29
PERFORMANCE DATA (CONT)
Multiplication Factors
Heater kW
Rating
Voltage Distribution
V/3/60
Multiplication Factor
240
200 .69
208 .75
230 .92
240 1.00
LEGEND
BF— Bypass Factor
edb— Entering Dry--Bulb
Ewb— Entering Wet--Bulb
kW — Total Unit Power Input
ldb— Leaving Dry--Bulb
lwb— Leaving Wet--Bulb
SHC— Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh) (net)
*At 75°F (23.8°C) entering dry bulb (Tennessee Valley Authority
[TVA] rating conditions); all other at 80°F (26.6°C) entering dry
bulb.
COOLING NOTES:
1. Ratings are net; they account for the effects of the evaporator
fan motor power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
Example: 15.0 kW (at 240v) heater on 208v
= 15.0 (.75 mult factor)
= 11.25 capacity at 208v
Sensible capacity
(Btuh)
1.10 x cfm
t
ldb =
t
edb
--
Wet--- bulb temperature corresponding to enthalpy
air leaving evaporator coil (
h
lwb)
t
lwb =
total capacity (Btuh)
4.5 x cfm
h
lwb =
h
e w b ---
Where:
h
ewb = Enthalpy of air entering evaporator coil
4. The SHC is based on 80_F (26.6_C) edb temperature of air
entering evaporator coil. Below 80_F (26.6_C) edb, subtract (corr
factor x cfm) from SHC.
Above 80_F (26.6_C) edb, add (corr factor x cfm) to SHC.
CorrectionFactor=1.10x(1+BF)x(edb+80).
5. Integrated capacity is maximum (instantaneous) capacity less the
effect of frost on the outdoor coil and the heat required to defrost it.
50XT
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