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8.4 CONDENSER FAN CONTROL
The chiller is equipped with 6, 8 or 10 condenser fans
(Fig. 40), with 3, 4 or 5 fans per system as given below.
Fan control is via Outside Ambient Temperature (OAT)
and Discharge Pressure (DP). There are six stages of
fan control utilizing 3 outputs per system. The fan stages
will work according to Table 3, Table 4 or Table 5, de-
pending on the number of fans/system. There will be a
minimum 5 second delay between all fan stages.
Condenser fan ON conditions are governed solely by
the Discharge Pressure (DP). When the DP rises above
220 PSIG, fan stage 1 is activated. From here, subse-
quent fan stages are activated as the DP rises in incre-
ments of 15 PSIG, except stage 6, which is activated
when the DP rises over 290 PSIG. The system will re-
main at the highest fan stage reached unless the OFF
conditions given in the next paragraph are satisfied.
FAN 1
FAN 2
FIG. 40 – CONDENSER FAN LAYOUT FOR DXRT 2-COMPRESSOR UNITS
148
FAN 3
FAN 5
FAN 4
FAN 6
YCAR 0315
0345
0365
0385
Condenser fan OFF conditions are governed by both
the DP and OAT. Fan staging will be decreased from
the highest stage reached if both the DP and OAT re-
quirements are met. For example, if a system is at a fan
stage of 4, and the DP falls under 195 PSIG and the
OAT drops below 75°F, the fan stage will be reduced to
3. The OFF conditions are given in the next three tables.
The tables on the next page also present fan contactor
data for the fans involved in each fan stage. SYS 1 uses
relay board #1. SYS 2 uses relay board #2.
YCAR 0315, 0345, 0365 and 0385 models have 3 con-
denser fans/system; YCAR 0415, 0435, 0475 and 0525
models have 4 condenser fans/system; and YCAR 0575,
0645 and 0685 models have 5 fans/system.
FAN 7
FAN 8
YCAR 0415
0435
0485
0525
FORM 150.52-NM2 (1001)
FAN 9
FAN 10
YCAR 0575
0645
0685
LD07267
YORK INTERNATIONAL
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