Specifications

After Extended Shutdown — Ensure the liquid sys-

tem drains are closed. It may be advisable to flush the liquid

circuits to remove any soft rust which may have formed. This

is a good time to brush the tubes and inspect the Schrader

fittings on the optional liquid side flow devices for fouling, if

necessary.

Check the cooler pressure on the ICVC default screen and

compare it to the original holding charge that was left in the

chiller. If (after adjusting for ambient temperature changes) any

loss in pressure is indicated, check for refrigerant leaks. See

Check Chiller Tightness section, page 49.

Recharge the chiller by transferring refrigerant from the

pumpout storage tank (if supplied). Follow the Pumpout and

Refrigerant Transfer Procedures section, page 69. Observe

freeze-up precautions.

Carefully make all regular preliminary and running system

checks. Perform a Control Test before start-up. If the oil level

appears abnormally high, the oil may have absorbed refriger-

ant. A LOW OIL TEMPERATURE prestart alert will be

declared if the oil temperature is not greater than the CALC

EVAP SAT TEMP plus 15 F (8.3 C) or 140 F (60 C), whichev-

er is lower.

Cold Weather Operation — When the entering con-

denser liquid drops very low (55 F [13 C] minimum), the oper-

ator or tower control should automatically cycle the cooling

tower fans off to keep the temperature up. Piping may also be

arranged to bypass the cooling tower. The PIC III controls have

a Tower Fan Low control contact that can be used to assist in

this control (terminals 5 and 6 on the TB2 hazardous voltage

field wiring terminal strip).

Refrigeration Log — A refrigeration log, such as the

one shown in Fig. 40, provides a convenient checklist for

routine inspection and maintenance, and provides a continuous

record of chiller performance. It is an aid in scheduling routine

maintenance and in diagnosing chiller problems.

Keep a record of the chiller pressures, temperatures, and

liquid levels on a sheet similar to that shown. Automatic

recording of PIC III data is possible through the use of CCN

devices such as the Data Collection module and a Building

Supervisor. Contact your Carrier representative for more

information.