Carrier 50JX Series Product Data page 17

Performance data (cont)
HEATER kW
RATING
240
480
Example: 20 kW (at 240v) heater on 230v
= 20.0 (.92 mult factor)
= 18.4 kW capacity at 230 v
LEGEND
BF—Bypass Factor
Ewb—Entering Wet-Bulb
kW—Total Unit Power Input
SHC—Sensible Heat Capacity (1000 Btuh)
TC—Total Capacity (1000 Btuh) (net)
Edb—Entering Dry-Bulb
rh—Relative Humidity
Indicates Integrated Ratings
70
Based on Indoor Entering Air of 70 F and Rated CFM
60
50
40
30
20
10
0
-10
ECONOMIZER 1-in. FILTER PRESSURE DROP (in. wg)
UNIT50JX
024-036
042-060
MULTIPLICATION FACTORS
NOTES:
1. Ratings are net; they account for the effects of the evaporator-fan motor power
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
t
t
h
Where: h
4. The SHC is based on 80 F edb temperature of air entering evaporator coil.
5. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
Balance Point Worksheet
0 10 17
Outdoor Air Temp (Deg F)
VOLTAGE
DISTRIBUTION
V/3/60
200
208
230
240
440
460
480
and heat.
sensible capacity (Btuh)
= t
ldb edb
1.10 x cfm
= Wet-bulb temperature corresponding to enthalpy of air leaving
lwb
evaporator coil (h )
lwb
total capacity (Btuh)
= h
lwb ewb
4.5 x cfm
= Enthalpy of air entering evaporator coil
ewb
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
on the outdoor coil and the heat required to defrost it.
20 30 40
PRESSURE DROP
0.20
0.25
MULTIPLICATION
FACTOR
.69
.75
.92
1.00
.84
.92
1.00
47 50 60
C00093
024
030
036
042
048
060
17