LAARS U.H.E. - Service Manual - Manual (Page 4)

LAARS Heating Systems Page 4
Tools Required for Service
It is intended for this manual to be used by qualified service personal for the primary purpose
of troubleshooting analysis and repair of the LAARS heating system Ultra High Efficiency
Water Heater. Understanding the sequence of operation section of this manual will contribute
greatly to troubleshooting this product.
An “Installation Check List” is shown on page 43. Compare the installation against the
installation check list to confirm all requirements are met.
An “UHE Service Report” is shown on page 44. Completing this form will assist in the
troubleshooting efforts. Should you need to call for technical support, Please provide the
information shown on this form to the support technician to insure accurate troubleshooting.
Troubleshooting begins with “System Observation” to determine failure mode as indicated by
the LED status of the ignition module. Troubleshooting continues with “Failure Modes and
Probable cause” listed on page 10 directing the service provider to a series of test
procedures to determine root cause of failure. Component replacement procedures directly
follow the test procedures for a given component.
In some difficult to diagnose conditions, it may be necessary to isolate the heater from the
vent system to determine root cause.
Contact Technical support immediately if diagnosis is not determined using the methods
described in this service manual.
Manometer: Two types available, a liquid “U” tube type or a digital (magna-helic)
type. This device is used to measure gas and/or air pressures and
vacuum.
Multi-Meter: A digital type is strongly recommended. This device is used to measure
electrical values. The meter you select must have the capability to
measure volts AC, volts DC, Amps, micro-amps and ohms.
Thermometer: Used to measure water temperature. An accurate thermometer is
recommended.
Water Pressure Gage: Used to measure water supply pressure. Also used to determine tank
pressure by adapting to the drain valve of the heater.
Jumper Leads: A length of wire (12" min.) with alligator clip at both ends.
Various Hand Tools: Pipe wrench, channel locks, open end wrench set, 12" crescent wrench,
Allen wrench set, torx bit set, screw drivers (common & phillips), long
reach (12") magnetic tip phillips head screw driver #2 tip, ¼" nut driver,
pliers (common & needle nose), socket set including a 1-1/16 deep well
socket, wire cutters, wire strippers, wire crimpers, torpedo level, small
shop vac, step ladder, and flashlight.
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