START UP
IMPORTANT INSTALLER NOTE
For improved start up performance wash the indoor coil with a dish washing detergent.
CRANKCASE HEATERS
These units are not provided with crankcase heat. These units utilize scroll compressors which do not require crankcase heat in this application.
HIGH PRESSURE SWITCH
The models are supplied with a remote reset high pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again.
THREE PHASE SCROLL COMPRESSOR START UP INFORMATION
Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction.
However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a
Verification of proper rotation must be made at the time the equipment is put into service. If improper rotation is corrected at this time there will be no negative impact on the durability of the compressor. However, reverse operation for over one hour may have a negative impact on the bearing due to oil pump out.
NOTE: If compressor is allowed to run in reverse rotation for several minutes, the compressor’s internal protector will trip.
All three phase ZR3 compressors are wired identically internally. As a result, once the correct phasing is determined for a specific system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction.
The direction of rotation of the compressor may be changed by reversing any two line connections to the unit.
SERVICE HINTS
1.Caution homeowner to maintain clean air filters at all times. Also, not to needlessly close off supply and return air registers. This reduces air flow through the system, which shortens equipment service life as well as increasing operating costs.
2.Switching to heating cycle at 75° F or higher outside temperature may cause a nuisance trip of the remote reset high pressure switch. Turn thermostat off then on to reset the high pressure switch.
3.Check all power fuses or circuit breakers to be sure they are the correct rating.
4.Periodic cleaning of the outdoor coil to permit full and unrestricted airflow circulation is essential.
SEQUENCE OF OPERATION
COOLING – Circuit
COMPRESSOR CONTROL MODULE
The compressor control module is standard on the models covered by this manual. The compressor control is an
Adjustable Delay On Make And Break Timer
On initial power up or any time power is interrupted to the unit the delay on make period begins which will be 2 minutes plus 10% of the delay on break setting. When the delay on make is complete and the high pressure switch (and low pressure switch if employed) is closed, the compressor contactor is energized. Upon shutdown the delay or break timer starts and prevents restart until the delay on break and delay on make periods have expired.
During routine operation of the unit with no power interruptions the compressor will operate on demand with no delay.
Manual