WaterFurnace Envision2 - Manual (Page 48)

48
ENVISION 2 COMPACT - 50 HZ INSTALLATION MANUAL
Should a major problem develop, refer to the following
information for possible causes and corrective steps.
If compressor won’t run:
1. The fuse may be open or the circuit breaker is tripped.
Check electrical circuits and motor windings for shorts
or grounds. Investigate for possible overloading. Replace
fuse or reset circuit breakers after fault is corrected.
2. Supply voltage may be too low. Check it with a
volt meter.
3. Control system may be faulty. Check control for correct
wiring of thermostat or aquastat and check the 24 volt
transformer for proper voltage.
4. Wires may be loose or broken. Replace or tighten.
5. The low pressure switch may have tripped due to one or
more of the following:
a) Heating
1) Plugged heat exchanger on source side
2) Water flow source side - (Low)
3) Water too cold source side
4) Low refrigerant
b) Cooling
1) Plugged heat exchanger on load side
2) Water flow load side - (Low)
3) Water too cold load side
4) Low refrigerant
6. The high pressure switch may have tripped due to one
or more of the following:
a) Heating
1) Plugged heat exchanger on load side
2) Low water flow load side
3) Water too warm load side
b) Cooling
1) Plugged heat exchanger on source side
2) Low water flow on source side
3) Water too warm source side
7. The compressor overload protection may be open.
8. The internal winding of the compressor motor may
be grounded to the compressor shell. If so, replace
the compressor.
9. The compressor winding may be open or shorted.
Disconnect power. Check continuity with ohm meter. If
the winding is open, replace the compressor.
If sufficient cooling or heating is not obtained:
1. Check control for improper location or setting.
2. Check for restriction in water flow.
3. Check refrigerant subcooling and superheat for proper
refrigerant charge and expansion valve operation.
4. The reversing valve may be defective and creating a
bypass of refrigerant. If the unit will not heat, check the
reversing valve coil.
If the unit operation is noisy:
1. Check compressor for loosened mounting bolts. Make
sure compressor is floating free on its isolator mounts.
Check for tubing contact with the compressor or other
surfaces. Readjust it by bending slightly.
2. Check screws on all panels.
3. Check for chattering or humming in the contactor or
relays due to low voltage or a defective holding coil.
Replace the component.
4. Check for proper installation of vibration absorbing
material under the unit.
5. Check for abnormally high discharge pressures.
6. Compressor rotation incorrect
Aurora Control System
NOTE: Refer to the Aurora Base Control Application and
Troubleshooting Guide and the Instruction Guide: Aurora
Interface and Diagnostics (AID) Tool for additional information.
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 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.
Troubleshooting