155 of 222 pages
Operating and service manual
844
Hot gas valve
Alarm
Description
Hot gas Valve Fault
Cause
Indication of non-operating hot gas valve
Trouble
shooting
Possible causes:
•
Cable for hot gas valve mounted on wrong valve.
•
Cable for hot gas valve defect.
•
Hot gas valve defect.
•
Driver circuit for hot gas valve defect.
Accompanied alarms:
•
N/A.
Trouble shooting:
1) If there is more than one valve failure, the cables for the valves are
presumably switched. Mount cables for valves on the correct valve.
2) Listen if the hot gas valve is opening and closing, if not go to step 4). If the
valve is opening and closing disconnect power to the solenoid coil, when the
valve is closed and there is hot temperature after the valve (pos. 32 in the
P – I diagram), the hot gas valve has a leak and should be replaced. Internal
parts of the hot gas valve can be replaced separately.
3) Check that the cable for the hot gas valve is not defect. Replace cable if it is
damaged.
4) Disconnect the cable for valve and measure that there is voltage on the
output for the hot gas valve when it should open.
a. If there is no voltage, the controller PCB is defect. Replace the controller
door.
Criteria
Pdis more than (>) 5 BarE: Max change on Pdis: ±0.75 Bar
Pdis is less than (<) 5 BarE: Max change on Pdis: ±0.30 Bar
Tret is more than or equal (
≥
) to -15°C: Min. change on T0: +20°K
Tret is less than (<) -15°C: Min. change on T0: +10°K
Controller
action
None
Log
X
Alarm
X
Alarm light
Slow flash
Consequence
Test failed
Elimination
Alarm may then be deleted after test completed
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive T0
T0 diff.
Pdis
Pdis old
