Wiring Diagrams

HPZ AND HSR HYDRONIC PANEL WIRING DIAGRAMS
13 33-00476—01
Fig. 12. Staging a boiler + secondary heat using a 2 stage thermostat & an isolation relay.
(Relay not required with select thermostat models. See Fig. 11 on page 12.)
W
1
3
W CRW2 Rc
C
W2 RWRc Y G
C
W
R
Y
G
FURNACE
1
3
2
1
3
2
R
C
W
R
C
W
R
C
W
Zone 1
Priority
Zone 2
Zone 3
2
THE WIRING EXAMPLE SHOWN ON ZONE 2 OF THE HYDRONIC PANEL WOULD BE USED IF THE SECOND STAGE HEAT SOURCE DOESN’T HAVE COMMON TERMINAL
AND COOLING IS NOT USED. THE WIRING CIRCUIT ALSO ASSUMES THE STAGE 2 HEAT SOURCE HAS A BUILT-IN POWER SUPPLY. IF IT DOES NOT, THE POWER
SUPPLY SHOULD BE WIRED IN SERIES WITH THE STAGE 2 HEAT CIRCUIT.
THE WIRING EXAMPLE SHOWN ON ZONE 3 OF THE HYDRONIC PANEL WOULD BE USED IF COOLING IS BEING CONTROLLED BY THE THERMOSTAT OR IF THE
SECOND STAGE HEAT SOURCE HAS A COMMON TERMINAL AVAILABLE.
COMMON WIRE IS OPTIONAL ON MOST NON-WI-FI MODELS. IF COOLING IS NOT USED, DISREGARD THE Y AND G WIRES.
THIS DIAGRAM SHOWS HOW A 2 STAGE THERMOSTAT CAN BE INTEGRATED TO A HYDRONIC PANEL FOR STAGE 1 HEAT AND A DIFFERENT HEAT SOURCE FOR
BACKUP HEAT. THE DIAGRAM DOES NOT SHOW WIRING FOR THE BOILER, PUMP(S), VALVES, DHW CIRCUIT, ETC. SEE OTHER DIAGRAMS IN THIS FILE OR THE
LITERATURE THAT CAME WITH THE HOT WATER PANEL FOR THE REST OF THE HOT WATER PANEL WIRING.
IF THE BACKUP HEAT SOURCE IS ZONED FORCED AIR, THEN THE THERMOSTAT WOULD WIRE TO ONE OF THE ZONES ON THE ZONE PANEL RATHER THAN TO THE
FURNACE DIRECTLY.
1
2
3
4
MCR37977
R8222B
OR EQUIVALENT RELAY
R8222B
OR EQUIVALENT RELAY
1
R
3
6
6
2
5
3
5
COIL
COIL
THERMOSTAT
THERMOSTAT
STATE 2 HEAT
24 VAC THERMOSTAT