SYSTEM OPERATION
29
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 blower section 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,
Outdoor Thermostat, and Compressor sound blankets are
available to complete the installation.
The system CFM can be determined by measuring the static
pressure external to the unit. The installation manual sup-
plied with the unit 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: 24.0 KW, 42°F Rise, 240 V = 1800 CFM from the
TEMPERATURE RISE chart below.
Heating output at 220 V = 24.0 x 3.413 x .84 - 68.8 MBh.
Actual CFM = 1800 x .84 = 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 (ΔT)
CFM = KW x 3413
1.08 x ΔT
ΔT = BTUH
CFM x 1.08
Heater Capacity @ 240 VAC
Heater Kit kW BTUH
Minimum
Circuit
Ampacit
Maximum
Overcurrent
Protection
L1 - L2 L3 - L4 L1 - L2 L3 - L4
PHCB05C1
4.8 16,400
25 -- 30 --
PHCB10C1
9.6 32,800
50 -- 60 --
PHCB15C1
14.4 49,100
50 25 60 30
PHCB20C1
19.2 65,500
50 50 60 60
ROTCAFNOITCERROCYTICAPACHUTB
EGATLOVYLPPUS084064044052032022802
ROTCAFNOITACILPITLUM90.100.119.80.129.48.57.
V042@)°F(ESIRERUTAREPMET
MFC
8.4
.W.K
2.7
.W.K
6.9
.W.K
4.41
.W.K
2.91
.W.K
0.42
.W.K
8.82
.W.K
006528315----
007223334 ----
00891928375---
00971624315---
0
00151320364 ---
00114112721455--
00213191528305--
00312181325364--
004111612223344556
005101510203040506
00619419182837475
00719418172634435
00818317152432405
00918216142230484
000282151320
38354
00127114122926334
00227114112724314
00327013102623393
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