Control is uncalibrated when power is applied. Calibration occurs after a defrost cycle. The control initiates defrost after 34 minutes of accumulated compressor run time in heating with coil temperature below 35° F. The defrost cycle terminates when the coil sensor reaches termination temperature or after 14 minutes. Note: All units are shipped from the factory with the default termination temperature set at 70° F.
Defrost function is disabled if coil temperature is above 35° F. If the ambient sensor is detected as open or shorted, demand defrost will not operate and control will revert to time/temperature defrost operation. If the outdoor coil sensor is detected as open or shorted, the control will not perform demand or time/temperature defrost operation. Note: When the defrost cycle initiates, there will be a 30 second compressor delay going into and out of the defrost cycle. This delay may be removed by removing P6 connector on the board.
This
Diagnostic Description | LED Status | |
|
| |
Control Fault (No Power) | Off | |
Normal Operation | On | |
|
| |
ASCD Delay Active | 1 Flash | |
(with compressor demand) | ||
| ||
Low Pressure Switch Lockout | 2 Flashes | |
|
| |
High Pressure Switch Lockout | 3 Flashes | |
|
| |
Ambient Sensor Fault | 4 Flashes | |
|
| |
Coil Sensor Fault | 5 Flashes | |
|
|
Table 3. Control Diagnostic
Ambient Sensor Mounting
For optimum performance of the heat pump system, the ambient sensor (Figure 10) must be mounted on the outside of the unit.
1. Remove the mounting bracket and all hardware included in the packet .
2. R e m ove s t a r bu s h i n g f r o m 7 / 8 ” hole in cor ner panel of the unit .
3.Route the ambient sensor through the 7/8” hole in the corner panel of the unit, and then
through the 7/8” hole in the mounting bracket.
4. R o u t e t h e s e n s o r t h r o u g h t h e star bushing. Use the star bushing to secure the mounting bracket to the unit.
5.Secure the ambient sensor inside the plastic clip and secure it to the mounting bracket with the screw and nut provided.
6.Install one spacer next between the plastic clip and mounting bracket.
7.Bend the mounting bracket into position. Install the mounting bracket to the unit using the screw in the corner panel.
Nut |
Nut |
Bolt |
Ambient Sensor |
Plastic Clip |
Star Bushing |
Figure 10. Ambient Sensor Mounting
Electric Heat Package (optional)
This heat pump is shipped without an auxiliary electric heat kit installed.If electric heat is desired, an accessory Heater Kit must be fi eld installed. See Specifi cations Sheet for available kits and their application.
•Select the correct size heat package for the installation.
•Follow installation instructions provided with each heater kit.
•Installation is most easily accomplished before making duct or electrical connections.
•Refer to Table 2 (page 10) for blower speeds.
11
