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Application 302P-2

Mechanical

Electrical

The Switching Relay 302P operates two heating zone circulators when the corresponding thermostat calls for heat. 
Zone 1 heats a domestic hot water tank. When priority is selected, zone 2 shuts off when zone 1 is heating. The boiler 
is fired when there is a call for heat.

DIP Switches

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

The 302P includes 
internal circuitry 
to support power 
stealing thermostats. 
External resistors are 
not required.

Away

C R Rh W

70

FUSE 2

FUSE 7

FUSE 8

FUSE 3

FUSE 4

FUSE 5

FUSE 6

70 80

90

60

50

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

X X

tN4

POWER

ROOM

RESPONSE

T1

T2

T3

T4

T5

T6

A

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

L

-

+

N

L

N

L

N

L

N

L

N

L

N

L

N

tN4

A C R W

tN4

A C R W

T-STAT 4

tN4

A C R W

T-STAT 5

tN4

A C R W

T-STAT 6

EXPANSION

tN4

A C R W

tN4

A B C D E

+

T-T

DHW

-

B1

A1

T1

P1

L N

P2

Legend

A1 = DHW Tank Aquastat
B1 = Modulating Condensing Boiler
BP = Boiler Pump
P1 = Zone 1 DHW Tank Pump
P2 = Zone 2 Pump
T1 = WiFi Thermostat 561, 562 or 563

B1

P1

P2

A1

BP

302P

Summary of Contents for Switching Relay 303P Series

Page 1: ...ting to a zoned hydronic heating system RoomResponseTM signal Compatible with all low voltage thermostats Unlimited zone expansion Zone priority Priority override Pump exercising Post purge Away signal shared between tekmar thermostats Features LED for each zone priority end switch and RoomResponseTM Four ground screws Top bottom and back conduit knockouts Fuses protect transformers and pumps Two ...

Page 2: ... 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 av...

Page 3: ...screwdriver Needle nose pliers Wire stripper 18 AWG LVT solid wire low voltage connections 14 AWG solid wire line voltage connections Four 1 8 1 wood screws 1 Switching Relay 302P 2 Spare fuses located in cover Installation Manual 302P_D 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 te...

Page 4: ...cable Away C R Rh W R W 70 FUSE 2 FUSE 7 FUSE 8 FUSE 3 FUSE 4 FUSE 5 FUSE 6 70 80 90 60 50 100 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 X X tN4 POWER ROOM RESPONSE T1 T2 T3 T4 T5 T6 A 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 L N L N L N L N L N ...

Page 5: ...ot required Away C R Rh W 70 FUSE 2 FUSE 7 FUSE 8 FUSE 3 FUSE 4 FUSE 5 FUSE 6 70 80 90 60 50 100 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 X X tN4 POWER ROOM RESPONSE T1 T2 T3 T4 T5 T6 A 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 L N L N L N L N L ...

Page 6: ...10V RESERVED FUSE 1 120 VAC POWER MOD X X tN4 POWER ROOM RESPONSE T1 T2 T3 T4 T5 T6 A 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 L N L N L N L N L N L N L N tN4 A C R W tN4 A C R W T STAT 4 tN4 A C R W T STAT 5 tN4 A C R W T STAT 6 EXPANSION tN4 A C R W tN4 A B C D E FUSE 2 FUSE 7 FUSE 8 FUSE 3 FUSE 4 FUSE 5 FUSE 6 70 80 90 60 50 100 MOD MAX MAST...

Page 7: ... Switching Relay set to Master When using multiple Switching Relays and or Zone Valve Controls set one control to Master and set all other controls to Member The boiler end switch XX only closes when the DIP switch is set to Master and does not close when set 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 ...

Page 8: ...e Master Mod Max Max Voltage Max mA 50 5 12 60 6 13 6 70 7 15 2 80 8 16 8 90 9 18 4 100 10 20 FUSE 6 70 80 90 60 50 100 MOD MAX Mod Max dial set to 100 in the illustration 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 ...

Page 9: ... 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 9 10 22 23 5 6 16 17 2 U 1 X X T T 1 2 9 10 No changes to the boiler are required 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 Con...

Page 10: ...etpoint source to 4 20mA Enter boiler password Set Parameter Setpoint source to 4 20mA Lochinvar Knight Lochinvar FTXL NTI Trinity LX Riverside HeatStation NTI Trinity Fire Tube 302P 302P 302P 302P 302P Sensor I O 24Vac I O X X W R 1 2 37 38 X X W R 21 22 35 36 X X CH1 R 3 5 11 12 X X CH1 R 3 5 4 5 8 EMS 9 Laars Mascot FT Peerless Pinnacle Terminal Strip Peerless Pinnacle Control Board Peerless PF...

Page 11: ...P 302P 302P 1 4 1 2 5 6 Connect to the Viessmann Extension Module EA1 Plug 0 10V Switching Relay 302P Two Zones with Priority Literature Submittal 302P_C Installation Manual 302P_D Job Record 302P_J Packaged weight 5 0 lb 2250 g Dimensions 8 3 16 H x 10 11 16 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 RoHS Ambient conditions Indoo...

Page 12: ... made by Pur chaser to its customers 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 warranties by Purchaser to its customers ...

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