Johnson Controls HVWHP072B32S - Page 66

3-46
SM-18006
TROUBLESHOOTING
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Activation of
High Pressure
Switch due to
Excessively
High Discharge
Pressure
Clogging of Heat
Exchanger?
Remove clogging.
Clogging of
Water Strainer?
Remove clogging.
Check for dust on
air filter.
Remove dust.
Check for any obstacles
at inlet or outlet of
heat exchanger.
Remove obstacles.
Check service space is
sufficient for Indoor Unit
Secure sufficient
service space.
Check fan motor speed.
[Indoor Fan: Heating]
Replace fan motor
if faulty.
Check Water Flow
and Water Cycle
Correctly adjust
Water Flow
Insufficient Water Flow or
Airflow to Heat Exchanger
(Water Source Heat
Exchanger during
Cooling Operation or
Indoor Heat Exchanger
during Heating Operation)
Check thermistor for
indoor unit inlet air temp.
and water source unit
entering water temp.
Replace thermistor
if faulty.
Excessively High Indoor
Unit Inlet Air Temp. and
Water Source Unit Entering
Water Temp.
Check the Additional
Refrigerant Charge
Calculation
Charge correct amount
of refrigerant.
Insufficient Refrigerant
Check electrical system
and ref. cycle.
Correctly connect them.
Incorrect Connection
between Indoor Unit and
Water Source Unit
Check connector for
W.S. PCB.
Repair connector for W.S.
PCB or expansion valve.
Replace it if faulty.
Locked Expansion Valve
(Fully Closed)
Check stop valve. Open stop valve.Closed Stop Valve
No
No
Yes
Yes
No
Yes
Are connectors in
the table 2 connected
correctly?
Faulty Inverter PCB (INV).
Replace it.
Attach the connectors correctly.
Normal inverter
PCB
Connect the terminals correctly.
Check activation of the following
safety devices.
Remove the cause after checking.
● High Pressure Switch (PSH):
602 psi (4.15MPa)
Do connectors in
the table 2 have continuity
when the water source
unit stops operating.
Is the terminal correctly
connected to the high pressure
switch on the discharge pipe?
■460VType
Table 2. Connector Number
PCB InverterPCB(INV)
Connector PCN2
Pin No. #1, #3
W.S. PCB: Water Source Unit PCB (PCB1)