Direct Gas Make-Up Air
47
Start-Up
Repeat
Supply Fan, Pre-Start Checks and Start-Up;
Pre-Start: Direct Gas-Fired Heating; and Start-Up:
Direct Gas-Fired Heating
sections in this Installation,
Operation and Maintenance Manual. This will ensure
that the gas and air are set properly before the heating
season begins and should lead to trouble free operation
all winter.
High Limit
The high limit switch may have tripped over the
summer; check and reset if necessary.
Burner
Inspect the burner for accumulation of scale on both the
upstream and downstream sides of the mixing plates.
Remove foreign material with a wire brush.
Visually check that all holes in the mixing plates are clear.
If any burner ports are plugged (even partially), clear
them with a piece of wire or another appropriate tool. Do
not enlarge burner ports when clearing a blockage as
performance could be affected.
Replace or tighten any loose or missing fasteners on the
mixing plates. Always use appropriate fasteners.
Inspect and clean the flame rod or UV scanner.
Occasional replacement of the flame rod and spark rod
may be necessary to ensure optimum unit performance.
Gas Train
Check the gas connections, joints and valves annually
for tightness. Apply a soap and water solution to all
piping; watch for bubbling which indicates a leak.
Evaporative Cooling Module
Shut off the water and drain all exposed lines when the
outside temperature drops below 45ºF (7.2ºC).
Clean all interior parts of any mineral deposits or foreign
materials that may have built-up during the cooling season.
Replace any worn or non-functioning parts.
Winterizing Chilled Water Coils
During the winter, chilled water coils must be protected
against freezing. Manufacturer recommends draining
the coils.
Maintenance
Heating/Cooling
