Greenheck TSU Direct Gas Manual (456857) - Manual (Page 9)

9
MAINTENANCE
Greenheck recommends these procedures to insure trouble free operation of this unit. It is especially important to
maintain gas heater units for clean and efficient operation. Most unit failures can be attributed to poor setup or
poor maintenance.
A record of maintenance performed on this unit should be kept. This information will provide essential information
if problems are encountered. A section at the back of this manual is provided for recording the unit's maintenance
history.
CAUTION: When performing any maintenance on this unit be sure that the power is disconnected and
cannot be accidentally turned on. The control center disconnect can be locked in the off position.
Yearly
The burner system should be inspected for accumulation of scale on both the upstream and downstream sides
of the mixing plates. Any scaling or foreign material should be removed with a wire brush. Check visually that no
holes in the mixing plates are blocked. If any burner ports are plugged (even partially) clear them with a piece of
wire or a #47 drill bit.
WARNING: Do not enlarge burner ports or performance may be drastically affected.
If any mixing plates are loose or missing fasteners, tighten/replace as necessary. Always use zinc plated or
stainless fasteners.
After inspection and cleaning, put system back into operation and if possible view from downstream side while
cycling burner through full firing range. This will give a visual check for blocked burner ports.
Observe flame pattern and if necessary, take steps to correct velocity and/or air distribution problems.
Flame rods can last many years, but because of the high heat and expansion and contraction on the porcelain,
flame rods can fail. Nuisance shutdowns of the burner can be caused by cracks in the flame rod porcelain. Some
cracks may be too small to be seen with the naked eye, but will still cause shutdowns. Inspection, cleaning, and
occasional replacement of the flame rods and spark rods may be necessary to insure optimum unit performance.
Beginning of the heating season
1. Turn the main gas valve to the “on” position.
2. The summer/off/winter switch should be switched to the winter position (in the heater box if provided).
3. The unit should be allowed to operate. Inspect the flame through the burner view port to make sure it is
operating normally. Turn off the main gas to make sure the flame safeguard locks on safety.
End of the heating season
1. Turn the summer/off/winter switch to the summer position (in the heater box if provided).
2. Turn the main gas valve to the off position for the summer.