Reznor ZQYRA Unit Installation Manual - Manual (Page 69)

Form I-ZQYRA P/N 260414R5, Page 69
Compressor Controller
LED’s
LED State
Indicates Additional Information
Color CODE
Green Solid Power (24VAC present at power
terminals)
Compressor starts only when demand signal input is above 1.45 VDC and no ALERTS
(red LED flashes) are active.
Green Flashing Anti-short cycle timer is active
Yellow Solid Unloader (Solenoid valve is ener-
gized; compressor capacity is 0.)
Compressor always unloads for 0.1 second at startup.
Red Not lit No abnormal operation alerts
Red 2 Flashes High Discharge Temperature Alert
(thermistor temperature above 268°F
or thermistor is short circuited)
Compressor will be allowed to restart after a 30-minute delay and after the thermistor tem-
perature is below 250°F. Compressor will lockout after 5 alerts within 4 hours and can only
be reset by cycling the 24VAC power off and on.
Red 3 Flashes Compressor Protector Trip (demand
signal >1.44VDC & no compressor
current)
Possible causes - internal overload, fuse or breaker, compressor wiring. After 2-minute
anti-short cycle timer the controller will attempt to restart the compressor as long as
demand is above 1.44VDC. No lockout feature.
Red 4 Flashes Locked Rotor Alert Locked rotor sensed by controller on four consecutive start-ups. Lockout occurs and can
only be reset by cycling 24VAC power off and on.
Red 5 Flashes Demand Signal Loss (below .5VDC) When demand signal input rises above 0.5VDC, alarm code will reset. When demand
reaches above 1.44VDC and anti-short cycle timer has timed out, compressor will restart.
Red 6 Flashes Discharge Thermistor Fault (no
signal being received)
Compressor capacity limited to 50%. Re-connect or replace thermistor.
Red 7 Flashes Unloader Solenoid Valve Fault
Red 8 Flashes Compressor Contactor Fault
(compressor running on less than
1.44VDC demand signal)
Compressor will run unloaded. Alarm will be reset when current is no longer detected
while system demand signal is below 1.44VDC.
Red 9 Flashes Low 24VAC supply to controller
(below 18.5VAC)
Alarm will reset when supply voltage to controller rises above 19.5VAC.
All Solid Compressor controller failure The installed digital compressor controller can be tested to verify that it is working properly.
In each test, 24VAC must be supplied to 24VAC and 24COM. For output test, 24-250VAC
must be supplied to L1 & L2.
Input Tests - 1) Thermistor Input - Disconnect thermistor (T1 & T2); LED should display
Code 6.; and 2) Demand Input - Disconnect unit controller (C1 & C2); LED should display
Code 5 unless a previous alert code was present.
Output Tests - 1) Contactor Output - while the controller is powered off (no supply voltage
to 24VAC and 24COM), disconnect signal wire from C1 & C2; add jumper wires from P3
to C2 and from P1 to C1; re-apply power to 24VAC and 24COM. If functioning normally,
same voltage should be read across M1 and M2 as across L1 and L2, unless an LED
ALERT code is present.; and 2) Unloader Output - while controller is modulating the
unloader solenoid (whenever the yellow LED is lit), voltage across U1 and U2 should be
the same as L1 and L2.
All Flashing 24VAC Supply too low for operation
10.3.2 Compressor
Digital Controller
Troubleshooting
General - The digital controller is located in the electrical compartment and acts as the
interface between the compressor and the unit controller. If the unit interface display
indicates critical Alarm Code 17, Heat Pump Failure, check the LED lights on the digital
controller.
The alert code (red LED flashes) on the digital controller remains active and the com-
pressor de-energized until the reset conditions have been met or the 24VAC power
is cycled off and on. All Codes except 6 result in compressor (contactor and unloader
valve) being de-energized.