Checking Operation; Operating Log Sheet - York CodePak YK L1 L1 G4 Operation Manual

out the operating year. Exact control of condenser wa-
ter such as a cooling tower bypass, is not necessary
for most installations. The CodePak requires only that
the minimum condenser water temperature be no lower
than the value determined by referring to the formula
below:
Min. ECWT = LCHWT—C RANGE + 5 +
where:
ECWT = entering condensing water temperature
LCHWT = leaving chilled water temperature
C RANGE = condensing water temperature range
At start-up, the entering condenser water temperature
may be as much as 25°F (13.9°C) colder than the stand-
by return chilled water temperature. Cooling tower
fan cycling will normally provide adequate control of
the entering condenser water temperature on most in-
stallations.

CHECKING OPERATION

During operation, the following conditions should be
periodically checked:
1. On starting, the prerotation vanes should remain
closed until the compressor motor is up to speed
on the on the run winding; then the vane motor should
*NOTE: These items can be printed by an electronic printer connected to J11 of the Micro Board and pressing the PRINT key on the
Micro Board or automatically using the Data Logger feature.
FIG. 16 – LIQUID CHILLER LOG SHEETS – FORM 160.44-F6
YORK INTERNATIONAL
cause the vanes to modulate with load require-
ments.
2. Be sure the oil pump is operating while unit is run-
ning.
3. Check Oil Pressure display. A gradual decrease in
( 15 x % LOAD )
bearing oil pressure of 5 to 10 psi (34.5 to 69 kPa)
100
(with constant suction and discharge pressures)
may be an indication of a dirty filter. The filter should
be replaced when pressure loss is 30% or more of
the original pressure. The actual bearing oil pres-
sure will vary with compressor suction and dis-
charge pressures. When a new system is first op-
erated under normal full load conditions, the bear-
ing oil pressure should be recorded as a reference
point with which to compare subsequent readings.

OPERATING LOG SHEET

A permanent daily record of system operating condi-
tions (temperatures and pressures) recorded at regu-
lar intervals throughout each 24 hour operating period
should be kept.
An optional status printer is available for this purpose
or Fig. 16 shows a log sheet used by YORK Personnel
for recording test data on CodePak systems. It is avail-
LD01078
FORM 160.49-O1
23889A
31