York Heat Pump: Yorkguard VI

Re: Pipe Freeze Protection (Heating)

The status lights on the module will indicate as follows: Red = 7, Green = Off.

• The Pipe Freeze Protection alert is activated when there has been a continuous call for auxiliary heat in excess of 60 minutes.
• This alert is intended to warn of potential indoor water pipe freezing (assumes that the house is not being heated).

CHECKOUT:

1. Check Low Voltage

• At the Yorkguard VI (outdoor unit), check for a call for Aux Ht from the thermostat.
  • Check for 24VAC between "W" and "C".
    • No Voltage = No Call for Aux Heat ⇒ Recheck the thermostat to see if it is calling for Aux Heat 
    • Voltage Present ⇒ Check for 24VAC between "W1 Out" and "C".
      • Voltage Present → Step 2. Check Heaters
      • No Voltage ⇒ Check Balance Point setting (Outdoor temperature must be below the "Balance Point" for Aux Ht to operate).
        • 24V on W1 + Outdoor Temp Below Balance Point + No Voltage on W1 Out = Bad Yorkguard VI

2. Check Heaters

• Check Low Voltage 
• Check for 24VAC between "W1" and "C", also between "W2" and "C".
  • ​​​​​​​Voltage Present ⇒ Check Heater Amperage (below)
  • No Voltage (inside) + Voltage on "W1 Out" (outside) = Bad Low Voltage Wires or Wiring
• Check Heater Amperage
• Use an Amp Probe to check amperage of each heater (W1-only will energize partial heaters, W1 + W2 should energize all heaters).
  • No or Partial Amperage ⇒ Check High Voltage Power (below)
  • Amperage on All Heaters → Step 4. Check Temperatures
• Check High Voltage Power
• Check for 200 - 230VAC between each leg at the exiting power of each air handler breaker.
  • Voltage Present + No Amperage → Step 3. Check Heaters/Relays
  • No or Partial Voltage ⇒ Check the breaker inlet power

3. Check Heaters / Relays

• Check Relays
• Check for 24VDC at the coil of each heater relay.
  • ​​​​​​​24VDC Present + High Voltage Power + No Heater Amperage ⇒ Check Heater (below)
  • No 24VDC Present = Bad Heater Board or Heater Board Locked-Out ⇒ Check board for diagnostic light
• ​​​​​​​Check Heater
• Check for 200 - 230VAC between the two ends of each heater.
  • ​​​​​​​No Power + Relay Energized = Bad Relay
  • Power + No Amperage = Bad Heater

4. Check Temperatures

• With the blower operating, check the Return and Supply Air Temperature at the air handler.
• Look for an unusually cold Return Air Temperature (indicating Open Return Ductwork in an attic or crawlspace).