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VZ-VZH-VZT-IOM (08-24) 1047121-A
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Burner Assembly Maintenance
1. Turn OFF electric and gas.
2. Remove burner cabinet panel(s) for access:
a. For models VZ and VZT, disconnect combustion air piping from blower if unit is connected to outside combustion
air, unplug blower motor power cable, and remove top blower panel with blower and motor assembly attached.
b. For model VZH, remove side panel.
3. Inspect and clean burner—remove any carbon buildup, scale, dust, lint, and/or any foreign material using stiff
bristle brush.
4. Check ignition system for deterioration. Ensure that lead connectors are secure to prevent incorrect sparking
of electrode and that spark gap is 1/8 inch (3.2 mm). Check electrode for dirt or damaged—clean or replace as
necessary.
5. Re-install panel(s) removed in step 2. For models VZ and VZT, reconnect combustion air piping to blower if unit
is connected to outside combustion air and plug in blower motor power cable.
6. Turn ON electric and gas and check for proper operation.
Blower and Motor Assembly Maintenance
1. Turn OFF electric and gas.
2. For units connected to outside combustion air, disconnect combustion air piping from unit.
3. For models VZ and VZT, remove external blower and motor assembly:
a. Unplug blower motor power cable.
b. Remove and save four locknuts that secure blower and motor assembly and remove assembly.
4. For model VZH, remove integral blower and motor assembly:
a. Remove side panel and unplug blower motor wiring harness.
b. Remove and save four screws that secure blower and motor assembly and remove assembly.
5. Using soft brush, remove any dust from blower scroll, from around motor, and from impeller. Ensure that impeller
rotates freely.
6. Re-install blower and motor assembly using existing hardware.
7. Reconnect blower motor power cable/wiring harness. For model VZH, re-install side panel.
8. For units connected to outside combustion air, reconnect combustion air piping to unit.
9. Turn ON electric and gas and check for proper operation.
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