SERVICING
90
1. Remove the wiring from the control terminals.
2. Using an ohmmeter test for continuity across the normally
closed contacts. No reading indicates the control is open
- replace if necessary. Make sure the limits are cool before
testing.
If Found Open - Replace - Do Not Wire Around.
Checking Heater Elements
Optional electric heaters may be added, in the quantities
shown in the spec sheet for each model unit, to provide
electric resistance heating. Under no condition shall more
heaters than the quantity shown be installed.
WARNING
High Voltage!
Disconnect all power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disassemble and remove the heating element(s).
2. Visually inspect the heater assembly for any breaks in the
wire or broken insulators.
3. Using an ohmmeter, test the element for continuity - no
reading indicates the element is open. Replace as
necessary.
Electric Heater (Optional Item)
Optional electric heaters may be added, in the quantities
shown in the specifications section, to provide electric
resistance heating. Under no condition shall more heaters
than the quantity shown be installed.
The low voltage circuit in the air handler is factory wired
and terminates at the location provided for the electric
heater(s). A minimum of field wiring is required to complete
the installation.
Other components such as a Heating/Cooling Thermostat
and Outdoor Thermostats are available to complete the
installation.
The system CFM can be determined by measuring the
static pressure external to the unit. The installation manual
supplied with the blower coil, or the blower performance
table in the service manual, shows the CFM for the static
measured.
Alternately, the system CFM can be determined by
operating the electric heaters and indoor blower WITHOUT
having the compressor in operation. Measure the
temperature rise as close to the blower inlet and outlet as
possible.
If other than a 240V power supply is used, refer to the
BTUH CAPACITY CORRECTION FACTOR
chart below.
BTUH CAPACITY CORRECTION FACTOR
SUPPLY VOLTAGE
250
230
220
208
MULTIPLICATION FACTOR 1.08
.92
.84
.75
EXAMPLE:
Five (5) heaters provide 24.0 KW at the rated
240V. Our actual measured voltage is 220V, and our
measured temperature rise is 42°F. Find the actual CFM:
Answer:
24.0KW, 42°F Rise, 240 V = 1800 CFM from the
TEMPERATURE RISE
chart on the right.
Heating output at 220 V = 24.0KW x 3.413 x .84 = 68.8
MBH.
Actual CFM = 1800 x .84 Corr. Factor = 1400 CFM.
NOTE: The temperature rise table is for sea level
installations. The temperature rise at a particular KW
and CFM will be greater at high altitudes, while the
external static pressure at a particular CFM will be less.
CFM 3.0
kW
4.8
kW
7.2
kW
9.6
kW
14.4
kW
19.2
kW
24.0
kW
28.8
kW
600
16
25
38
51
-
-
-
-
700
14
22
33
43
-
-
-
-
800
12
19
29
38
57
-
-
-
900
11
17
26
34
51
-
-
-
1000
10
15
23
30
46
-
-
-
1100
9
14
21
27
41
55
-
-
1200
8
13
19
25
38
50
-
-
1300
7
12
18
23
35
46
-
-
1400
7
11
16
22
32
43
54
65
1500
6
10
15
20
30
40
50
60
1600
6
9
14
19
28
38
47
57
1700
6
9
14
18
27
36
44
53
1800
5
8
13
17
25
34
42
50
1900
5
8
12
16
24
32
40
48
2000
5
8
12
15
23
30
38
45
2100
5
7
11
14
22
29
36
43
2200
4
7
11
14
21
27
34
41
2300
4
7
10
13
20
26
33
39
TEMPERATURE RISE (°F) @ 240V
HTR
KW
3.0
KW
4.7
KW
6.0
KW
7.0
KW
9.5
KW
14.2
KW
19.5
KW
21.0
KW
BTUH 10200 16200 20400 23800 32400 48600 66500 71600
ELECTRIC HEATER CAPACITY BTUH
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