Troubleshooting - Johnson Controls RJ H Series Installation Operation & Maintenance

RJ SERIES INSTALLATION MANUAL

Troubleshooting

Standard Microprocessor Controls
To check the unit control board for proper operation:
1) Disconnect thermostat wires at the control board.
2) Jumper the desired test input (Y1, Y2, W, O or G) to the R terminal to simulate a thermostat signal.
3) If control functions properly:
• Check for thermostat and field control wiring (use the diagnostic inputs mode).
4) If control responds improperly:
• Ensure that component being controlled is functioning (compressor, blower, reversing valve, etc.).
• Ensure that wiring from control to the component is functioning (refer to the LED Definition table below and use
the diagnostic outputs mode).
• If steps above check properly, replace unit control.
LED Definitions and Diagnostics
Standard Microprocessor
NORMAL
LED
DISPLAY MODE
Field Selection DIPS
SW2-
SW2-
SW2-
Drain Pan Overflow
Drain
Lockout
Freeze Detection
Thermistor (Loop
Water Flow
<15°F, Well<30°F)
Lockout
High
High Pressure >600
Pressure
PSI Lockout
Low
Low Pressure <40 PSI
Pressure Lockout
Airflow
ECM2 RPM <100 RPM
Microprocessor
Status
Malfunction
DHW Limit
HWL Thermistor >130°
DHW Pump
DHW Off
Switch Off
Refrigerant Systems
To maintain sealed circuit integrity, do not install service gauges unless unit operation appears abnormal. Compare the change in
temperature on the air side as well as the water side to the Unit Operating Parameters tables. If the unit's performance is not within the
ranges listed, and the airflow and water flow are known to be correct, gauges should then be installed and superheat and subcooling
numbers calculated. If superheat and subcooling are outside recommended ranges, an adjustment to the refrigerant charge may be
necessary.
Note: Refrigerant tests must be made with hot water generator turned "OFF". Verify that air and water flow rates are at proper levels before
servicing the refrigerant circuit.
CURRENT
FAULT STATUS
1 On SW2- 1 Off
6 On SW2- 6 On
7 On SW2- 7 On
Drain Pan Overflow
Freeze Detection
Thermistor (Loop
<15°F, Well<30°F)
High Pressure >600
Low Pressure <40
ECM2 RPM
<100 RPM
Not Used
HWL Thermistor
>130°F
DHW Pump
Switch Off
DIAGNOSTIC MODES
INPUTS OUTPUTS 1
SW2- 1 NA SW2-
SW2- 6 Off SW2-
SW2- 7 On SW2-
Compressor
Y1
(On or Low)
Compressor
Y2
(On or High)
O Reversing Valve
G
W DHW Pump
SL1 Loop Pump(s)
Not Used
–
34
OUTPUTS 2
1 NA SW2-
6 On SW2-
7 Off SW2-
Blower
Low
Blower
Medium
Blower
High
Fan Aux Heat 1
Aux Heat 2
Aux Heat 3
– Aux Heat 4
– –
1 NA
6 Off
7 Off