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MAINTENANCE / SERVICE
All heating equipment should be serviced before each heating
season to assure proper operations. The following items may be
required to have more frequent service scheduled based on the
environment in which the unit is installed, and the frequency of
the equipment operation.
Motors
A. Cleaning
Remove grease and dirt on motor during each inspection
or lubrication. Open frame motors should be blown clean
every heating season, or whenever condensers are cleaned,
whichever is sooner.
B. Lubrication
1. Lubricate motor according to manufacturer's instructions
located on the motor.
2. When no motor oiling instructions are on the motor, oil
the motor every two thousand hours of operation with
SAE20 motor oil for units in normal applications. Adjust
oiling according to usage and atmosphere.
3. Some motors do not have oil fittings. These motors are
lubricated for long life and do not require further lubrication.
C. Overload Protection
A change in line voltage higher or lower than motor nameplate
rating may cause overheating and serious motor damage.
Check plant voltage conditions. A separate manual starter with
thermal overload protection device is recommended for those
units that do not have motors with built-in overload protection.
Condensers
A. Cleaning
Clean condenser at least once a year; more often under
unfavorable conditions. Unless condenser is kept reasonably
free of dirt, lint and grease, its original heating capacity will be
reduced — possibly to a serious degree, and motor damage
may result.
Two commonly used cleaning methods are:
1. Loosen dirt by brushing fins on side where air enters
condenser and then turn on fan to blow dirt from unit.
2. Use high pressure air hose to loosen dirt by blowing from
side where air leaves condenser (side adjacent to louvers on
blow-through units; side adjacent to fan on draw-through units).
For thorough cleaning of condenser, remove motor and fan and
spray a mild alkaline cleaning solution over the condenser. After
a few minutes, follow by a hot water rinse. (A steam gun can be
used for spraying cleaning solution and hot water.)
Condensers subjected to corrosive fumes should be checked
and cleaned frequently.
Figure 14.1
Model Identification Plate
14
B. Internal Corrosion Safeguards
1. Provide controlled water treatment — don't use excess of
boiler compounds. Contact your boiler compound supplier for
proper usage or the services of a water treatment laboratory.
2. Periodic internal flushing of the coils is recommended in
areas where water supply is suspected of causing scale.
Use an alkaline-chelant solution and introduce it at the main
pump of the hydronic system. Flush thoroughly.
WARNING: USING INORGANIC OR MINERAL ACIDS SUCH
AS MURIATIC (HYDROCHLORIC) ACID, EVEN THOUGH
INHIBITED, AMY LEAD TO SEVERE DAMAGE, INCLUDING
CORROSION AND LEAKAGE.
3. De-aerate boiler feed-water (particularly if large amount of
new water is used).
4. Insure rapid continuous and adequate condensate drainage
by properly sized and installed traps and piping. Check traps
for sticking. Clean strainers ahead of traps. (When traps
don't work, condensate accumulates in unit heater coil; water
hammer results.)
5.Adequately vent each unit.
6.Use low pressure steam when possible.
Casings
A. Cleaning
Periodic cleaning of casings is recommended to remove dirt,
grease and corrosive substances that may injure finish. Rusted
or corroded spots should be cleaned and repainted.
B. General Inspection
Tighten fan guard and motor bracket. Check fan for proper
clearance, free rotation and firm connection to shaft.
When servicing is complete, tag unit to indicate date of
inspection, lubrication and cleaning.
SERVICE
If a qualified service person cannot solve the problem,
consult your local gas company of local Modine
reppresentative.
When servicing, repairing or replacing parts on these units
always give the complete Model Number and Serial Number
from the unit identification plate. (See Figure 14.1)
Replacement Parts
When requesting parts please contact your local representative.
Please have full model and serial number available.
1-550.25
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