American Dream Ultra Performance Geothermal Copper Series, Инструкция по установке и обслуживанию

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Page 36 000744MAN-02 25 MAY 2009
AIR OPERATION TROUBLESHOOTING - COOLING MODE
Fault Possible Cause Verification Recommended Action
Heating instead
of cooling
Thermostat not set up
properly. Verify that there is 24VAC across
O/B/W1 and C of the terminal strip
when calling for cooling. Correct thermostat setup.
Change to a different thermostat.
High Pressure
control trips
Faulty reversing valve so-
lenoid coil. Verify solenoid by removing it from
the shaft while the unit is running.
There should be a loud “whoosh”
sound when it is removed. Dis-
charge pressure will continue to
rise even if there is a loop switch. Replace solenoid if faulty.
Faulty reversing valve. A click can be heard when the coil
is energized but hot gas is still di-
rected to the air coil. Discharge
pressure will continue to rise even if
there is a loop switch. Replace reversing valve.
Faulty Loop Pressure
switch Loop LED does not come on
around
480PSIG . Shorting S and S
causes the LED to come on.
Replace loop pressure switch.
Faulty Loop Pressure
switch Input Shorting S and S does not cause
the Loop Switch LED to come on,
or does not cause a loop change. Replace the control board.
High Pressure
control and man-
ual high pressure
control trips
(very fast) Faulty reclaim valve sole-
noid. Verify solenoid by removing it from
the shaft while energized. If there
is no click the solenoid is bad Replace reclaim solenoid coil.
Faulty reclaim valve. A click can be heard when the
valve is selected but the unit still
trips out. Replace the reclaim valve
Faulty control board out-
put. (L1 to L5). Loop LED does not come on or
there is no 24VAC across the loop
output and C of the control board
when the loop is selected. Replace the control board.
Loop changes
occur too fre-
quently Cooling TXV adjusted too
far closed or stuck or par-
tially blocked Continuous loop changing (every 7
seconds) in two loop mode, high
suction pressure, hot compressor. Adjust TXV or replace if faulty.
Unit overcharged. Frequent loop changes. Switch to
heating mode to confirm. Remove refrigerant 1/2 pound at a
time in heating mode.
Loop field saturated Frequent loop changes in two loop
mode after some season runtime. Install soaker hose.
Loop field too small Frequent loop changes in two loop
mode after some season runtime. Increase loop size.