First Co SHW (2 - 20 Tons) Horizontal Chilled Water - Manual (Page 4)

Blower Speed Adjustment
Adjustment of blower speed is
made by loosening the set screw in
the outer (movable) pulley face and
turning this face half or full turns
only, so that the adjusting set screw
will be positioned precisely over the
flat on the pulley hub. Speed is
reduced by adjusting the pulley
faces so that they are further apart;
speed is increased with faces closer
together. Check all of the pulleys'
set screws for tightness.
Inspection and Cleaning
Before start-up all of the compo-
nents should be given a thorough
check. Optimal operation of this
equipment requires cleanliness.
Often after installation of this equip-
ment additional construction activi-
ties occur. Care must be taken to
protect the equipment from debris
during these construction phases.
MAINTENANCE
To achieve maximum perfor-
mance and service life of each
piece of equipment a formal sched-
ule of regular maintenance should
be established and maintained by a
certified contractor.
The following is provided as a rec-
ommended maintenance schedule.
Specific instructions for mainte-
nance proce
dures are given after the
check list.
Yearly Check List
- Clean the blower motor and oil if
required.
- Inspect the blower coil unit casing
for corrosion and loose fasteners.
- Inspect the blower wheel and
housing. Clean if necessary.
- Check the motor pulley and
blower pulley for alignment and
tighten their set screws. Adjust
belt tension if necessary.
- Inspect all coil connections for
leaks. Inspect the coil fins for
excessive dirt or damage. Clean
or repair if required.
Pulley Alignment and
Belt Tension
Belt tension and pulley alignment
should be checked. Belt tension is
adjusted by means of the motor tail-
piece adjusting bolt or the position of
the motor on the base style motor
mount. A deflection of about 3/4" to
1" per foot of span should be ob-
tained by pressing the belt firmly.
The adjusting bolt should be locked
in position after the adjustment is
made. Alignment of pulley grooves
is made by locating the motor pulley
on the motor shaft or by moving the
entire motor along the motor mount-
ing bracket. For blower speed ad-
justment refer to that section.
****** WARNING ******
Disconnect electrical power and
allow all rotating equipment to
stop before servicing the unit.
Failure to do so may result in
personal injury or death from
electrical shock or entangle-
ment in moving parts.
Motor
Check motor connections to en-
sure that they are secure and made
in accordance with the wiring dia-
gram.
The blower motor should be
cleaned annually and if it has oiling
ports, it should be oiled with a good
grade of SAE 20 oil. Normally a few
drops of oil in each bearing is suffi-
cient.
Coil
Any dust or other contaminants
which accumulate on the heat trans-
fer surfaces interferes with the air
flow and impairs heat transfer. The
coil must be kept clean by any of the
following methods.
1. Cleaning with low pressure
compressed air.
2. Flushing or rinsing with water (a
detergent is advisable for greasy
surfaces).
3. If strainers are installed in the
valve packages, clean the strainers
once a year per manufactures direc-
tions.
Filter
The air filter should be cleaned or
replaced as often as necessary to
prevent restriction of air flow. Al-
ways replace the filter with the same
type as originally furnished.
To clean permanent filters, remove
the filter and wash in water to re-
move the old filter oil. Rinse in
clean, hot water and allow to dry.
Recoat both sides of the filter with
RP filter coat, or an equivalent. Al-
low to drain and dry thoroughly be-
fore reinstalling the filter.
Drain Piping
The drain should always be con-
nected or piped to an acceptable
disposal point sloped away from the
unit. Check the drain line for restric-
tions or blockage before summer
operation and monthly during the
cooling season.
Drain Pan
The drain pan should be clean to
allow proper condensate flow. Re-
move any accumulation of residue
from the drain pan and inspect for
rust and leaks.
Monthly Check List
- Inspect the unit air filters. Clean or
replace as required.
- Inspect the drainpan to be sure it is
clean to permit the flow of conden-
sate through the drain lines.
- Inspect the fan belt for wear and
alignment. Replace or adjust as
required.
Blower
Inspect the bearings for wear. They are
ball bearing, self-aligning and grease
packed. Replace if required. Inspect the
thrust collars for end play and alignment
of wheel. Check the blades for accumu-
lations of dirt and clean
in order to avoid
imbalance and vibration. Check
mounting brackets, base bolts and isola-
tion material.
3/4" to 1" PER
FOOT OF SPAN