Specifications

33 Rev. 3
SYSTEM OPERATION
ELECTRIC HEATERS
Optional electric heaters may be added, in the quantities
shown in the specifications section to provide electric resis-
tance 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 installa-
tion.
Other components such as a Heating/Cooling Thermostat
and Outdoor Thermostats are available to complete the in-
stallation.
The system CFM can be determined by measuring the static
pressure external to the unit. The installation manual sup-
plied 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 operat-
ing 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.
EXAMPLE: Five (5) heaters provide 24.0 KW at the rated
240V. Our actual measured voltage is 220V, and our mea-
sured 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 installa-
tions. The temperature rise at a particular KW and CFM will
be greater at high altitudes, while the external static pres-
sure at a particular CFM will be less.
FORMULAS:
Heating Output = KW x 3413 x Corr. Factor
Actual CFM = CFM (from table) x Corr. Factor
BTUH = KW x 3413
BTUH = CFM x 1.08 x Temperature Rise (DT)
CFM = KW x 3413
1.08 x DT
DT = BTUH
CFM x 1.08
CFM
4.8
KW
7.2
KW
9.6
KW
14.4
KW
19.2
KW
24.0
KW
28.8
KW
600 25 38 51 NR NR NR NR
700 22 33 43 NR NR NR NR
800 19 29 38 57 NR NR NR
900 17 26 34 51 NR NR NR
1000 15 23 30 46 NR NR NR
1100 14 21 27 41 55 NR NR
1200 13 19 25 38 50 NR NR
1300 12 18 23 35 46 NR NR
1400 11 16 22 52 43 54 65
1500 10 15 20 30 40 50 60
1600 9 14 19 28 38 47 57
1700 9 14 18 27 36 44 53
1800 8 13 17 25 34 42 50
1900 8 12 16 24 32 40 48
2000 8 12 15 23 30 38 45
2100 7 11 14 22 29 36 43
2200 7 11 14 21 27 34 41
2300 7 10 13 20 26 33 39
TEMPERATURE RISE (F
o
) @ 240VAC
SUPPLY VOLTAGE 250 230 220 208
MULTIPLICATION FACTOR 1.08 0.92 0.84 0.75
BTUH CAPACITY CORRECTION FACTOR
HTR 4.8 7.3 9.6 14.4 19.2 24 28.8
KW KW KW KW KW KW KW KW
BTUH 16380 24915 32765 49150 65530 81915 98295
ELECTRIC HEATER CAPACITY BTUH