START-UP
CRANKCASE HEATER | 4. | Move the system switch on the room thermostat to the | |
The crankcase heaters must be energized at least 8 hours bef- |
| “HEAT” position, and increase the set point of the room | |
| thermostat until heating is required. The compressor will | ||
ore starting the compressor. To energize the crankcase heat- |
| run, but the reversing valve will be | |
ers, the main disconnect switch must be closed. During this 8 |
| will be supplied to the conditioned space. | |
hour period, the system switch on the room thermostat must be | 5. | Check the operation of the indoor unit per | |
“OFF” to prevent the compressor from starting. | |||
| Form | ||
CAUTION: DO NOT ATTEMPT TO START THE COM- |
| ||
6. | Check the entire system for refrigerant leaks. | ||
PRESSOR WITHOUT AT LEAST 8 HOURS OF | |||
7. | Check for any abnormal noises and/or vibrations, and make | ||
CRANKCASE HEAT OR COMPRESSOR DAM- | |||
AGE WILL OCCUR. |
| the necessary adjustments to correct (e.g. fan blade touching | |
|
| shroud, refrigerant lines hitting on sheet metal, etc.) |
Make sure that the bottom of the compressor is warm to the touch to prove crankcase heater operation.
PRE-START CHECK
Before starting the unit, complete the following check list:
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.
3.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.
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:
CAUTION:
DO NOT ATTEMPT TO START THE
COMPRESSOR WITHOUT AT LEAST 8 HOURS OF CRANKCASE HEAT OR COMPRESSOR DAMAGE WILL OCCUR.
a. primary single phasing b. locked rotor
c. compressor overload
d. insufficient motor cooling
This type of motor protection works even with the contactor 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.
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
MAINTENANCE
CLEANING
Do not allow dirt to accumulate on the outdoor coil. Clean the coil with a brush or vacuum cleaner as often as necessary to assure good system performance and efficient operation. If the coil is extremely dirty, it may be necessary to use an in- dustrial grade detergent and a hose to clean the fin surface.
LUBRICATION
The outdoor fan motors are equipped with factory lubricated and sealed ball bearings. They do not require any mainte- nance.
REPLACEMENT PARTS
Contact your local UPG Distribution Center for replacement compressors, fan motors, controls, etc.
NOTICE TO OWNER
If a lockout occurs, check the indoor filters and the outdoor coil before calling a serviceman. If the filters are dirty, clean or re- place them. If there is an accumulation of snow, leaves or debris blocking the outdoor air coil, remove the blockage. Reset the thermostat and wait 5 minutes. If the unit doesn't start, call a serviceman.
14 | Unitary Products Group |
