| Performance Data Table 21-1 — Electric Heat Air Temperature Rise
| KW |
Total |
Cfm |
| Input |
MBH |
8000 |
9000 |
10000 |
11000 |
12000 |
13000 |
14000 |
15000 |
16000 |
17000 |
18000 |
19000 |
20000 |
| 36 |
123 |
14.2 |
12.6 |
11.3 |
10.3 |
9.4 |
8.7 |
8.1 |
7.6 |
— |
— |
— |
— |
— |
| 54 |
184 |
21.2 |
18.9 |
17.0 |
15.4 |
14.2 |
13.1 |
12.1 |
11.3 |
10.6 |
10.0 |
9.4 |
8.9 |
8.5 |
| 72 |
246 |
28.3 |
25.2 |
22.6 |
20.6 |
18.9 |
17.4 |
16.2 |
15.1 |
14.2 |
13.3 |
12.6 |
11.9 |
11.3 |
| 90 |
307 |
35.4 |
31.5 |
28.3 |
25.7 |
23.6 |
21.8 |
20.2 |
18.9 |
17.7 |
16.7 |
15.7 |
14.9 |
14.2 |
| 108 |
369 |
— |
— |
— |
— |
28.3 |
26.1 |
24.3 |
22.6 |
21.2 |
20.0 |
18.9 |
17.9 |
17.0 |
Notes:
1. Air temperature rise = (KW x 3413)/(scfm x 1.085).
2. All heaters on constant volume units provide 2
increments of capacity. All VAV units provide 1 step of heating capacity.
3. Air temperature rise in this table are based on heater
operating at 240, 480 or 600 volts.
Table 21-2 — Available Electric Heat KW Ranges
| Nominal Unit Size Tons |
Nominal Voltage |
| |
208 |
240 |
480 |
600 |
| 27.5 |
27-41 |
36-54 |
36-90 |
54-90 |
| 30.0 |
27-41 |
36-54 |
36-90 |
54-90 |
| 35.0 |
27-41 |
36-54 |
36-90 |
54-90 |
| 40.0 |
41 |
54 |
54-108 |
54-108 |
| 50.0 |
41 |
54 |
54-108 |
54-108 |
Notes:
1. KW ranges in this table are based on heater operating at
208, 240, 480, and 600 volts.
2. For other than rated voltage, KW = (Applied
Voltage/Rated Voltage)2 x Rated KW.
3. Electric heaters up to 54 KW are single element heaters,
those above 54 KW are dual element heaters.
Table 21-3 — Natural Gas Heating Capacities
| |
|
Heat Input MBH |
Heating Output MBH |
|
Tons |
Unit Model No. |
(See Note 1) |
(See Note 1) |
Air Temp. Rise, F |
| 27.5-35 |
YCD/YCH330**L |
|
|
|
| YCD/YCH360**L |
350,000/250,000 |
283,500/202,500 |
10-40 |
| YCD/YCH420**L |
|
|
|
| 27.5-35 |
YCD/YCH330**H |
|
|
|
| YCD/YCH360**H |
600,000/425,000 |
486,000/344,500 |
25-55 |
| YCD/YCH420**H |
|
|
|
| 40-50 |
YCD/YCH480**L |
|
|
|
| YCD/YCH600**L |
400,000/300,000 |
324,000/243,000 |
5-35 |
| 40-50 |
YCD/YCH480**H |
|
|
|
| YCD/YCH600**H |
800,000/600,000 |
648,000/486,000 |
20-50 |
Note:
1. Second stage is total heating capacity. Second
Stage/First Stage. |
