Henny Penny SCR-8 Service Manual page 51

Henny Penny
7-19. RELAYS (continued)
Replacement:
698
The following checks are performed with the wall
circuit breaker closed and the main power switch in the
ON position. Extreme caution should be taken. Make
connections before applying power, take reading, and
remove power before removing meter leads, or
electrical shock could result.
3. With power reapplied, let unit start heating up, or enter
the Tech Mode in Special Program mode and check the
relays in the output test. (See Section 4-8.)
4. With the component energized (example: blower
motor), 0 volts should show on the output side of the
relay, and 12 volts on the input side.
5. With the component not energized, 208 or 240 volts
should show on the output side of relay, and 0 volts on
input.
6. If voltage varies from steps 4 and 5, remove power to
unit, pull input wires from relay and place leads of
meter onto input wires. Reapply power to unit. When
unit is running, the input wires to relay should show
12 vdc volts. If this proves true, the relay is faulty.
7. Remove power supplied to unit.
8. With wires removed and labeled, use a Phillips head
screwdriver and remove appropriate relay from unit.
9. Coat the back of the relay with the thermal joint compound.
Failure to use the thermal joint compound will shorten
the life of the relay.
10. Install new relay and replace wires.
11. Replace side panel and reapply power.
SCR-6/8
7-15