26
CAUTION
• When making low voltage connections, make sure that no external power source
is present in the thermostat circuits. If such a power source is present, it could
destroy the boiler’s control. One example of an external power source that could
be inadvertently connected to the low voltage connections is a transformer in old
thermostat wiring.
• Do not use the transformer provided on the boiler to power external devices such as
zone valves. Doing so may cause damage to the transformer.
Indirect Water Heater Wiring
Figure 11.2 shows field wiring for an indirect water heater. A Honeywell R845A or equivalent DPST relay and transformer
is required. The high limit described in Part VIII must also be supplied by the installer. A call for heat from the indirect
water heater thermostat will energize the relay making both sets of contacts. One set of these contacts then energizes the cir
-
culator. The other set of contacts will make the “R” and “G” contacts on the R8285D control, firing the burner. If the boiler
water temperature exceeds the high limit setting of 180F, the high limit will open the “R” - “G” circuit and the burner will
shut down.
If there is a call for space heat, the heating thermostat will make the “R”-”G” circuit and the boiler will fire without regard
to the status of the indirect water heater. The low water cut-off and pressure limit control will interrupt 120 volt power to the
burner in the event of a low water or excessive pressure condition.
Feeder Wiring for Boilers Equipped with Hydrolevel cG450 low Water cut-offs
1) Using Hydrolevel VXT-120 feeder - Do not alter factory boiler wiring. Connect VXT-120 to CG450 as follows:
•
Connect the
BlacK
lead on the feeder to terminal
a
on the CG450.
•
Connect the
WHItE
lead on the feeder to terminal
2
on the CG450.
Содержание FSZ080
Страница 2: ......
Страница 14: ...12 FIGURE 6 4 ALLAIR FROM OUTDOORS USING HORIZONTAL DUCTS INTO BOILER ROOM...
Страница 18: ...16 FIGURE 8 1 STEAM BOILER PIPING FOR GRAVITY RETURN...
Страница 26: ...24 FIGURE 10 2 TWO PIPE GRAVITY FEED SYSTEM NOT RECOMMENDED FIGURE 10 3 TWO PIPE LIFT SYSTEM...
Страница 29: ...27 FIGURE 11 0 WIRING CONNECTIONS DIAGRAM STEAM CG450 PROBE LWCO...
Страница 30: ...28 FIGURE 11 1 CONNECTIONS WIRING DIAGRAM FOR BURNER SPECIFIC PRIMARY CONTROL...
Страница 31: ...29 FIGURE 11 2 INDIRECT WATER HEATER FIELD WIRING...
Страница 41: ...39 Notes...
Страница 43: ...41...
Страница 45: ...43...
Страница 47: ...45...
Страница 51: ...Notes...