R410A REFRIGERANT

OUTDOOR FAN M UST BE OPERATING ON HIGH SPEED

150 200 250 300 350 400 450 500 550 600

Compressor Discharge Pressure, [psig]

Fig. 30 -- Charging Chart -- 50PG07

PURON® REFRIGERANT -- Puron refrigerant operates at

50 to 70 percent higher pressures than R-22. Be sure that

servicing equipment and replacement components are designed

to operate with Puron refrigerant. Do not mix with components

that have been used with other refrigerants. Puron refrigerant,

as with other HFCs, is only compatible with POE oils.

Recovery cylinder service pressure rating must be 400 psig.

Puron systems should be charged with liquid refrigerant. Use a

commercial-type metering device in the manifold hose. Mani-

fold sets should be 750 psig high-side and 200 psig low-side

with 520 psig low-side ret_ud. Use hoses with 750 psig service

pressure rating. Leak detectors should be designed to detect

HFC refrigerant.

Filter Drier -- Replace whenever refrigerant system is ex-

posed to atmosphere. Only use factory specified liquid-line

filter driers with working pressures no less than 650 psig. Do

not install a suction-line filter drier in liquid line. A liquid-line

filter drier designed for use with Puron refligemnt is required

on every unit.

Protective Devices

COMPRESSOR PROTECTION

High-Pressure Switch -- If the high-pressure switch opens, the

compressor will shut down. On 3-phase units, the compressor

lockout (CLO) device will energize to block lhrther compres-

sor operation. The high-pressure switch will reset automatical-

ly as the refrigerant pressure drops below its reset level. On

3-phase units, the CLO will remain energized until manually

reset.

Low-Pressure Switch -- If the low-pressure switch opens,

the compressor will shut down. On 3-phase units, the compres-

sor lockout (CLO) device will energize to block further com-

pressor operation. The low-pressure switch will reset automati-

cally as the refrigerant pressure rises above its reset level. On

3-phase units, the CLO will remtdn energized until manually

reset.

Freeze Protection Switch -- This switch is installed on each

evaporator coil section to provide protection against continued

unit operation with a frosted evaporator surface. If the freeze

protection switch opens, the compressor on this circuit will

shut down. On 3-phase units, tthe compressor lockout (CLO)

device will energize to block further compressor operation. The

freeze protection switch will reset as the evaporator tube tem-

perature rises above its reset level. On 3-phase units, the CLO

will remain energized until manually reset.

Compressor Ix)ckout (CLO) Device (3-Phase Units Only) --

The CLO prevents automatic recycling of the compressor as

safety controls reset. If the high-pressure switch, low-pressure

switch or freeze protection switch opens, the CLO device will

energize to block further compressor operation. To reset the

CLO (after all safety switches have reset), either open the ther-

mostat to remove the cooling demand signal (and then

re-close) or cycle the control power in the unit.

Overcurrent -- Each compressor has internal line break motor

protection.

Overtemperature -- Each compressor has an interned protector

to protect it agtdnst excessively high discharge gas temperatures.

EVAPORATOR FAN MOTOR PROTECTION -- Indoor fan

motors less than 5 hp are equipped with internal overcurrent

and overtemperature protection. Protection devices reset auto-

matically. Disconnect and lock out power when servicing

motol: Indoor-fan motors 5 hp and larger tue equipped with a

manual reset, calibrated trip, magnetic circuit breaker and over-

current protection. Do not bypass connections or increase the

size of the breaker to correct trouble. Determine the cause and

conect it before resetting the breakec

CONDENSER-FAN MOTOR PROTECTION -- Each

condenser-fan motor is intern_dly protected against

overtemperature.

Relief Devices -- All units have relief devices to protect

against &image from excessive pressures (i.e., fire). These

devices protect the high and low side and are located at the suc-

tion line service port. Protect joint during brazing operations

netu joint.

Control Circuit, 24-V- Each control circuit is pro-

tected against overcurrent by a 3.2 amp circuit breakel:

Breaker can be reset. [f it trips, determine cause of trouble

before resetting. See Fig. 31 and 32.

Replacement Parts -- A complete list of replacement

parts may be obt_dned from any Cartier distributor upon

request.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 48 49

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