THERMOSTAT: This application uses a Honeywell VisionPro Thermostat to control a 3-stage heat, 2-stage cool Heat Pump with a Variable Speed Air Handler.
- Cannot use a FocusPro 5000 thermostat
- It is possible to upgrade to a Prestige Thermostat
SCHEDULE: The VisionPro thermostat is pre-configured as Programmable and has a default schedule with all temperatures set for 68 deg. Heat, 74 deg. Cool. However, the thermostat has the option to be Programmable or Non-Programmable.
To change the Schedule Options:
- From the Home Screen press "MENU"
- Scroll down to highlight and Select "Preferences"
- Scroll down to highlight and Select "Scheduling Options"
- Select Programmable or Non-Programmable
WIRING: The 5 ton YHJF is different from all other models because it uses a 2-Stage Scroll Compressor and has a Yorkguard VI control module instead of a standard Demand Defrost control. Therefore, there are several important points to watch for on the wiring.
- The "Y" output from the thermostat connect to "Y1" at the air handler and "Y1" at the outdoor unit.
- The Condensate Overflow Switch must be wired as-shown to break the "Y1" signal to the outdoor unit.
- When the Condensate Overflow Switch trips, the Yorkguard may generate a "Y2 Present without Y!" fault when the thermostat calls for 2nd stage cooling.
- The "Y2" output from the thermostat does not connect to the air handler control board. It wire-nuts at the air handler and ties to "Y2" at the outdoor unit.
- The "Y2 Out" output from the outdoor unit ties to "Y2" at the air handler (tells the air handler to run high speed).
- Based on operating conditions, there may be times that the Yorkguard energizes 2nd stage compressor and hi speed indoor fan even though the thermostat is calling for 1st stage.
- Based on operating conditions, there may be times that the Yorkguard runs 2nd stage compressor and low speed indoor fan.
- The "W" or "Aux" output from the thermostat does not connect to the air handler control board. It wire-nuts at the air handler and ties to "W" at the outdoor unit.
- The "W1 Out" output connects to "W1" at the air handler.
- The "W2 Out" output connects to "W2" at the air handler.
FAN SPEEDS: Fan speed selection on the air handler is done by setting dip switches on the air handler control board.
HUMIDIFIER: The thermostat is pre-configured to control a Bypass Humidifier (if applicable).
- To control a humidifier from the thermostat, a field jumper must be installed between "Rc" and "U1" at the thermostat.
- The humidity setpoint is accessed by selecting "Preferences" from the home screen, then "Humidity".
- If no humidifier is present, the Humidifier Mode should be set to "Off"
IMPORTANT NOTE: The "HUM" terminal and "Humidistat" jumper on the air handler control board are not for Humidifier operation or control. They are for control of De-Humidification and cause the blower speed to decrease in the cooling mode.