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VZ-VZH-VZT-IOM (08-24) 1047121-A
NOTE: To ensure long life and satisfactory performance, a heater that is operated under normal
conditions should be inspected and cleaned at the start of each heating season. If the heater is
operating in an area where an unusual amount of dust or soot or other impurities are present in
the air, more frequent maintenance is recommended.
The unit is designed to operate with a minimum of maintenance. However, to ensure long life and satisfactory
performance, routine service is recommended. When servicing, follow standard safety procedures and those specific
instructions and warnings in this manual.
Service Checklist
The following section is designed to aid a qualified service person in maintaining and servicing this equipment. At a
minimum, perform the following annually:
Check for any flammable objects, liquids, or vapors in heater’s vicinity and Immediately remove them if present.
Check to ensure that all clearances to combustibles are observed (refer to Clearances section).
Inspect reflectors for sagging, damage, and incorrect installation and clean as necessary using damp cloth.
Inspect vent pipe using flashlight to ensure that it is free from obstructions, cracks, gaps in sealed areas, and
corrosion—clean as necessary and remove any carbon deposits or scale using wire brush.
Inspect combustion air inlet using flashlight to ensure that it is free from obstructions, cracks, gaps in sealed
areas, and corrosion—clean as necessary.
Inspect tubes for cracks, sagging, bending, and incorrect installation—clean or replace as necessary.
Leak test gas line (refer to Supply Piping Connections section).
Inspect burner viewport to ensure that it is clean and free of cracks or holes—clean or replace as necessary.
Using compressed air or vacuum cleaner, clean all dirt, lint, and grease from blower and motor assembly.
Inspect burner assembly to ensure that it is free of scale, dust, and lint accumulation and clean as necessary—
remove any obstructions from burner orifice.
Inspect electrode for cracked or eroded ceramic and excessive carbon residue—clean or replace as necessary.
Ensure that spark gap is 1/8 inch (3.2 mm).
Check gas valve to ensure that gas flow is being shut off completely in accordance with Combination Gas Valve
Maintenance section.
Check thermostat to ensure that there is no exposed wire or damage—replace as necessary.
Check for any damaged wiring and replace as necessary—ensure that all wiring connections are sound.
Check for any damaged suspension hardware and replace as necessary.
Ensure that all safety labels are readable—replace as necessary.
Maintenance Procedures
Refer to Figure 35, Figure 36, or Figure 37 for component locations.
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