Thermal Dynamics SIGNATURE PAK 1250XRTM, Руководство пользователя

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31 SERVICE
4.4 TROUBLESHOOTING GUIDE
If the power supply malfunctions, the following table will be helpful in correcting the problem.
Since the problem may be due to a faulty connection rather than a faulty component, be sure to
check all connections to a component that appears to be malfunctioning.
The troubleshooting guide is arranged in the normal operating sequence of the system for easy
reference (refer to the Sequence of Operation on page 26). Each problem has listed next to it the
possible causes and the remedy.
When the external disconnect switch is closed and the ON/OFF switch is moved to ON, the red
AC indicator is lit, the fan motor turns on, the TEMP indicator is lit, and the GAS indicator
should be lit (if RUN/SET switch is in SET position with gases flowing). If this does not hap-
pen, check as follows:
TROUBLE POSSIBLE CAUSE REMEDY
A. AC indicator not lit.
B. Fan motor does not turn
on.
C. TEMP indicator is not lit.
1. Blown fuse, or open
circuit breaker at discon-
nect panel
2. Blown fuse (1FU)
3. Rear panel wiring harness
plug not properly con-
nected
4. ON/OFF switch (SW1)
faulty
5. Auxiliary transformer (T4)
faulty
6. Ribbon cable unplugged
7. Faulty status light PC
board
8. Faulty logic PC board
1. Motor not properly con-
nected to rear panel
wiring harness plug.
2. Fan motor faulty (M)
3. Auxiliary transformer (T4)
faulty
1. Rear panel wiring harness
plug not properly con-
nected
2. Unit overheated
3. Faulty thermal overload
switch (TP1, TP2, or TP3)
4. Faulty status light PC
board
1. Replace fuse or breaker at
disconnect, reset breaker.
2. Replace fuse.
3. Check connection.
4. Check switch and replace
if necessary.
5. Check T4 and replace if
necessary.
6. Check connection.
7. Check PC board and
replace if necessary.
8. Check PC board and
replace if necessary.
1. Check wire harness
connection.
2. Check motor and replace
if necessary.
3. Check T4 and replace if
necessary.
1. Check wire harness
connection.
2. Allow unit to cool.
3. Check switches and
replace if necessary.
4. Check PC board and
replace if necessary.