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