12/03/2012
43
GI301
Troubleshooting – General
WARNING – Refrigerant Evacuation
WHEN REFRIGERANT IS EVACUATED FROM A UNIT WITHOUT ANTIFREEZE IN THE WATER TO
REFRIGERANT HEAT EXCHANGERS,
WATER IN THE UNPROTECTED HEAT EXCHANGER
MUST BE REMOVED OR CONTINUOUSLY FLOWING TO AVOID A POTENTIAL HEAT
EXCHANGER FAILURE CAUSED BY FREEZE RUPTURE.
FLOWING WATER THROUGH THE
HEAT EXCHANGERS EVEN IF ANTIFREEZE PROTECTED WILL SPEED THE EVACUATION
PROCESS.
Troubleshooting Guide for Water-to-Water Geothermal “Heating”
Head
pressure
Subcool
Suction
pressure
Superheat Compressor
Amp draw
Load temp
differential
Source temp
differential
Undercharged system
Low Low Low High Low Low Low
Overcharged system
High High High Low High High High
Low load flow
High Low High High High High Low
High load flow
Low Low High High High Low High
Low source flow
Low High Low Low Low Low High
High source flow
High Low High High High High Low
Low return load
temperature
Low High Low Low Low High High
High return load
temperature
High Low High High High Low Low
Scaled source coil
Low High Low Low Low Low Low
Restricted filter/drier
Low High Low High Low Low Low
Bad TXV / No Bulb
charge
Low High Low High Low Low Low
Troubleshooting Guide for Water-to-Water Geothermal “cooling”
Head
pressure
Subcool Suction
pressure
Superheat Compressor
Amp draw
Load temp
differential
Source temp
differential
Undercharged system
Low Low Low High Low Low Low
Overcharged system
High High High Low High Low Low
Low load flow
Low High Low Low Low High Low
High load flow
Low Low High High High Low High
Low source flow
High Low High High High Low High
High source flow
Low High Low Low Low High Low
Low return load
temperature
Low High Low Low Low Low Low
High return load
temperature
High Low High High High Low High
Scaled source coil
High Low High High High Low Low
Restricted filter/drier
Low High Low High Low Low Low
Bad TXV / No Bulb
charge
Low High Low High Low Low Low
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