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ELECTRICAL CONNECTIONS
Figures 9 and 10 are general wiring diagrams.
For a maintaining temperature boiler, Figure 9
should closely match your system. For cold start
boilers your wiring may resemble Figure 10, but
will vary depending on the boiler type and
controls or relays used. It is not possible to list all
wiring variations here. When connecting to a cold
start boiler, always remember that in principle an
indirect coil tank heater operates as another
heating zone. The difference is when the indirect
calls for heat, the indirect coil tank heater
circulator must start rather than opening a zone
valve; the system circulator stays off; and the
boiler must light to reach high limit.
WIRING NOTES:
1. Dashed lines indicate low voltage (24 VAC)
2. Use jumper wire between terminals #1 and #3
on R845 relay
THERMOSTAT SPECIFICATIONS:
Thermostats can operate at low or line voltages.
24 volt
N/A
120 volt
8 amp
240 volt
5 amp
This equipment must be properly grounded to
prevent a potential shock hazard, and to reduce
deterioration of the anode due to electrolysis.
Refer to local electrical codes and ordinances.
SECTION IV: INSTALLATION (cont.)
Figure 9:
Boiler Maintaining 180°F
Figure 10:
Cold Start Boiler
