41
SERVICING
HTR
KW
3.0
KW
4.7
KW
6.0
KW
7.0
KW
9.5
KW
14.2
KW
19.5
KW
21.0
KW
BTUH 10200 16200 20400 23800 32400 48600 66500 71600
ELECTRIC HEATER CAPACITY BTUH
FORMULAS:
Heating Output = KW x 3.413 x Corr. Factor
Actual CFM = CFM (from table) x Corr. Factor
BTUH = KW x 3.413
BTUH = CFM x 1.08 x Temperature Rise (T)
CFM = KW x 3.413
1.08 x T
T = BTUH
CFM x 1.08
S-61A CHECKING HEATER LIMIT CONTROL(S)
Each individual heater element is protected with a limit control
device connected in series with each element to prevent overheat-
ing of components in case of low airflow. This limit control will
open its circuit at approximately 150
°
F.
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Remove the wiring from the control terminals.
2. Using an ohmmeter, test for continuity across the normally
closed contacts. No reading indicates the control is open -
replace if necessary.
IF FOUND OPEN - REPLACE - DO NOT WIRE AROUND.
S-61B CHECKING HEATER FUSE LINK (OPTIONAL
ELECTRIC HEATERS)
Each individual heater element is protected with a one time fuse
link which is connected in series with the element. The fuse link
will open at approximately 333
°
F.
WARNING
Disconnect ALL power before servicing.
1. Remove heater element assembly so as to expose fuse link.
2. Using an ohmmeter, test across the fuse link for continuity - no
reading indicates the link is open. Replace as necessary.
NOTE:
The link is designed to open at approximately 333
°
F. DO
NOT WIRE AROUND - determine reason for failure.
220/1/60 SUPPLY VOLTAGE - TEMP. RISE
°
F
3
5
6
8
10
15
19/20
25
800
11
18
22
30
35
1000
9
14
18
24
28
42
1200
7
12
15
20
24
35
47
59
1400
6
10
13
17
20
30
40
51
1600
6
9
11
15
18
27
35
44
1800
5
8
10
13
16
24
31
39
2000
4
7
9
12
14
21
28
35
CFM
HEAT KIT NOMINAL kW
208/1/60 SUPPLY VOLTAGE - TEMP. RISE
°
F
3
5
6
8
10
15
19/20
25
800
10
17
21
28
33
1000
8
13
17
22
27
40
1200
7
11
14
19
22
33
45
56
1400
6
10
12
16
19
29
38
48
1600
5
8
10
14
17
25
33
42
1800
5
7
9
12
15
22
30
37
2000
4
7
8
11
13
20
27
33
CFM
HEAT KIT NOMINAL kW
MINIMUM CFM REQUIRED FOR HEATER KITS
3
5
6
8
10
15
19
20
25
DV25PECB14
550
650
700
715
875
DV37PECC14
850
900 1000 1120 1220 1250
DV59PECD14
990 1110 1200 1240 1520
1520
DV61PECD14
1030 1150 1250 1320 1650
1690 1715
Model
HEATER (kW)
