Daikin DZ9VC - Heating Performance Analysis; Heating Troubleshooting Guide

19
AVOID CONTACT WITH THE
CHARGED AREA.
•N
EVER TOUCH THE
CHARGED AREA BEFORE CONFIRMING THAT THE RESIDUAL VOLTAGE IS 50 VOLTS OR LESS.
1. S
HUT DOWN THE POWER AND LEAVE
THE CONTROL BOX FOR
10 MINUTES.
2. M
AKE SURE TO TOUCH THE EARTH GROUND TERMINAL TO RELEASE THE STATIC ELECTRICITY FROM YOUR BODY (TO PREVENT FAILURE OF THE PC BOARD).
3. M
EASURE THE
RESIDUAL VOLTAGE IN THE SPECIFIED MEASUREMENT POSITION
USING A VOM WHILE PAYING ATTENTION NOT TO TOUCH
THE CHARGED AREA.
4. I
MMEDIATELY AFTER MEASURING THE
RESIDUAL VOLTAGE, DISCONNECT THE CONNECTORS OF THE OUTDOOR
UNIT’S FAN MOTOR. (IF THE FAN BLADE
ROTATES BY
STRONG WIND BLOWING AGAINST IT, THE CAPACITOR
WILL BE CHARGED, CAUSING THE DANGER OF ELECTRICAL SHOCK.)
WARNING
Outdoor Normal Temperature Operating Range: 17-62° F / Indoor Normal Temperature Operating Range: 65 - 85° F
POSSIBLE CAUSE
X IN ANALYSIS GUIDE INDICATE
"POSSIBLE CAUSE"
Comp discharge temp > 200F
Comp discharge temp < 105F
Comp discharge SH > 70F
Comp discharge SH < 20F
High pressure > 490psi
High pressure SSV< 270psi
High pressure LSV< 270psi
LSV SC > 12F
LSV SC < 4F
Low pressure < 40psi
Requested % demand < Actual %
Requested % demand > Actual %
Repeated stop/start
Weak heating
No switch heating
Noise
Incomplete defrost operation
Stop operation
Sweating liquid line
Liquid stop valve does not fully open
X X X X X X X X X X
Gas stop valve does not fully open
X X X X X X X X X
Line set restriction
X X X X X X X X X X
Line set length is too long
X X X
Blocked filter-dryer
X X X X X X X X X X
OD EEV coil failure
X X X X X X X X X X X X X X X X
OD EEV failure
X X X X X X X X X X X X X X X X
ID EEV coil failure
X X X X X X X X X X X X X
ID EEV failure
X X X X X X X X X X X X X
Check valve failure – Leakage
X X X X X X X
High Pressure switch failure
X
Pressure sensor failure
X X X X X X X X X X X X
Discharge temp sensor failure
X X X X X X X X X
Coil temp sensor failure
X X X X X X
Defrost sensor failure
X X X X X X
Liquid temp sensor failure
X X X X
Ambient temp sensor failure
X X X X X X X
OD recirculation
X X X X X X X X
ID recirculation
X X X X X X
Dirty OD Heat-exchanger
X X X X X X X X
Dirty ID Heat-exchanger
X X X X X X
Outdoor Ambient temp is too high
X X X X X X
Outdoor Ambient temp is too low
X X X X X X X X X X
ID suction temp is too high
X X X X X
ID suction temp is too low
X X X
Mixture of non-condensible gas
X X X X X X X X
OD fan motor failure
X X X X X X X
RV failure
X X X X X X X X X
RV coil failure
X X X X X X X X X
Over charge
X X X X X X X X X X
Under charge
X X X X X X X X X X
Leak
X X X X X X X X X X
TXV failure
X X X X X X X X
TXV size is small
X
TXV size is big
ID failure
X X X X X X X X X X X X X X X X X X
OD Control Board failure
X
Compressor failure
X X X X X X X X X X X X
Cooling loop is not attached
X X X
Cooling loop grease is not enough
X X X
Compressor and Gas furnace are operating at the same time
X X
Low ID CFM
X X X X X X X
HEATING ANALYSIS CHART