State Industries SANDBLASTER SBD85 500 User Manual
Page 31
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SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
30
TROUBLESHOOTING THE EFFIKAL DAMPER (continued)
Condition:
Thermostat closed, damper is open fully
STEP 10A
TEST FOR 24VAC BETWEEN BLACK AND YELLOW
N
E
H
T
F
I
1
1
p
e
t
S
o
t
e
u
n
it
n
o
c
–
t
c
e
rr
o
c
s
i
s
i
h
T
t
n
e
s
e
r
p
s
i
C
A
V
4
2
24VAC is not present
• See Step 9B.
• Check the harness plug connecting.
• Check that cam on shaft rotates with
shaft.
• Replace the damper board.
• Ensure that cam is secure against end
switch.
Condition:
Damper rotates continuously
STEP 10B
ADJUST END SWITCH TO CAM CONTACT
N
E
H
T
F
I
Damper stops in proper position
24 VAC should be open on a call for heat
and close during standby/
Damper does not stop in proper position
• Replace damper assembly.
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