Troubleshooting; Before Troubleshooting; Check Control Module Fuses; Control Module Fuses - Lochinvar ARMOR 151 - 801 Service Manual

Label all wires prior to disconnection
when servicing controls.
errors can cause improper and
dangerous
disconnect power to the water heater
before servicing. Failure to comply
could result in severe personal injury,
death,
damage.
Never jumper (bypass) any device
except for momentary testing as
outlined in the Troubleshooting
chart. Severe personal injury, death,
or substantial property damage can
result.
1. Have the following items:
a. Voltmeter that can check 120 VAC, 24 VAC, and
12 VDC.
b. Continuity checker.
c. Contact thermometer.
2. Check for 120 VAC (minimum 102 VAC to
maximum 132 VAC) to water heater.
3. Make sure thermostat is calling for heat and
contacts (including appropriate zone controls) are
closed. Check for 24 VAC between thermostat wire
nuts and ground.
4. Make sure all external limit controls are installed
and operating.
1. Wire connectors to control module are securely
plugged in at the module and originating control.
2. Gas pressures:
• Maximum: 14 inches w.c. (natural and LP) with
no flow (lockup) or with water heater on
• Minimum: 4 inches w.c. (natural), 8 inches w.c.
(LP) with gas flowing (verify during water heater
startup)
24
Wiring
operation. Always
or substantial property
ALWAYS check control module fuses before
replacing control module or any major
components (blower, etc.). If one of these fuses
is blown, it can prevent the control module or
other components from operating.
1. Turn OFF power to the water heater at the external line
switch.
2. Remove top access cover.
3. Remove the control module cover.
4. Inspect fuses F1, F2 and F3, see FIG 3-1 below.
Figure 3-1
F3 - .80 AMP FUSE
24V DC POWER SUPPLY
F1 - 5 AMP FUSE
PUMPS
F2 - 3.15 AMP FUSE
BLOWER
5. The water heater is shipped with three (3) spare fuses in a
plastic bag attached to the control module cover.
6. If necessary, replace open fuse (F3 is .80 amps, F2 is 3.15 amps,
and F1 is 5 amps).
Note: Fuses F1, F2 and F3 are all slow blow fuses.
Do not jumper fuse or replace with any fuse
except as specified. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
7. Install control module cover and top access cover after fuse
inspection.
8. Restore power to the water heater at the external line switch
and verify water heater operation (Section 10 - Start-up in the
Armor Water Heater Installation and Operation Manual) after
completing water heater service.
Service Manual