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500
5 kw
0.00
0.00
10 kw
0.00
0.00
15 kw
0.00
0.00
20 kw
0.00
0.00
1100
1200
5 kw
0.00
0.00
10 kw
0.00
0.00
15 kw
0.00
0.02
20 kw
0.02
0.03
70
Based on Indoor Entering Air of 70 F and Rated CFM
60
50
40
30
20
10
0
-10
To initiate a forced defrost, two options are available depending on
the status of the defrost thermostat.
If defrost thermostat is closed, speedup pins (J1) must be shorted
by placing a flat head screw driver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle, as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screw driver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
TABLE 6—ELECTRIC HEAT PRESSURE DROP TABLE
SMALL CABINET: 024-036CFM
600
700
800
0.00
0.00
0.00
0.00
0.00
0.02
0.02
0.04
ELECTRIC HEAT PRESSURE DROP TABLE
LARGE CABINET: 042-060
1300
1400
1500
1600
0.00
0.01
0.02
0.01
0.02
0.03
0.03
0.04
0.05
0.04
0.05
0.06
Balance Point Worksheet
0
10
17
Fig. 24—602B Balance Point Worksheet
900
1000
1100
0.00
0.00
0.00
0.00
0.02
0.04
0.04
0.06
0.08
0.06
0.08
0.09
CFM
1700
1800
1900
0.03
0.04
0.05
0.06
0.04
0.05
0.06
0.07
0.06
0.07
0.08
0.09
0.07
0.08
0.09
0.10
20
30
Outdoor Air Temp (Deg F)
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with com-
pressor operation). On return to heating operation, compressor will
again turn off for an additional 30 sec and the outdoor fan for 40
sec. When the Quiet Shift is in OFF position, only a brief 30 sec
cycle will be observed.
If it is desirable to observe a complete defrost in warmer weather,
the defrost thermostat must be closed as follows.
1. Turn off power to outdoor unit.
2. Disconnect outdoor fan motor lead from OF2 on control
board. (See Fig. 19) Tape to prevent grounding.
—19—
1200
1300
1400
0.00
0.02
0.04
0.06
0.07
0.09
0.10
0.12
0.14
0.11
0.13
0.15
2000
2100
2200
0.07
0.08
0.09
0.08
0.09
0.10
0.10
0.11
0.12
0.11
0.12
0.13
40
47
50
1500
1600
0.06
0.07
0.10
0.11
0.16
0.18
0.17
0.19
2300
2400
2500
0.10
0.11
0.12
0.11
0.12
0.13
0.13
0.14
0.15
0.14
0.15
0.16
024
030
036
042
048
060
60
C00138
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