64 YORK INTERNATIONAL
STAGE ON OFF
Lag Compr. Loader Stage 4* Setpoint plus 1.8°F (.99°C) Setpoint plus 1.3°F (.72°C)
Lag Compr. Loader Stage 3 Setpoint plus 1.5°F (.83°C) Setpoint plus 1.0°F (.55°C)
Lag Compr. Loader Stage 2 Setpoint plus 1.2°F (.66°C) Setpoint plus 0.5°F (.27°C)
Lag Compressor (Stage 1) Setpoint plus 0.8°F (.44°C) Setpoint plus 0.2°F (.11°C)
Lead Compr. Loader Stage 4* Setpoint plus 0.2°F (.11°C) Setpoint minus 0.3°F (.16°C)
Lead Compr. Loader Stage 3 Setpoint minus 0.2°F (.11°C) Setpoint minus 0.8°F (.44°C)
Lead Compr. Loader Stage 2 Setpoint minus 0.5°F (.27°C) Setpoint minus 1.3°F (.72°C)
Lead Compressor (Stage 1) Setpoint minus 1.0°F (.55°C) Setpoint minus 1.8°F (.99°C)
COOLING RANGE
SWITCH = 5
COOLING RANGE
OF ± 1.8°F (.99°C)
DUAL CIRCUIT UNITS
STAGE ON OFF
Lag Compr. Loader Stage 4* Setpoint plus 1.9°F (.55°C) Setpoint plus 1.4°F (.77°C)
Lag Compr. Loader Stage 3 Setpoint plus 1.5°F (.83°C) Setpoint plus 0.9°F (.49°C)
Lag Compr. Loader Stage 2 Setpoint plus 1.1°F (.61°C) Setpoint plus 0.4°F (.22°C)
Lag Compressor (Stage 1) Setpoint plus 0.7°F (.38°C) Setpoint minus 0.1°F (.05°C)
Lead Compr. Loader Stage 4* Setpoint plus 0.2°F (.11°C) Setpoint minus 0.7°F (.38°C)
Lead Compr. Loader Stage 3 Setpoint minus 0.2°F (.11°C) Setpoint minus 1.1°F (.61°C)
Lead Compr. Loader Stage 2 Setpoint minus 0.7°F (.38°C) Setpoint minus 1.5°F (.83°C)
Lead Compressor (Stage 1) Setpoint minus 1.2°F (.66°C) Setpoint minus 1.9°F (1.05°C)
COOLING RANGE
SWITCH = 6
COOLING RANGE
OF ± 1.9°F (1.05°C)
STAGE ON OFF
Lag Compr. Loader Stage 4* Setpoint plus 2.0°F (1.11°C) Setpoint plus 1.4°F (.77°C)
Lag Compr. Loader Stage 3 Setpoint plus 1.5°F (.83°C) Setpoint plus 0.9°F (.49°C)
Lag Compr. Loader Stage 2 Setpoint plus 1.1°F (.61°C) Setpoint plus 0.4°F (.22°C)
Lag Compressor (Stage 1) Setpoint plus 0.6°F (.33°C) Setpoint minus 0.1°F (.05°C)
Lead Compr. Loader Stage 4* Setpoint plus 0.2°F (.11°C) Setpoint minus 0.7°F (.38°C)
Lead Compr. Loader Stage 3 Setpoint minus 0.2°F (.11°C) Setpoint minus 1.1°F (.61°C)
Lead Compr. Loader Stage 2 Setpoint minus 0.7°F (.38°C) Setpoint minus 1.5°F (.83°C)
Lead Compressor (Stage 1) Setpoint minus 1.2°F (.66°C) Setpoint minus 2.0°F (1.11°C)
COOLING RANGE
SWITCH = 7
COOLING RANGE
OF ± 2.0°F (1.11°C)
LWT COOLING RANGES (4 STAGE)
The user may use LWT control with a 4 stage chiller.
This can be accomplished by placing SW5 OFF on the
Micro Logic Board which configures the Micro for 4 stage
control. The disadvantage of 4 stages is that we are cy-
cling large tonnages each time we turn a stage on or off.
This could cause continuous cycling with the possibility
*If optional 6 or 7 stage loading/unloading is included, Stage 4 loading and unloading is not included on one or both compressors. Therefore, in
the examples above, no system response will take place at the temperatures where Stage 4 is to be activated or deactivated on one or both
compressors.
of undesirable fluctuating leaving water temperatures.
The variation in LWT is primarily due to the compres-
sors cycling off and water temperature rising before the
anti-recycle timer times out to allow the compressor to
restart. The factory does not recommend that the equip-
ment be used in this manner.
STAGE ON OFF
Lag Compr. Loader Stage 2 Setpoint plus 1.0°F (.55°C) Setpoint plus 0.5°F (.27°C)
Lag Compressor (Stage 1) Setpoint plus 0.5°F (.27°C) Setpoint
Lead Compr. Loader Stage 2 Setpoint Setpoint minus 0.5°F (.27°C)
Lead Compressor (Stage 1) Setpoint minus 0.5°F (.27°C) Setpoint minus 1.0°F (.55°C)
COOLING RANGE
SWITCH = 0
COOLING RANGE
OF ± 1.0°F (± .55°C)
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