
FORM 150.67-NM2 (209)
187
JOHNSON CONTROLS
9
PROBLEM
CAUSE
SOLUTION
“LOW SUCTION PRESSURE”
4. TXV defective.
4. Replace TXV.
FAULT (CONT’D)
5.
Reduced
fl ow of chilled
5. Check GPM (See “Limita
tions” liquid through the
cooler
in Installation section).
Check operation of pump,
clean pump strainer, purge
chilled liquid system of air.
6. Defective suction pressure
6. Replace transducer/low
transducer/low pressure
pressure switch or faulty
switch or wiring.
wiring. Refer to “Service”
section
for
pressure/voltage
formula.
7. LLSV defective
7. Replace LLSV
“HIGH DISCHARGE
1. Condenser fans not operating
1. Check fan motor,
PRESSURE” FAULT
or operating backwards.
and contactors. Assure fan
blows
air
upward.
2. Too much refrigerant.
2. Remove refrigerant.
3. Air in refrigerant system.
3. Evacuate and recharge
system.
4. Defective discharge
4. Replace discharge pressure
pressure transducer.
transducer. Refer to Service
section
for
pressure/voltage
formula.
“LOW LIQUID TEMP”
1. Improperly adjusted leaving
1. Re-program the leaving
FAULT
chilled liquid temp. cutout
chilled liquid temp. cutout.
(glycol
only).
2. Micro panel setpoint/range
2. Re-adjust setpoint/range.
values improperly programmed.
3.
Chilled
liquid
fl ow too low.
3. Increase chilled liquid fl ow –
refer to Limitations in Instal-
lation
section.
4. Defective LWT or RWT sensor
4. Compare sensor against a
(assure the sensor is properly
known good temperature
installed in the bottom of the well
sensing device. Refer to
with a generous amount of heat)
Service section for temp./
conductive
compound).
voltage
table.
CONT’D
TROUBLESHOOTING (CONT’D)
Содержание YCAL0019
Страница 55: ...FORM 150 67 NM2 209 55 JOHNSON CONTROLS 5 5 ELEMENTARY WIRING DIAGRAM CON T LD12699D...
Страница 57: ...FORM 150 67 NM2 209 57 JOHNSON CONTROLS 5 5 ELEMENTARY WIRING DIAGRAM CON T LD12693C...
Страница 59: ...FORM 150 67 NM2 209 59 JOHNSON CONTROLS 5 5 ELEMENTARY WIRING DIAGRAM CON T LD 12198...
Страница 61: ...FORM 150 67 NM2 209 61 JOHNSON CONTROLS 5 5 LD12702 ELEMENTARY WIRING DIAGRAM CON T...
Страница 63: ...FORM 150 67 NM2 209 63 JOHNSON CONTROLS 5 5 LD12696 ELEMENTARY WIRING DIAGRAM CON T...
Страница 65: ...FORM 150 67 NM2 209 65 JOHNSON CONTROLS 5 5 CONNECTION WIRING DIAGRAM CON T LD12703B...
Страница 67: ...FORM 150 67 NM2 209 67 JOHNSON CONTROLS 5 5 CONNECTION WIRING DIAGRAM CON T LD12697B...