User Manual

Sealer Sales Page 31
ST-1808-28 Tunnel Service Manual
TROUBLESHOOTING—NO HEAT
NO HEAT
1. Check thermocouple wires at temperature controller
(Terminals +13 and -14). First, disconnect, then check with
meter for continuity across the two thermocouple wires.
(a) If no continuity is present across thermocouple wires,
replace thermocouple.
(b) Check terminals at 7 and 1 (wires 7 and 24) for 220-Volt
power on temperature controller when CR2 is pulled in
under set temperature.
(c) Check for 220 volt present with heater switch in on
position. If no power is present, check Fuse F4, .5 AMP.
If voltage present at wires 7 and 24 and Fuse F4 is good,
replace Temperature Control.
2. Please note: Before replacing the Temperature Control,
check the TS1 (TS1 NC closed; thermo overload for
blower motor) and TS2 (TS2 NC open; heat cool down
sensor) for continuity with the lead wires disconnected
from sensor.
Note: When any of the sensors are not functioning properly,
this causes the temperature controller to malfunction.
Terminals 13 & 14
Wire 24
Wire 7
-14
+13