Carrier Ecologic Series 3 Controls, Start-Up, Operation, Service, And Troubleshooting page 13

Table 9 — Air Temperature Switch Control
(09DK044 Units)
FAN FAN SWITCH
Above 65 ± 3 F (18.3 ± 1.7 C)
ON
Between 55 and 65 F (12.8 and 18.3 C)
and temperature falling
FAN 2
Below 55 ± 3 F (12.8 ± 1.7 C)
OFF
Between 55 and 65 F (12.8 and 18.3 C)
and temperature rising
Above 80 ± 3 F (26.7 ± 1.7 C)
ON
Between 70 and 80 F (21.1 and 26.7 C)
and temperature falling
FAN 3
Below 70 ± 3 F (21.1 ± 1.7 C)
OFF
Between 70 and 80 F (21.1 and 26.7 C)
and temperature rising
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.
30GX080-105
2
CONTROL
BOX
END
3
1
30GX151,161,175,205,225
10 8 6
9 7 5
30GX206,226,250
1 3
CONTROL
BOX
END
2
4
TEMPERATURE
30GX106-125
2
4
4
1
3
4 2
CONTROL
BOX
END
3 1
9 11
5 7
6 8 10 12
30GX281-350
16 12 10
14
13
15 11 9
Fig. 5 — 30GX Condenser Fan Locations
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
ambient, fans 5 and 6 are off; above 80
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.
6
2
CONTROL
BOX
END
5
1
30GX176
12 10 8
11 9 7
14 12 10
13 11 9
8 4
6
2
CONTROL
BOX
END
5
7 3 1
13
± ±
3 F (21.1 1.7 C) outdoor
± ±
3 F (26.7
30GX136,150,160
4 6
3 5
6 4
2
CONTROL
BOX
END
3
1
5
30GX251,265
4
8
6 2
7 5 3 1
1.7 C) fans
8
CONTROL
BOX
END
7
CONTROL
BOX
END