13
Table 9 — Air Temperature Switch Control
(09DK044 Units)
The fan cycling pressure switch controls the fans as follows:
Fans 3 and 4 are on above 185
±
10 psig (1276
±
69 kPa) and
off below 97
±
10 psig (669
±
69 kPa). If pressure is rising be-
tween 97 psig (669 kPa) and 185 psig (1276 kPa), fans 3 and 4
are off. If pressure is falling from 185 psig (1276 kPa) to
97 psig (669 kPa) fans 3 and 4 are on.
The 09DK054-094 condensers are supplied with fan cy-
cling pressure switches suitable for use with R-22 refrigerant.
Fan cycling pressure switches that are compatible with R-134a
refrigerant pressures are shipped with the 30HXA chillers.
These fan cycling pressure switches must be installed in place
of the 09DK factory-installed switches before charging to en-
sure proper head pressure control.
The air temperature switch controls the fans as follows: On
the 074-094 condensers, below 70
±
3 F (21.1
±
1.7 C) outdoor
ambient, fans 5 and 6 are off; above 80
±
3 F (26.7
±
1.7 C) fans
5 and 6 are on. Between 70 F (21.1 C) and 80 F (26.7 C),
whether fans 5 and 6 are on or off depends on whether temper-
ature is rising or falling. If the temperature is rising from 70 F
(21.1 C) to 80 F (26.7 C), fans 5 and 6 are off. If the tempera-
ture is falling from 80 F (26.7 C) to 70 F (21.1 C), fans 5 and 6
are on.
FAN
FAN SWITCH
TEMPERATURE
FAN 2
ON
Above 65
±
3 F (18.3
±
1.7 C)
Between 55 and 65 F (12.8 and 18.3 C)
and temperature falling
OFF
Below 55
±
3 F (12.8
±
1.7 C)
Between 55 and 65 F (12.8 and 18.3 C)
and temperature rising
FAN 3
ON
Above 80
±
3 F (26.7
±
1.7 C)
Between 70 and 80 F (21.1 and 26.7 C)
and temperature falling
OFF
Below 70
±
3 F (21.1
±
1.7 C)
Between 70 and 80 F (21.1 and 26.7 C)
and temperature rising
1
2
3
4
CONTROL
BOX
END
5
6
7
8
9
10
CONTROL
BOX
END
4
2
1
3
CONTROL
BOX
END
1
3
5
7
2
4
6
8
CONTROL
BOX
END
4
6
1
3
5
2
5
CONTROL
BOX
END
7
9
11
12
6
8
10
4
2
3
1
CONTROL
BOX
END
1
3
5
7
2
4
6
8
9
11
12
10
CONTROL
BOX
END
1
3
5
7
2
4
6
8
14
12
10
13
11
9
CONTROL
BOX
END
2
4
6
8
14
12
10
16
1
3
5
7
13
11
9
15
Fig. 5 — 30GX Condenser Fan Locations
30GX080-105 30GX106-125
30GX136,150,160
30GX151,161,175,205,225 30GX176
30GX206,226,250 30GX251,265
30GX281-350