Carrier 50PG03-07 Especificações descarregar pdf (Página 29)

PRE-START-UP START-UP

Failure to observe the following warnings could result in

serious pel_onal injuu:

1. Follow recognized safety practices and wear protec-

tive goggles when checking or servicing refi'igerant

system.

2. Do not operate compressor or provide any electric

power to unit unless compressor termimd cover is in

place and secured.

3. Do not remove complessor terminal cover until all

electrical sources ale disconnected and properly

tagged.

4. Relieve all plessure from system before touching or

distmbing anything inside terminal box if refrigerant

leak is suspected around complessor terminals. Use

accepted methods to recover refrigerant.

5. Never attempt to repair soldered connection while re-

fiigemnt system is under pressme.

6. Do not use torch to remove any component. System

cont+fins oil and refrigerant under pressure. To lemove

a component, wear pl+>tective goggles and pl+>ceed as

follows:

a. Shut off electrical power to unit and install

lockout tag.

b. Relieve all pressure from system using both

high-and low-pressure pol-ts. Use accepted

methods to recover refi'igerant.

c. Cut component connection tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs

when necessa U. Oil can ignite when exposed to

torch flame.

Proceed as follows to inspect and prepare the unit for initi+d

stm-t-up:

1. Remove +dl access panels.

2. Read and follow instructions on all WARNING CAU-

TION, and INFORMATION labels attached to or

shipped with unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages such as

broken lines, loose pm-ts, or disconnected wires.

b. [nspect for oil at all refiigerant tubing connections

and on unit base. Detecting oil generally indicates

a refrigerant leak. Leak-test all refrigerant tubing

connections using electronic leak detector, halide

torch, or liquid-soap solution.

c. [nspect all field-wiring and factou-wiring connec-

tions. Be sure that connections are completed and

tight.

d. [nspect coil fins. [f damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following:

a. Make sure that condenser-fan blades are correctly

positioned in fan orifice. Refer to Condenser-Fan

Adjustment section on page 39 for more details.

b. Make sure that air filters are in place.

c. Make sure that condensate drain trap is filled with

water to ensure proper drainage.

d. Make sure that all tools and miscellaneous loose

pm-ts have been removed.

e. Make sure that the start-up checklist has been per-

formed and filled out.

NOTE: Ensure wiring does not contact any refrigerant tubing.

Unit Preparation- Make sure that unit has been in-

stalled in accordance with these inst+fllation instructions and

applicable codes.

Return-Air Filters- Make sure conect filters are in-

stalled in unit (see Table 1). Do not operate unit without retum-

_firfilters.

Outdoor-Air Inlet Screens -- Outdoor-air inlet screens

must be in place before operating unit.

Compressor Mounting -- Compressors _ue internally

spring mounted. Do not loosen or remove compressor hold-

down bolts.

Internal Wiring- Check all electrical connections in

unit control boxes; tighten as required.

Refrigerant Service Ports-- Each independent re-

fiigerant system has a total of 4 Schrader-type service gage

polts per circuit. One port is located on the suction line, one on

the compressor discharge line, and 2 on the liquid line on both

sides of the filter diiel_ Be sure that caps on the ports ;,e tight.

Crankcase Heater(s)- Crankcase heatel_ are ener-

gized as long as there is power to the unit, the compressor is not

operating, and ambient temperature is below 75 E

High Flow Refrigerant Valves-- Three high flow

refrigerant valves are located on the compressor hot gas tube,

suction tube, and the liquid line leaving the condenser. L;uge

black plastic caps distinguish these valves with o-rings located

inside the caps. These valves can not be accessed for service in

the field. Ensure the plastic caps are in place and tight or the

possibility of refrigerant leakage could occm_

Compressor Rotation -- On 3-phase units, it is impor-

tant to be cel-tain the scroll compressor is rotating in the proper

direction. To determine whether or not compressor is rotating

in the proper direction:

1. Connect service gages to suction and disch;uge plessure

fittings.

2. Energize the compressol_

3. The suction pressure should di_)p and the disch;uge pres-

sure should rise, as is noml;d on any st;u-t-up.

If the suction pressure does not diop and the discharge pres-

sure does not rise to normal levels:

1. Note that the evaporator fan is probably also rotating in

the wrong dilection.

2. Tnm off power to the unit and install lockout tag.

3. Reverse any two of the unit power leads.

4. Turn on power to the unit.

The suction and discharge pressure levels should now move

to their noml;d start-up levels.

NOTE: When the compressor is rotating in the wrong dilec-

tion, the unit m;_es an elevated level of noise and does not

provide heating or cooling.

Compressor damage will occur if l_)tation is not immedi-

ately corrected.

Evaporator Fan -- Fan belt and variable pitch pulleys

;ue factory-inst;dled. See Tables 5-14 for fan performance data.

Be sure that fans rotate in the proper direction. See Table 15 for

air quantity limits. See Table 16 for evaporator fan motor

specifications. See Table 17 for fan rpm at various motor

pulley settings. To ;dter fan performance, see Evaporator Fan

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 48 49

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Carrier 50PG03-07 Especificações Página 29

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