Granby B*G-3, Инструкция по установке, эксплуатации и обслуживанию, Страница: 31 / 37

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11.3 Trouble shooting the control
System
Condition
Diagnostic
Condition
Check Action
Boiler is cold,
house is cold. Display is OFF 120 V a/c System power. Turn system power on
Display is ON 24 V a/c T-T No 24 V; replace control
24V present; disconnect
thermostat, short T-T
Boiler starts, check wiring and thermostat.
120 V a/c at B1-B2
. If no, replace control.
. If yes, check burner and wiring.
Boiler is hot,
house is cold. Display is ON. 120 V a/c at C1-C2 . 120 V a/c at C1-C2, check wiring to
pump. Wiring OK , is pump running ?
. If not, replace the pump.
. If pump is running, check for trapped air
or closed zone valves.
TESTING SAFETY AND CONTROL DEVICES
In the event the boiler is equipped with a low water cut off, the cut off should be
tested in accordance with the manufacturer’s recommendations. When no
instructions are available follow the guidelines in ASME CSD-1 or perform the
following procedures:
•
Set room thermostat at least 10°F above room tempe rature.
•
With Burner operating, drain boiler slowly until the burner shuts off. This shut
off should occur when the water level falls below the low water cut off probe.
•
Check to be sure the burner shut off is not due to an open limit or flame
safety issue.
•
Reset the room thermostat to the desired temperature and refill the boiler