CONTROLLER DETAILS
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Booster Compressor Protection:
The Booster Compressor cannot be operated without the Primary Compressor running with 2 Cylinders. The Booster
Compressor will be allowed to operate, when dictated by the operating mode, only if the Primary Compressor is running with 2
Cylinders.
The maximum accumulated runtime with the Booster Compressor is 2 hours. Once this time limit is reached, the Controller
shall shut down the heat pump outputs for 10 minutes and if the demand call exists during this time, the Controller shall meet
the demand by energizing the Auxiliary Heat output (W1Out) and indoor air handler fan high speed output (Y2Out). The
Controller shall display this operating mode as Heat Mode 7 (H7) on the display. Time for the compressors shall be accumulated
whenever any compressor is on. If the Booster Compressor comes on at any time, then if any compressor is on for 2 hours,
there is a 10 minute rest period.
CONTROLLER TIMERS
1. Temperature Stability Timer (5 Minutes) – In order for the system to change operational BINs from one to another, the system
must sense a temperature change to the new BIN for at least five minutes.
2. Defrost Lockout Timer (45 Minutes) – This timer prevents the system from going into another defrost within 45 minutes of the
prior defrost.
3. Y2 Validation Timer (1 Minute) – The Acadia outdoor unit must have a Y2 call from the thermostat for at least 1 minute before
it will change modes. This will prohibit a nuisance mode changing of the system operation.
4. Anti-Short Cycle Timer (3 minutes) Prevents the short cycling of the compressor(s).
5. Maximum Defrost Timer (8 Minutes) – Maximum allowable time for a defrost cycle.
6. Minimum Defrost Timer (3 Minutes) – Minimum allowable time for a defrost cycle.
7. Fault Restart Timer (10 Minutes) – If the controller senses a fault, it will standby for 10 minutes before attempting to restart.
(NOTE) Any fault recurring three times withiCall for Service
the thermostat.
8. Defrost Fan Purge Timer (20 seconds) – A 20 second timer is used at the end of a defrost cycle to help remove water droplets
from the outdoor coil. (The reversing valve will cycle at the end of the fan purge and ends defrost.)
(NOTE) In addition to the above timers, the Acadia Heat Pump utilizes many proprietary timers to ensure proper and efficient
operation of the system. If there are any questions about how the system is operating, contact Hallowell International Technical
Support.
UTILITY LOAD SHED
If the Utility grid reliability is in danger, the Utility could be able to close a contact on the Load Shed input and shut down the Heat
Pump. If the Load Shed input is utilized continuously for 3 seconds, the Controller goes into Standby, not allowing the heat pump
outputs to be energized even if there is a demand call. Emergency Heat Mode is allowed in Load Shed. The Utility Load Shed code is
indicated on the display. If the Load Shed input is utilized during defrost, the Controller shall complete defrost, and if at the end of
defrost, the input is still utilized, then the Controller will shut down the Heat Pump and go to Standby. The Controller will recover
from the Utility Load Shed if the input is not used for 3 seconds. The maximum duration Load Shed is 2 hours. If the Load Shed
input is utilized after 2 hours, the Controller returns to normal operation. Whenever the Controller returns to normal operation
from the Utility Load Shed, it does so in a random amount of time, 0 to 15 minutes, after the time out or the input is de-utilized.
(NOTE) The X/L output is NOT energized in the Utility Load Shed.
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