83
Problem Possible Cause Check or Remedy
Compressor(s) do not come
on - continued
Smoke detector alarm activated
Firestat temperature alarm activated
Faulty cool 1
st
stage relay
Faulty cool 2
nd
stage rely
Cooling confi guration
Reset the smoke detector
System in inhibited until return air tempera-
ture is below the fi restat limit menu 4-6
Use manual test relay check sub menu 9-3.
Use manual test relay check sub menu 9-3
Check setting on sub menu 5-4.
Optional compressor un-
loader for cool 3 and cool 4
does no come on
No call for 3
rd
or 4
th
stage cooling
Incorrect confi guration in compressor
menu
Panel is operating in manual override
and the the compressor manual over-
ride in not ON
Faulty cool 3
rd
stage K10 relay
Faulty cool 4
th
stage K10 relay
Loose connection on optional Relay
Module
Loose connections on plugs or cable
Check temperature setpoint and deadband
Check settings in sub menu 5-4. It should be
set for primary/secondary-primary/secondary
Check manual override switches
Use manual test relays test to check. Refer
to sub menu 9-3.
Use manual test relays test to check. Refer
to sub menu 9-3.
Check Relay Module card connections on PC
board
Check connections on P15-2, P15-3 and
wires 37 and 38
Optional Energy Saver not
functioning
No call for cooling
Waterstat not closed
Waterstat changeover setpoint too
high
Loose connection on pin P13-1 and
P-13-2
Incorrect confi guration
Inhibited by inter-stage time delay
The following applies to Energy Saver
without compressor supplement
Return temperature is higher than the
Energy Saver range, Temperature
SP+DB+2.0
0
F
Energy Saver is inhibited for lock-out
time set in menu 3-5
Check temperature setpoint and deadband
Check waterstat and 24 VAC on pin #19 of
TB2
Adjust as required, sub menu 2-6
Check connection and cable
Check settings in sub menu 5-7. It must be
set for Energy Saver Cooling
Refer to cooling control logic
Refer to Energy Saver control logic without
compressor supplement
Check setting in Menu 5-7. An optional
discharge air sensor is required for Energy
Saver with compressor supplement
Energy Saver will resume after lock-out time
if the water temperature falls within the oper-
ating range. Refer to Energy Saver Control
Logic