REV 8/03
21
PROBLEM POSSIBLE CAUSE CHECK OR REMEDY
Smoke alarm goes off. Check and Reset the smoke detector.
Fire stat alarm activated. System is inhibited until return air temp is
below the fire stat limit on Menu #39.
Faulty cool 1
st
stage K2 relay. Use manual diagnostic relay test #2 to test
this relay. Check 24VAC between pin #3
and pin #5 of TB1.
Faulty cool 2
nd
stage K3 relay. Use manual diagnostic relay test #2 to test
this relay. Check 24VAC between pin #3
and pin #6 of TB1.
Compressor comes on
then goes off then shows
“short cycle alarm”.
Incorrect setting on the alarm
input
Check optional alarm 1 setting (menu #40)
.It must be set at “HI PRESS C1” for single
compressor unit. Optional alarm 2 (menu
#41) should be set at “HI PRESS C2” if
unit has two compressors. These optional
alarm inputs should not be set for “smoke
alarm” as standard.
Compressor may experience a
low pressure.
Contact a service technician
Compressor overload trips Check compressor overload. Contact a
service technician.
Chilled water valve does
not open.
No call for cooling. Check temperature setpoint and deadband
(menu #4 and menu #28).
Inhibited by high condensate
water or no airflow alarm.
Correct the alarms.
Incorrect configuration on
compressor menu.
Check setting on Menu #44. It should be
set for “VALVE” for chilled water unit.
Loose connection on
connector or incorrect wiring.
Check connections between pin #5 of
Mini-DAP II to pin 5 of unit for cool.
relay fuse of panel is blown. Check Relay fuse on Mini-DAP II and
replace it with 5 amp fuse if necessary.
Smoke alarm goes off. Check and Reset the smoke detector.
Fire stat alarm activated. System is inhibited until return air temp is
below the fire stat limit on Menu #39.
Faulty cool 1
st
stage K2 relay. Use manual diagnostic relay test #2 to test
this relay. Check 24VAC between pin #3
and pin #5 of TB1.
Reheat does not come
on.
No call for reheat. Check temperature setpoint and
deadband.
Inhibited by high condensate
or no air flow alarm.
Correct the alarms.
Incorrect configuration. Check settings in Menu #45. It must be set
for “yes” if reheat is used.
Inhibited by humidification. Normal control logic for computer room
application. Refer to reheat control logic.
Loose connection. Refer to wiring diagram to check
connection.
relay fuse of panel is blown. Check relay fuse (5 amp fuse).
Faulty 1
st
stage reheat K4
relay.
Use manual diagnostic relay test #2 to
check the relay. Also check 24 VAC across
pin #3 and pin #7 on TB1 of Mini-DAP II.
Reheat thermal cutout switch
open.
Check thermal cutout switch located in the
reheat box assembly.
Humidification does not
come on.
No call for humidification. Check humidity setpoint and deadband.
Inhibited by high condensate
or no air flow alarm.
Correct the alarms.
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