11
9.1 Return Ductwork
DO NOT LOCATE THE RETURN DUCTWORK IN
AN AREA THAT CAN INTRODUCE TOXIC, OR
OBJECTIONABLE FUMES/ODORS INTO THE
DUCTWORK. The return ductwork is to be connected
10 Return Air Filters
or 24x20x1” (actual dimension must be less than 23-½”x20”)
(the cabinet size is the seventh letter of the model number).
11 Electric Heat
Refer to the installation manual provided with the electric
heat kit for the correct installation procedure. All electric heat
kits that are permitted to be used are the HKS series. Refer
to the air handler unit’s Serial and Rating plate or the HKS
with a given air handler. No other accessory heat kit besides
the HKS series may be installed in these air handlers.
The heating mode temperature rise is dependent upon the
(kW) selected. Use data provided in Tables 5, 6, AND 7 to
determine the temperature rise (°F).
NOTE: For installations not indicated above the following
formula is to be used:
TR = (kW x 3412) x (Voltage Correction) / (1.08XCFM)
Where: TR = Temperature Rise
kW = Heater Kit Actual kW
3412 = Btu per kW
VC* = .96 (230 Supply Volts)
= .92 (220 Supply Volts)
= .87 (208 Supply Volts)
1.08 = Constant
*VC (Voltage Correction)
NOTE: The Temperature Rise Tables can also be used to
tables for this purpose set the room thermostat to maximum
heat and allow the system to reach steady state conditions.
Insert two thermometers, one in the return air and one in the
supply air. The temperature rise is the supply air temperature
minus the room air temperature. Using the temperature rise
calculated, CFM can be estimated from the TR formula
above. See Service Manual for more information.
3568 10 15 19/20 25
800 12 19 23 31 37
1000 9 15 19 25 30 44
1200 8 12 15 21 25 37 49 62
1400 7 11 13 18 21 32 42 53
1600 6 9 12 15 19 28 37 46
1800 5 8 10 14 16 25 33 41
2000 579 12 15 22 30 37
CFM
HEAT KIT NOMINAL kW
230/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 5
3568 10 15 19/20 25
800 11 18 22 30 35
1000 9 14 18 24 28 42
1200 7 12 15 20 24 35 47 59
1400 6 10 13 17 20 30 40 51
1600 6 9 11 15 18 27 35 44
1800 5 8 10 13 16 24 31 39
2000 479 12 14 21 28 35
CFM
HEAT KIT NOMINAL kW
220/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 6
3568 10 15 19/20 25
800 10 17 21 28 33
1000 8 13 17 22 27 40
1200 7 11 14 19 22 33 45 56
1400 6 10 12 16 19 29 38 48
1600 5 8 10 14 17 25 33 42
1800 579 12 1 5 22 30 37
2000 478 11 1 3 20 27 33
CFM
HEAT KIT NOMINAL kW
208/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 7
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