Climatemaster - Heating Operating Conditions

Geothermal: Heating

Re: Heating Equipment Operating Conditions

Climatemaster produces a very detailed chart that shows accurate temperatures and refrigerant pressures for different operating conditions.

In order to use this chart, the technician must retrieve and record the following operating data:

1. Check Loop Water

• Pumps
• Use an Amp Probe to check amperage on each loop pump to ensure that they are operating.
  • Pumps should start with the compressor.
  • Each pump should draw .7 to .8 amps.
• Pressure Drop
• Use a Pressure Gauge to check the water pressure drop through the unit.
  • Use performance chart to calculate and record the GPM/Ton.
    • No Pressure or Negative Pressure = Low Water
• Temperature Drop
• Use a thermometer to check the water temperature drop across the unit while the compressor is operating at full capacity.
  • Check and record the inlet water temperature.
  • Check the outlet water temperature.
    • Calculate and record the water temperature drop.

2. Check Refrigerant Pressures

• Hook-up refrigerant gauges to the pressure ports on the unit.
  • Blue --> "True Suction" Low Pressure
  • Red --> High Pressure
• Place an insulated temperature sensor on the liquid line between the evaporator coil and expansion valve.
• Monitor and record the pressures as the system operates.
• Calculate and record the "Sub-Cooling".
  • Check "Saturation Temperature" from the discharge pressure gauge.
  • Subtract the Actual liquid line temperature reading.
    • Saturation Temp - Liquid Line Temp = Sub-Cooling

• (Split-Systems) If a Liquid-Line Sight Glass is installed, observe for bubbles in the sight glass (after the system has been operating for at least 5 min.)

3. Check Air Temperature Rise

• With the auxiliary heaters disconnected (remove "W" from the low voltage terminal block):
  • Check the Return Air Temperature near the unit or in the filter compartment.
  • Check the Supply Air Temperature.
  • Calculate and record the air temperature rise.
  • RE-HOOK THE "W" WIRE ON THE CONTROL BOARD.