36
PKGP-PRC003-EN
Table PD-42 — Electric Heater Temperature Rise Correction Factors
% Variation From Nominal CFM
- 20
- 15
- 10
- 5
0
+5
+10
+15
+20
Temperature Rise Multiplier
1.25
1.17
1.11
1.05
1.00
0.95
0.91
0.87
0.83
Performance
Data
Table PD-41 — 6-10 Tons Air Temperature Rise Across Electric Heaters (Degrees F)
6 Ton
7½ Ton
10 Ton
2000
3000 CFM
4000 CFM
KW
Stages
WSC072A3, A4, AW
WSC090A3, A4, AW
WS120A3,A4,AW
9.00
1
14.2
9.5
—
18.00
1
28.5
19.0
14.2
27.00
2
42.7
28.5
21.3
36.00
2
56.9
1
37.9
28.5
54.00
2
—
—
42.7
For minimum design airflow, see airflow performance table for each unit.
To calculate temp rise at different air flow, use following formula:
Temp. Rise across Elect. Htr =
Note:
1. Minimum allowable aiflow for a 6 ton with a 36.0 KW heater is 2450 cfm.
kWx3414
1.08xCFM
Table PD-40 — Air Temperature Rise Across Electric Heaters (Degree F)
3 Ton
4 Ton
5 Ton
1200 CFM
1
1600 CFM
2
2000 CFM
3
Single Phase
Three Phase
Single Phase
Three Phase
Single Phase
Three Phase
KW
Stages
WSC036A11
WSC036A3,A4,AW
WSC048A1
WSC048A3,A4,AW
WSC060A1
WSC060A3,A4,AW
5.00
1
13.2
—
9.9
—
7.9
—
6.00
1
—
15.8
—
11.9
—
9.5
10.00
2
26.3
—
19.8
—
15.8
—
12.00
2
—
31.6
—
23.7
—
19.0
13.80
2
36.4
—
27.3
—
21.8
—
17.40
2
—
45.8
—
34.4
—
27.5
17.60
2
—
—
34.8
—
27.8
—
23.00
2
—
—
—
—
—
36.4
For minimum design airflow, see airflow performance table for each unit.
To calculate temp rise at different air flow, use following formula:
Temp. Rise across Elect. Htr =
Notes:
1. The minimum allowable airflow for a 3 ton with a 17.4 KW heater is 1020 CFM.
2. The minimum allowable airflow for a 4 ton with a 17.4 or 17.6 KW heater is 1440 CFM.
3. The minimum allowable airflow for a 5 ton with a 23.0 KW heater is 1900 CFM.
kWx3414
1.08xCFM
