Johnson Controls HVWHP072B32S - Page 99

SM-18006
 3-79
TROUBLESHOOTING
Connect them.
No
No
Are thermistors connected to
THM connector on W.S. PCB
(right table)?
Is resistance of thermistors
between 0.2kW and 840kW?
Yes
Yes
Failure of Thermistor
Failure of W.S. PCB
Te1,Te2:ThermistorforWaterSourceLiquidPipe1,2
Tchg:ThermistorforLiquidStopValve
Tsc:ThermistorforSupercoolingBypassLine
W.S.PCB:WaterSourceUnitPCB(PCB1)
l
 TheRUNindicator(red)ashes.
l
 Theindoorunitnumber(refrigerantcyclenumber-addressnumber),thealarmcode,themodelcode
1
,
the model name
1
andthenumberofconnectedindoorunitsaredisplayedontheLCD.Thealarmcode
andthewatersourceunitnumber/compressornumberwithanabnormalthermistoraredisplayedonthe
7-segmentdisplayofthewatersourceunitPCB.
Note1:Exceptforsomemodels.
Thisalarmisdisplayedwhenashort(0.2kΩorless)oropensensor(840kΩormore)isdetectedforeight
minutesduringoperation.
Alarm
Code
AbnormalityofThermistorforEvaporatingTemperature
duringHeatingOperation(WaterSourceUnitEvaporatingThermistor)
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Thermistor
for Evaporating
Temperature
during Heating
Check resistance.
Replace thermistor
if faulty.
Failure
Check wiring to
W.S. PCB.
Repair wiring and
connection.
Incorrect Connection
Replace W.S. PCB
and check operation.
Replace W.S. PCB
if faulty.
Failure of W.S. PCB
0.9V
1.4V
2.0V
2.6V
3.2V
3.6V
4.0V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
10
20
30
40
50
60
70
80
90
Output Voltage [VDC]
Ambient Temperature T [ºF (ºC)]
Thermistor Characteristics
Thermistor Resistance [kΩ]
Thermistor Resistance R
T
[kΩ]
0
(-18)
10
(-12)
20
(-7)
30
(-1)
40
(4)
50
(10)
60
(16)
R
25
= 200kΩ
(When T = 77ºF (25ºC), RT = 200kΩ
B = 3920K
R
T
= R
25
• exp B(1/T[K] - 1/298)
26.7kΩ
48.3kΩ
15.4kΩ
9.3kΩ
70
(21)
80
(27)
90
(32)
100
(38)
110
(43)
120
(49)
130
(54)
140
(60)
5.8kΩ
2.5kΩ
3.7kΩ
Output Voltage [VDC]
Model
ThermistorSymbol
(():ConnectorNo.)
Te1
(THM10)
Te2
(THM11)
Tchg
(THM17)
Tsc
(THM23)
(H,Y)VWH(P,R)072
-120B(3,4)2S
-
(H,Y)VWH(P,R)144
-216B(3,4)2S
NOTICE:
Thisdataisapplicabletothefollowingthermistors.
1. EnteringWaterTemperatureThermistor“Ta”(THM7)
2. EvaporationLiquidLineThermistor“Te1,Te2”
(THM10,11)
3. EvaporationGasLineThermistor“Tg”(THM12)
4. ElectricalBoxTemperatureThermistor“Ts”(THM14)
5. LiquidStopValveThermistor“Tchg”(THM17)
6. SubcoolerThermistor“Tsc”(THM23)