Johnson Controls RJ H Series, Installation Operation & Maintenance

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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.
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.
LED
NORMAL
DISPLAY MODE
DIAGNOSTIC MODES
CURRENT
FAULT STATUS
INPUTS OUTPUTS 1 OUTPUTS 2
Field Selection DIPS
SW2- 1 On SW2- 1 Off SW2- 1 NA SW2- 1 NA SW2- 1 NA
SW2- 6 On SW2- 6 On SW2- 6 Off SW2- 6 On SW2- 6 Off
SW2- 7 On SW2- 7 On SW2- 7 On SW2- 7 Off SW2- 7 Off
Drain
Drain Pan Overflow
Lockout
Drain Pan Overflow Y1
Compressor
(On or Low)
Blower
Low
Water Flow
Freeze Detection
Thermistor (Loop
<15°F, Well<30°F)
Lockout
Freeze Detection
Thermistor (Loop
<15°F, Well<30°F)
Y2
Compressor
(On or High)
Blower
Medium
High
Pressure
High Pressure >600
PSI Lockout
High Pressure >600 O Reversing Valve
Blower
High
Low
Pressure
Low Pressure <40 PSI
Lockout
Low Pressure <40 G Fan Aux Heat 1
Airflow
ECM2 RPM <100 RPM
ECM2 RPM
<100 RPM
W DHW Pump Aux Heat 2
Status
Microprocessor
Malfunction
Not Used SL1 Loop Pump(s) Aux Heat 3
DHW Limit
HWL Thermistor >130°
HWL Thermistor
>130°F
Not Used – Aux Heat 4
DHW Off
DHW Pump
Switch Off
DHW Pump
Switch Off
– – –
LED Definitions and Diagnostics
Standard Microprocessor