Classic HVPA & HVPSA M&S 8.09-1
15700 - 6
HVAC Equipment
4. Set the time delay in the
Classic™ Heat Pump with Economizer
control box to
3 minutes. Check the enthalpy changeover setting of the H205A or dry bulb sensor,
and reset it if needed. Refer to the Owner’s manual for instructions on setting the
H205A or dry bulb sensor.
5. Slowly lower the thermostat’s cooling temperature. The indoor fan should operate.
Once the indoor fan comes on, allow approximately three minutes for the compressor
to start. Note that the outdoor fan may not come on immediately because it is
cycled by refrigerant pressures
Note: To check the system operation under different ambient conditions, the air
temperature and enthalpy sensors must be "tricked". When outdoor ambient
conditions are higher than the control setting, a component aerosol cooler may be
sprayed directly into the enthalpy sensor to simulate low enthalpy conditions, causing
the economizer damper to open.
Alternately, when outdoor conditions are lower than the set point, a source of heat
such as a hair dryer can be directed on the air temperature sensor to simulate warmer
conditions, which will bring on mechanical cooling and start the compressor.
If the unit fails to operate, refer to the troubleshooting information in Chapter 6.1.
Check-Out of Heating Cycle
Procedure:
1. Place the thermostat system switch to "Auto" or "Heat" and the fan to "Auto".
2. Raise the heating temperature to a setting which is higher than the room
temperature. The fan and compressor should cycle on after time delay (standard on
Classic™ heat pump with economizer and all HVP models, option on all other Classic
units) has cycled.
3. Move the system switch to the "Off" position. All functions should stop.
The Blower Timed Delay Relay (BTR) keeps the blower running for 90 seconds after
the unit shuts off.
Note: The damper blade should remain closed during the heating cycle (unless the
minimum position potentiometer has been set for constant ventilation).
