Greenheck DGK (468695) - Manual (Page 17)

17
V-Belt Drives — V-belt drives must be checked on
a regular basis for wear, tension, alignment and dirt
accumulation. Check the alignment by using a straight
edge across both sheaves as shown. Check the tension
by measuring the deflection in the belt as shown.
• Improper belt tension and/or misaligned sheaves
lead to premature and frequent belt failures.
Abnormally high belt tension or drive misalignment
will cause excessive bearing loads and may result
in failure of fan and/or motor bearings. Abnormally
low belt tension will cause squealing on start-up,
excessive belt flutter, slippage and overheated
sheaves.
• Do not pry belts on or off the sheave. Loosen belt
tension until belts can be removed by gently lifting
them off of the sheaves.
• When replacing V-belts on multiple groove drives,
all belts should be changed to provide uniform drive
loading.
• Do not install new belts on worn sheaves. If the
sheaves have grooves worn in them, they must be
replaced before new belts are installed.
Motors – Motor maintenance is generally limited to
cleaning and lubrication (where applicable).
Cleaning should be limited to exterior surfaces only.
Removing dust and grease build-up on the motor
assures proper motor cooling.
Motors supplied with grease fittings should be
greased in accordance with the manufacturer’s
recommendations.
• Greasing of motors is only intended when fittings are
provided. Many motors are permanently lubricated
and will not require additional lubrication.
Maintenance — Routine
Deflection = Belt Span
64
Belt Span
FAN FAN
MOTOR MOTOR
CAUTION
Lock-out the gas and the electrical power to the
unit before performing any maintenance or service
operations to this unit.
Wheels – Wheels require little attention when moving
clean air. Occasionally, oil and dust may accumulate
on the wheel causing imbalance. When this occurs the
wheel and housing should be cleaned to assure proper
operation.
Filters – Filter maintenance is generally limited to
cleaning and replacement. The aluminum mesh filters
can be washed in warm soapy water. An adhesive spray
can be added to increase the filter efficiency.
• Be sure to reinstall filters with the airflow in the
correct direction. An airflow direction arrow is
located on the side of the filters.
• Replacement filters should be from the same
manufacturer and be the same size as the original
filters provided with the unit.
CAUTION
Do not allow water or solvents to enter the motor or
bearings. Under no circumstances should motors or
bearings be sprayed with steam, water or solvents.
Maintenance — Fall
Start-Up — Repeat the Blower Start-Up procedure #4
and Direct Gas Start-Up procedure #1 and #2. 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. It should be checked and reset if
necessary
Burner — Inspect the burner for accumulation of scales
on both the upstream and downstream sides of the
mixing plates. Any scaling or foreign material should be
removed 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, performance could be affected.
Replace or tighten any loose or missing fasteners on the
mixing plates. Always use zinc plated or stainless steel
fasteners.
Inspect and clean the flame and spark rod. Occasional
replacement of the flame rod and spark rod may be
necessary to ensure optimum unit performance. Flame
rods can last many years, but because of thermal
expansion of the porcelain, flame rods can fail over time.
Gas Train — The gas connections, joints and valves
should be checked annually for tightness. Apply a soap
and water solution to all piping; watch for bubbling
which indicates a leak. Other leak testing methods can
be used.
Model DGK Make-Up Air
®