG solid wire (line-voltage connections)

• Four 1/8" - 1" wood screws

Installation

• 1 Switching Relay 304P
• 2 Spare fuses (located in cover)

• 1 Installation and Operation Manual 304P_D

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 exi-
gences du Règlement sur le matériel brouilleur du Canada.

Radio Frequency Interference

Location

•  Keep the control dry. Avoid potential leakage onto the control.
•  Maintain relative humidity less than 90% in a non-condensing environment.
•  Avoid exposure to extreme temperatures beyond 32-122°F (0-50°C).
•  Install away from equipment, appliances, or other sources of electrical interference.
•  Install to allow easy access for wiring, viewing, and adjusting the display screen.
•  Install approximately 5 feet (1.5 m) off the finished floor.
•  Locate the control near pumps if possible.
•  Provide a solid backing which the enclosure can be mounted to. Example: plywood or wall studs.
•  Use the conduit knockouts provided on the upper, lower, and back of the enclosure for wiring.

Installing the Enclosure

To prevent the risk of personal injury and/or death, make sure power
is not applied to the control until it is fully installed and ready for final
testing. All work must be done with power to the circuit being worked
on turned off.
Please be aware local codes may require this control to be installed
or connected by an electrician.

4 of 12

Application 304P–1

Mechanical

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

Electrical

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

Legend

B1 = Boiler
P1 to P4 = Zone 1 through 4 Pumps
T1 = WiFi Thermostat 561 or 562
T2 = Thermostat 518 or 519
T3 = Generic Digital Power-Stealing Thermostat
T4 = Generic Bi-Metallic Strip Thermostat

304P

DIP Switches

Master
T-stat 1 Priority Off
Exercising On
Post Purge On
Mod Boiler - not applicable

Away

C R Rh W

Away

C R Rh W

R W

FUSE 2

FUSE 7

FUSE 8

FUSE 3

FUSE 4

FUSE 5

FUSE 6

70 80

100

MOD MAX %

MASTER

MEMBER
OFF
OFF
OFF
4-20 mA

T-STAT 1 PRIORITY : 0N

EXERCISING : ON

POST PURGE : ON

MOD BOILER : 0-10V

RESERVED

FUSE 1

120 VAC

POWER

MOD

tN4

POWER

ROOM

RESPONSE

DHW

BOILER

T-STAT 1

T-STAT 2

T-STAT 3

PRIORITY

PUMP 1

PUMP 2

PUMP 3

PUMP 4

PUMP 5

PUMP 6

tN4

R W

T-STAT 4

tN4

A C R W

T-STAT 5

tN4

R W

T-STAT 6

EXPANSION

tN4

R W

tN4

L N

The Switching Relay 304P operates the circulators for four heating zones when the corresponding thermostat calls for heat.
The boiler is fired whenever a zone calls for heat.

5 of 12

Application 304P–2

Electrical

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

DIP Switches

Master
T-stat 1 Priority On
Exercising On
Post Purge On
Mod Boiler - depends on boiler

Away

C R Rh W

Away

C R Rh W

R W

FUSE 2

FUSE 7

FUSE 8

FUSE 3

FUSE 4

FUSE 5

FUSE 6

70 80

100

MOD MAX %

MASTER

MEMBER
OFF
OFF
OFF
4-20 mA

T-STAT 1 PRIORITY : 0N

EXERCISING : ON

POST PURGE : ON

MOD BOILER : 0-10V

RESERVED

FUSE 1

120 VAC

POWER

MOD

tN4

POWER

ROOM

RESPONSE

DHW

BOILER

T-STAT 1

T-STAT 2

T-STAT 3

PRIORITY

PUMP 1

PUMP 2

PUMP 3

PUMP 4

PUMP 5

PUMP 6

tN4

R W

T-STAT 4

tN4

A C R W

T-STAT 5

tN4

R W

T-STAT 6

EXPANSION

tN4

R W

tN4

T-T

DHW

L N

A1 = DHW Tank Aquastat
B1 = Modulating Condensing Boiler
BP = Boiler Pump
P1 = Zone 1 DHW Tank Pump
P2 to P4 = Zone 2 through 4 Pump
T1 = WiFi Thermostat 561 or 562
T2 = Thermostat 518 or 519
T3 = Generic Bi-Metallic Strip Thermostat

Mechanical

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

304P

The Switching Relay 304P operates four heating zone circulators when the corresponding thermostat calls for heat. Zone 1
heats a domestic hot water tank. When priority is selected, zones 2 through 4 shut off when zone 1 is heating. The boiler is
fired when there is a call for heat.

Legend

6 of 12

Away

C R Rh W

Away

C R Rh W

Away

C R Rh W

Away

C R Rh W

Away

C R Rh W

R W

FUSE 2

FUSE 7

FUSE 8

FUSE 3

FUSE 4

FUSE 5

FUSE 6

70 80

100

MOD MAX %

MASTER

MEMBER
OFF
OFF
OFF
4-20 mA

T-STAT 1 PRIORITY : 0N

EXERCISING : ON

POST PURGE : ON

MOD BOILER : 0-10V

RESERVED

FUSE 1

120 VAC

POWER

MOD

tN4

POWER

ROOM

RESPONSE

DHW

C R W

BOILER

T-STAT 1

T-STAT 2

T-STAT 3

PRIORITY

PUMP 1

PUMP 2

PUMP 3

PUMP 4

PUMP 5

PUMP 6

tN4

C R W

tN4

C R W

T-STAT 4

tN4

A C R W

T-STAT 5

tN4

C R W

T-STAT 6

EXPANSION

tN4

C R W

tN4

FUSE 2

FUSE 7

FUSE 8

FUSE 3

FUSE 4

FUSE 5

FUSE 6

70 80

100

MOD MAX %

MASTER

MEMBER
OFF
OFF
OFF
4-20 mA

T-STAT 1 PRIORITY : 0N

EXERCISING : ON

POST PURGE : ON

MOD BOILER : 0-10V

RESERVED

FUSE 1

120 VAC

POWER

MOD

tN4

POWER

ROOM

RESPONSE

DHW

C R W

BOILER

T-STAT 1

T-STAT 2

T-STAT 3

PRIORITY

PUMP 1

PUMP 2

PUMP 3

PUMP 4

PUMP 5

PUMP 6

tN4

C R W

tN4

C R W

T-STAT 4

tN4

A C R W

T-STAT 5

tN4

C R W

T-STAT 6

EXPANSION

tN4

C R W

tN4

Application 304P–3

Mechanical

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

Electrical

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

Legend

Expansion

304P

Two Switching Relay 304P's operate eight heating zone circulators. The two controls are connected together using an expansion
bus wire. The master 304P fires the boiler when any zone calls for heat. If priority is selected, zones 2 through 8 shut off when
zone 1 is calling for heat.

A1 = DHW Tank Aquastat
B1 = Modulating Condensing Boiler
BP = Boiler Pump
P1 = Zone 1 DHW Tank Pump
P2 to P8 = Zone 2 through 8 Pump

T1 to T3 = WiFi Thermostat 561 or 562
T4 to T5 = Thermostat 518 or 519
T6 = Generic Digital Power-Stealing Thermostat
T7 = Generic Bi-Metallic Strip Thermostat

DIP Switches

Master
T-stat 1 Priority On
Exercising On

Post Purge On
Mod Boiler - depends on boiler

DIP Switches

Member
T-stat 1 Priority Off
Exercising On

Post Purge On
Mod Boiler - not applicable

7 of 12

User Interface - Indicator LED

Sequence of Operation

Zone Operation

When a thermostat calls for heat by closing the R and W
terminals:
• 115 V (ac) is applied to the corresponding circulator pump.
• The corresponding zone indicator LED is turned on.

Boiler Operation

When a thermostat calls for heat by closing the R and W
terminals:
• The boiler end switch XX is closed to fire the boiler.
• The RoomResponse

0-10 V (dc) or 4-20 mA signal is sent

to a modulating-condensing boiler.

DHW Operation

Many modulating-condensing boilers have multiple temperature
call inputs. Wire the DHW end switch to input recommended
in the boiler's manual.
When a zone 1 calls for heat by closing the R and W terminals:
• The DHW end switch is closed to fire the boiler at the DHW

temperature.

• The Mod Boiler output is changed to 10 V (dc) or 20 mA.

Master / Member DIP Switch

• Allows for unlimited expansion using additional Switching

Relays and/or Zone Valve Controls.

•  The Master Switching Relay is wired and operates the boiler.
•  If using a single Switching Relay set to Master.
•  When using multiple Switching Relays and/or Zone Valve

Controls, set one control to Master and set all other con-
trols to Member.

T-Stat 1 Priority DIP Switch

When T-Stat 1 is calling for heat by closing the R and W
terminals:
•  115 V (ac) is applied to the zone 1 circulator pump.
•  Zone 1 indicator LED is turned on.
•  Priority indicator LED is turned on.
•  Zones 2 to 6 circulator pumps and LEDs are turned off.
•  Expansion Member controls shut off their zones.
•  After 60 minutes of continuous zone 1 call for DHW heating,

zones 2 to 6 and all Expansion Member control zones are
able to turn back on. This prevents building freeze up if the
DHW tank aquastat fails in the closed position.

Exercising DIP Switch

ON: Each circulator pump is energized for 30 seconds every
72 hours.
OFF: Circulator pump exercising disabled.

Post Purge DIP Switch

ON: After the last thermostat stops calling for heat, the last
circulator pump remains on for 2 minutes to purge heat from
the boiler to the zone.
OFF: Post purge disabled.

Mod Boiler DIP Switch

Select either 0-10 V (dc) or 4-20 mA signal to the modulating
condensing boiler. Consult the boiler manual to determine
the signal type. The DIP switch position does not matter if
the modulating boiler output is not used.

Fuses

• All fuses are T5A 250V slow blow.
• Fuses 1 to 4 correspond to the zone 1 to 4 circulator pump

output. If a fuse is blown, first check that the pump is not
seized and the wiring is not shorted. Then replace the fuse.

• Fuse 7 and 8 correspond to the 24 V (ac) transformer power

supply. If a fuse is blown, first check that the thermostat
wiring is not shorted. Then replace the fuse.

Expansion Terminals

Connect the five wires of the expansion bus from the master
to the member controls.

Terminal Description

A/tN4

Away signal connecting tekmar thermostats

RoomResponse

signal from member controls

Power common

Demand signal. 0 Vdc = demand. 2 Vdc = no demand

Priority signal. 0 Vdc = priority. 2 Vdc = no priority

Power

• On when 115 V (ac) is applied.
• Off when power disconnected or transformer fuse is blown.

Priority

• On when zone 1 has priority over zones 2 to 4.

RoomResponse

• On when modulating condensing boiler is operating below

maximum setting.

Zone 1

• On when thermostat 1 calls for heat.

Zones 2 to 4

•  On when the corresponding thermostat calls for heat.
•  Off during priority operation.
•  Off when corresponding thermostat stops calling for heat.

8 of 12

RoomResponse

Signal

The RoomResponse

signal adjusts the temperature of a

modulating condensing boiler that accepts a 0-10 V(dc) or
4-20 mA input. It works by continually adjusting boiler water
temperatures to the lowest possible value to meet comfort
without wasting energy. This is done by monitoring each
thermostat's on and off time pattern and determines the ideal
water temperature for each zone. The control then chooses the
highest water temperature requirement of all the thermostats
and provides a 0-10 V (dc) or 4-20 mA signal proportional to
the boiler operating temperature. The RoomResponse

signal

is a DOE compliant method of controlling boiler temperature
to building load. The RoomResponse

signal is not available

to on/off boilers.
Benefits of the RoomResponse

signal include:

•  Increase in boiler efficiency
•  Reduction in room temperature swing
•  Reduction in expansion noises from heating pipes

Mod Max % Dial

The upper limit of the 0-10 V (dc) or 4 -20 mA signal to the
modulating condensing boiler can be set using the Mod Max
% Dial.
This sets the upper temperature limit for the boiler.

The dial is only applicable to controls set as the Master.

Mod Max %

Max Voltage

Max mA

13.6

15.2

16.8

18.4

100

Setting the Max Mod % Dial

Boiler Make/Model

Required Adapter

(Supplied by boiler

manufacturer)

0-10 V (dc) /

4-20 mA

DIP Switch

Mod Max % Dial for Boiler Design Temperature

120°F

140°F

160°F

180°F

Aerco AM series

Not required

0-10 V

50%

65%

80%

100%

Bosch Greenstar

ICM Module

0-10 V

55%

70%

80%

100%

Buderus GB142, GB162

EM10 Module

0-10 V

50%

60%

75%

90%

Burnham

Alpine

™

Not required

4-20 mA

50%

70%

85%

100%

Camus

Modulating Micoflame

Not required

0-10 V

50%

60%

70%

85%

HTP Elite

Not required

0-10 V

50%

65%

80%

90%

IBC VFC and SL series

Not required

0-10 V

65%

75%

85%

100%

Laars

Mascot LX

Not required

0-10 V

55%

70%

85%

100%

Laars

Mascot FT

Not required

0-10 V

50%

65%

80%

100%

Lochinvar

Knight

™

Not required

0-10 V

55%

70%

85%

100%

Lochinvar

FTXL

Not required

0-10 V

55%

70%

85%

100%

NTI Trinity Fire Tube and LX

Not required

4-20 mA

55%

65%

75%

90%

Peerless PureFire

PFA-1 Adapter

0-10 V

55%

65%

75%

90%

Raypak Xfyre, Xtherm, MVB, XPakFT

Not required

0-10 V

55%

65%

80%

90%

Riverside HeatStation

Not required

0-10 V

50%

65%

85%

100%

Viessmann 100-W, WB1B

OpenTherm

Module

0-10 V

55%

70%

85%

100%

Viessmann 200-W, B2HB and 300 CU3A

Not required

0-10 V

50%

60%

70%

80%

Weil-McLain

Evergreen

Not required

0-10 V

50%

70%

85%

100%

* Requires changes to boiler's settings

70 80

100

MOD MAX %

Mod Max % dial set to 100% in the illustration.

9 of 12

Bosch ICM

Aerco AM

Camus

Micoflame

HTP

Elite

Buderus

EM10 Module

Burnham

Alpine

304P

• Install the Bosch ICM as per the directions.
• Set ICM jumper to the left position to enable system supply

water temperature (VT) mode.

• Install the Buderus EM10 module as per the directions.
• Do NOT install the jumper between U terminals 1 and 3 on

the EM10 module.

• Change control to mode 6 in the control parameters.

• Move jumper on connection board from A to B.
• Set function 17 to temperature.

• Change Parameter 9 Remote 4-20 mA to Setpoint Source.
• Change "Energy Management" setting "Central Heat

Modulation Source" to 4-20 mA.

• Change "Energy Management" setting "Central Heat 4-20

mA Setup, 4 mA Water Temperature" to 80°F (26.5°C).

–

2 9 10

• No changes to the boiler are required.

Aerco AM Series

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

Bosch Greenstar

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

Buderus GB142 and GB162

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

Burnham Alpine

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

Camus Modulating MicoFlame

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

Heat Transfer Products Elite

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

IBC VFC and SL Series

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

Laars Mascot LX

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

On the V10 controller:
•  Set Load 1 to External Control
•  Change "Max Control @ 9.5 Vdc" to 190°F (88°C)
•  Change "Min Control @ 2.1 Vdc" to 32°F (0°C)

IBC V10

Control

304P

–

2 9 10

• Change Installer Parameter 25 "0-10V to Power" to Disabled.
• Change Installer Parameter 26 "0-10V to outlet setpoint" to

Disabled.

Laars

Mascot LX

304P

–

6 11 12

10 of 12

• No changes to the boiler are required.

• Install the Peerless PFA-1 Interface Adapter
• On the boiler display, change Central Heating Mode to 4 for

0-10 VDC Input to Modulate Setpoint

•  Set boiler PIM DIP switch 2 to Off.
•  Set boiler PIM DIP switch 5 to On.
•  Set boiler PIM DIP switch 6 to Off.
•  Set APP parameter to EMS
•  Set SIGNAL parameter to 0-10Vdc
•  Set SETP LO to 70°F
•  Set SETP HI to 180°F

• Set BMS Type to Setpoint. This is the factory default setting.

• Set BMS parameter to ACTIVE.
• Set BMS Type to SETPOINT.

• Enter boiler password.
• Set Parameter "Setpoint source" to 4-20mA

Lochinvar

Knight

Lochinvar

FTXL

NTI Trinity LX

Riverside

HeatStation

NTI Trinity Fire Tube

304P

Sensor I/O

24Vac I/O

–

19 20 33 34

–

21 22 35 36

–

CH1

–

5 11 12

–

CH1

–

4 5

–

EMS

Laars

Mascot FT

Peerless
Pinnacle

Terminal Strip

Peerless
Pinnacle

Control Board

Peerless

PFA-1 Interface

Adapter

304P

J18

–

1 2

Laars Mascot FT

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

Lochinvar Knight

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

Lochinvar FTXL

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

NTI Trinity LX

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

NTI Trinity FireTube

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

Peerless Pinnacle PF-200, 210, 300, 399

---------

Riverside HeatStation

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

11 of 12

• Set boiler PIM DIP switch 2 to Down.
• Set boiler PIM DIP switch 5 to Up.

• Use Local Priority 1 for DHW tank heating.
• Use Local Priority 2 for the RoomResponse

signal.

•  Set Local Priority 2 Supply Min to 60°F.
•  Set Local Priority 2 Supply Max to 180°F.
•  Set Local Priority 2 Volts For Min to 2 V.
•  Set Local Priority 2 Volts For Max to 10 V.

• Install the OpenTherm Module as per the boiler manufac-

turer's instructions.

Raypak MVB or

XTherm

Raypak XFyre or

XPakFT

304P

–

13 14 17 18

–

9 10

Viessmann

OpenTherm Module

Viessmann

Extension Module EA1

Plug 0-10V

Weil-McLain

Evergreen P15

304P

–

• Connect to the Viessmann Extension Module EA1 Plug 0-10V.

Viessmann Vitodens 100-W, WB1B

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

Weil-McLain Evergreen

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

Raypak MVB and XTherm

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

Raypak XFyre and XPakFT

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

Viessmann Vitodens 200-W, B2HP and
Vitocrossal 300 CU3A

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

WARNING:

This product contains chemicals known to the State of

California to cause cancer and birth defects or other reproductive harm.

For more information: Watts.com/prop65

304P_D - 12/18

12 of 12

Tel: (250) 545-7749 • Fax: (250) 984-0815

tekmarControls.com

All specifi cations are subject to change without notice

Limited Warranty

The liability of tekmar under this warranty is limited. The

Purchaser, by taking receipt of any tekmar product (“Product”), acknowl-
edges 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 Prod-
uct 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 twen-
ty-four (24) months from the production date if the Product is not installed during
that period, or twelve (12) months from the documented 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 product; or to the exchange of the
defective product for a warranty replacement 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 prod-
uct liability, 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 workmanship or materials,
including any liability for fundamental breach of contract.

The pass-through Limited Warranty applies only to those defective Products
returned to tekmar during the warranty period. This Limited Warranty 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 cus-
tomers which are different from or in excess of the tekmar Limited Warranty are the
Purchaser’s sole responsibility and obligation. Purchaser 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 war-
ranties by Purchaser to its customers.

The pass-through Limited Warranty does not apply if the returned Product 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 Prod-
uct 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 CONTRACTU-
ALLY EXCLUDE, INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DURA-
BILITY OR DESCRIPTION OF THE PRODUCT, ITS NON-INFRINGEMENT OF
ANY RELEVANT PATENTS OR TRADEMARKS, AND ITS COMPLIANCE WITH
OR NON-VIOLATION 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 PRODUCTION 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.

Limited Warranty and Product Return Procedure

Technical Data

Switching Relay 304P

Four Zones with Priority

Literature

304P_C, 304P_D, 304_J

Control

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

Packaged weight

5.0 lb. (2250 g)

Dimensions

8-3/16" H x 10-12/18" W x 2-3/8" D (208 x 271 x 60 mm)

Enclosure

Cover: ABS plastic, Base: galvanized steel, NEMA type 1

Approvals

CSA C US

Ambient conditions

32 to 122°F (0 to 50°C), ≤ 90% RH non-condensing

Power supply

115 V (ac) ±10%, 60 Hz, 17.3 A

Transformer

40 VA at 24 V (ac), expandable to 80 VA with additional transformer M3069 (sold separately)

Control load

7 VA at 24 V (ac)

Fuses

T5A 250 V slow blow, two spare fuses included

Pump relays

115V (ac), 5 A, 1/3 hp, 17.3 A combined

Boiler XX end switch

24 V (ac), 5 A

DHW end switch

24 V (ac), 5 A

Mod boiler output

0-10 V (dc) 500 Ω min impedance / 4-20 mA 1 kΩ max impedance

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PDF User Manual

306P

Full Text Searchable PDF User Manual