Operating and service manual
154 of 222 pages
843
Economizer valve
Alarm
Description
Economizer Valve Fault
Cause
Indication of non-operating economizer valve
Trouble
shooting
Possible causes:
•
Cable for economizer valve mounted on wrong valve.
•
Cable for economizer valve defect.
•
Economizer valve defect.
•
Driver circuit for economizer 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 economizer valve is opening and closing. If not, then go to 4).
If the valve is opening and closing, close service valve (pos. 30 P-I
diagr. intermediate line). Run the FT again, it the test now is a pass the
economizer valve is defect and should be replaced.
3) Check that the cable for the expansion 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 expansion valve when it should open.
a. If there is no voltage, the controller PCB is defect. Replace the controller
door.
Criteria
Tsuc not changed at least 10°C (50°F) when opening economizer valve a certain time
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
82.XX
T0
Tc
FC power
PFC diff