Carrier GTR040-420 Spezifikationen PDF herunterladen (Seite 70)

Relief Devices —

Fusible plugs are located in each cir-

cuit to protect against damage from excessive pressures.

HIGH-SIDE PROTECTION — One device is located

between condenser and filter drier; a second is on filter drier.

These are both designed to relieve pressure on a temperature

rise to approximately 210 F (99 C).

LOW-SIDE PROTECTION — A device is located on suc-

tion line and is designed to relieve pressure on a temperature

rise to approximately 170 F (77 C).

PRESSURE RELIEF VALVES (208/230, 460, 575 v;

60 Hz Units Only) — Valves are installed in each circuit (one

per circuit). The valves are designed to relieve at 450 psig

(3103 kPa). These valves should not be capped. If a valve

relieves, it should be replaced. If valve is not replaced, it may

relieve at a lower pressure, or leak due to trapped dirt from the

system which may prevent resealing.

The pressure relief valves are equipped with a

-in. SAE

flare for field connection. Some local building codes require

that relieved gases be removed. This connection will allow

conformance to this requirement.

Other Safeties —

There are several other safeties that are

provided by microprocessor control. For details refer to

Alarms and Alerts section on page 53.

MAINTENANCE

Recommended Maintenance Schedule —

The fol-

lowing are only recommended guidelines. Jobsite conditions

may dictate that maintenance schedule is performed more often

than recommended.

Routine:

For machines with E-coat Condenser Coils:

• Check condenser coils for debris, clean as necessary

with Carrier approved coil cleaner.

• Periodic clean water rinse, especially in coastal and

industrial applications.

Every month:

• Check condenser coils for debris, clean as necessary

with Carrier approved coil cleaner.

• Check moisture indicating sight glass for possible refrig-

erant loss and presence of moisture.

Every 3 months (for all machines):

• Check refrigerant charge.

• Check all refrigerant joints and valves for refrigerant

leaks, repair as necessary.

• Check chilled water flow switch operation.

• Check condenser coils for debris, clean as necessary

with Carrier approved coil cleaner.

• Check all condenser fans for proper operation.

• Check compressor oil level.

• Check crankcase heater operation.

Every 12 months (for all machines):

• Check all electrical connections, tighten as necessary.

• Inspect all contactors and relays, replace as necessary.

• Check accuracy of thermistors, replace if greater than

± 2 °F (1.2 °C) variance from calibrated thermometer.

• Obtain and test an oil sample. Change oil only if

necessary.

• Check to be sure that the proper concentration of anti-

freeze is present in the chilled water loop, if applicable.

• Verify that the chilled water loop is properly treated.

• Check refrigerant filter driers for excessive pressure

drop, replace as necessary.

• Check chilled water strainers, clean as necessary.

• Check cooler heater operation, if equipped.

• Check condition of condenser fan blades and that they

are securely fastened to the motor shaft.

• Perform Service Test to confirm operation of all

components.

• Check for excessive cooler approach (Leaving Chilled

Water Temperature — Saturated Suction Temperature)

which may indicate fouling. Clean cooler vessel if

necessary.

PRE-START-UP

Do not attempt to start the chiller until following checks

have been completed.

System Check

1. Check all auxiliary components, such as the chilled

fluid circulating pump, air-handling equipment, or other

equipment to which the chiller supplies liquid. Consult

manufacturer’s instructions. If the unit has field-

installed accessories, be sure all are properly installed

and wired correctly. Refer to unit wiring diagrams.

2. Backseat (open) compressor suction and discharge shut-

off valves. Close valves one turn to allow refrigerant pres-

sure to reach the test gages.

3. Open liquid line service valves.

4. Fill the chiller fluid circuit with clean water (with

recommended inhibitor added) or other noncorrosive

fluid to be cooled. Bleed all air out of high points of sys-

tem. An air vent is included with the cooler. If outdoor

temperatures are expected to be below 32 F (0° C), suffi-

cient inhibited ethylene glycol or other suitable corrosion-

inhibited antifreeze should be added to the chiller water

circuit to prevent possible freeze-up.

5. Check tightness of all electrical connections.

6. Oil should be visible in the compressor sight glass. See

Fig. 39. An acceptable oil level in the compressor is from

in. to

in. of sight glass. Adjust the oil level as re-

quired. No oil should be removed unless the crankcase

heater has been energized for at least 24 hours. See Oil

Charge section on page 58 for Carrier-approved oils.

7. Electrical power source must agree with unit nameplate.

8. Crankcase heaters must be firmly locked into compres-

sors, and must be on for 24 hours prior to start-up.

9. Fan motors are 3 phase. Check rotation of fans during the

service test. Fan rotation is clockwise as viewed from top

of unit. If fan is not turning clockwise, reverse 2 of the

power wires. For low noise fan option on 50 Hz chillers,

fans rotate counterclockwise as viewed from top of unit.

If fan is not turning counterclockwise, reverse 2 of the

power wires.

10. Check compressor suspension. Mounting rails must be

floating freely on the springs.

11. Perform service test to verify proper settings.

IMPORTANT: Before beginning Pre-Start-Up or Start-Up,

complete Start-Up Checklist for ComfortLink™ Chiller

Systems at end of this publication (page CL-1 to CL-8).

The Checklist assures proper start-up of a unit, and provides

a record of unit condition, application requirements, system

information, and operation at initial start-up.

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