Tekmar 284 - Page 25

© 2016 284_D - 05/16
25 of 60
A Watts Water Technologies Company
Heat
56
Call
IDHW
7
8
Call
Setpoint
91
0
Call
Wiring a Heat Call Terminals 5, 6
Wiring an Indirect DHW (IDHW) Call Terminals 7, 8
Wiring a Setpoint Call Terminals 9, 10
The 284 requires a switched external heat call to operate the boiler plant unless calls for heat are generated through
a tekmarNet
®
device, EMS, BACnet
®
or Modbus
®
connection. The heat call can be volt free or up to 24 V (ac).
• Connect the Heat Call terminals 5 & 6 to a switched heat demand.
• Typical heat calls are from a zone relay box or thermostat.
• A permanent heat call can be created by installing a jumper wire between terminals 5 & 6.
If the DHW sensor option is not used, a call for indirect domestic hot water can come from an aquastat connected
to terminals 7 & 8. The IDHW Call can be volt free or up to 24 V (ac).
• Connect the IDHW Call terminals 7 & 8 to the DHW tank aquastat.
The Setpoint Call terminals 9 & 10 can receive a call for heat from a setpoint control or thermostat. The setpoint
call can be volt free or up to 24 V (ac).
• Connect the Setpoint Call terminals 9 & 10 to the output terminals on a setpoint control or thermostat.
51 52
Mod
Boiler 1
53 54
Stage 1Stage 2
55 56
+
-
Single Stage Boiler Wiring Terminals 53 to 72
A single stage condensing or non-condensing boiler is enabled through the T T contacts.
• For Boiler 1 connect Stage 1 terminals 53 & 54 to the boiler TT contacts.
• For Boiler 2 connect Stage 1 terminals 59 & 60 to the boiler TT contacts.
• For Boiler 3 connect Stage 1 terminals 65 & 66 to the boiler TT contacts.
• For Boiler 4 connect Stage 1 terminals 71 & 72 to the boiler TT contacts.
Stage 1
TT
Stage 2
TT
Stage 1
TT
51 52
Mod
Boiler 1
53 54
Stage 1Stage 2
55 56
+
-
Two Stage Boiler Wiring Terminals 53 to 74
A two stage condensing or non-condensing boiler requires two wires for each stage.
• For Boiler 1 connect Stage 1 terminals 53 / 54 & 55 / 56 to the boiler stage 1 & stage 2 contacts.
• For Boiler 2 connect Stage 1 terminals 59 / 60 & 61 / 62 to the boiler stage 1 & stage 2 contacts.
• For Boiler 3 connect Stage 1 terminals 65 / 66 & 67 / 68 to the boiler stage 1 & stage 2 contacts.
• For Boiler 4 connect Stage 1 terminals 71 / 72 & 73 / 74 to the boiler stage 1 & stage 2 contacts.
Boiler Control 284
Boiler Control 284
Boiler
Control 284
Boiler
Control 284
Boiler
Control 284