START-UP
CRANKCASE HEATER
CAUTION: DO NOT ATTEMPT TO START THE COMPRES- SOR WITHOUT AT LEAST 8 HOURS OF CRANKCASE HEAT OR COMPRESSOR DAM- AGE WILL OCCUR.
PRE-START CHECK
1.Have sufficient clearances been provided?
2.Has all foreign matter been removed from the interior of the unit (tools, construction or shipping materials, etc.)?
3.Have the outdoor fans been rotated manually to check for free rotation?
4.Are all wiring connections tight?
5.Does the available power supply agree with the nameplate data on the unit?
6.Have the fuses, disconnect switch and power wire been sized properly?
7.Are all compressor
8.Are any refrigerant lines touching each other or any sheet metal surface? Rubbing due to vibration could cause a re- frigerant leak.
9.Are there any visible signs of a refrigerant leak, such as oil residue?
10.Is any electrical wire laying against a hot refrigerant line? Keep in mind that this unit has a reverse cycle and that dif- ferent lines will be hot during the “HEAT” and “COOL” cy- cles. Only two lines will remain cool for all cycles - the line between the compressor and the accumulator and the line between the accumulator and the reversing valve.
INITIAL START-UP
1.Supply power to the unit through the disconnect switch prior to starting the compressor.
2.Move the system switch on the room thermostat to the “COOL” position, and lower its set point to energize both the compressor and the reversing valve. Cool air will be supplied to the conditioned space.
Check the compressor amperage. It should not exceed the RLA rating printed on the unit data plate or in Table 3 unless the ambient temperature is above 105°F.
4.Move the system switch on the room thermostat to the “HEAT” position, and increase the set point of the room thermostat until heating is required. The compressor will run, but the reversing valve will be
5.Check the operation of the indoor unit per Form
6.Check the entire system for refrigerant leaks.
7.Check for any abnormal noises and/or vibrations, and make the necessary adjustments to correct (e.g. fan blade touching shroud, refrigerant lines hitting on sheet metal, etc.)
8.After the unit has been operating for several minutes, shut off the main power supply at the disconnect switch and in- spect all factory wiring connections and bolted surfaces for tightness.
SAFETY FEATURES
1.All outdoor fan motors have inherent protection with auto- matic reset.
2.Every compressor is internally protected against excessive current and temperature by a line break motor protector that is mounted inside the compressor housing and is connected between each winding and the common terminal.
This motor protector will interrupt power to the compressor if any of the following overload conditions occur:
a.primary single phasing
b.locked rotor
c.compressor overload
d.insufficient motor cooling
This type of motor protection works even with the contac- tor welded closed.
3.Every compressor is protected by crankcase heaters to prevent refrigerant from accumulating in the crankcases of the compressor during an “OFF” cycle.
4.Outdoor fan motors and the secondary of the control trans- former are grounded.
5.A fusible plug on the top of the suction line accumulator serves as a high temperature/high pressure relief device.
CAUTION:
DO NOT ATTEMPT TO START THE COMPRESSOR WITHOUT AT LEAST 8 HOURS OF CRANKCASE HEAT OR COMPRESSOR DAMAGE WILL OCCUR.
SECURE OWNER'S APPROVAL: When the system is functioning properly, secure the owner's approval. Show him the location of all disconnect switches and the thermostat Teach him how to start and stop the unit, how to adjust temperature settings within the limitations of the system, how the defrost cycle is controlled and how the
| MAINTENANCE |
CLEANING | .REPLACEMENT PARTS |
NOTICE TO OWNER
LUBRICATION
Unitary Products Group | 15 |