90
Cypress Confidential
Verify HVAC operation using the WPT (DA)
1. Adjust WPT setpoint to 55 degree and wait and watch.
2. Check Branch pressure
• A direct acting thermostat will be in cooling mode and will build branch pressure (verify
pressure is at 15 lbs or higher)
• A/C actuator will start to open fully (at around 13 lbs)
• You should see the supply air temp drop to 65 degree or lower (check with an IR
temperature gun)
3. Adjust WPT setpoint to 85 degree and wait and watch.
4. Check Branch pressure
• A direct acting thermostat will be in heating mode and branch pressure will drop to 0
lbs.
• At around 5 lbs the heating valve should open and air temp should warm up.
• At 0 lbs the valve is open full and the supply air temp should warm to 90 degree or
higher (check with an IR temperature gun)
If branch pressure will not build on the WPT
• Loosen and lift WPT off wall bracket, as you pull away from wall look behind WPT
to check for kinked main air line.
• Remove branch line and place your finger over the port and repeat # 2 above.
• If pressure will build with your finger over the port, then there is a possible branch line
leak.
• If there is no pressure, then replace the WPT and return the unit
To Next Page
Loading...
