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B
5. Remove
and dispose
of any oil contanfinated
material
per
local codes.
Fan
Shaft
Bearings
Lubricate
bearings
at least every
6 months
with
suitable
bearing
grease.
Typical lubricants
are given below:
MANUFACTURER
Texaco
Mobil
Sunoco
Texaco
LUBRICANT
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2
*Preferred lubricant
because it contains
rust and oxidation
inhibitors.
Fan Motor Bearings
Fan motor
bearings
are of the
permanently
lubricated
type. No
field lubrication
is required.
No lubrication
of the condenser
or
evaporator
motors
are required.
Manual
Outdoor
Air Damper
If manual
outdoor
air damper
blade adjustment
is required,
refer to
Step 8 - Install Outdoor
Air Hood section.
Economizer
Adjustment
If
econonfizer
adjustment
is
required,
refer
to
Optional
EconoMi$er
IV section.
Evaporator
Fan Service and Replacement
The 50PM
units feature
a slide-out
fan deck for easy servicing
of
the indoor-fan
motor,
pulleys,
belt,
and bearings.
To service
components
in this section,
perform
the following
procedure:
1. Turn off unit power.
2. Open the fan section access panel.
3. Remove
three no. 10 screws
at front of slide-out
fan deck.
Save screws. (See Fig. 26.)
4. Fan
deck
can
now
be
slid
out
to
access
serviceable
components.
EQUIPMENT
DAMAGE
HAZARD
Failure to follow
this caution
may result in equipment
damage.
DO
NOT
SLIDE
FAN
DECK
OUT
PAST
THE
STOP
BRACKET.
If further access is required,
the fan deck must be
supported.
Make
sure
plugs
and
wiring
are not
pinched
between
fan housing
and unit center post.
5. To replace
fan deck to operating
position,
slide fan deck
back
into
the unit.
Secure
with
the three
no.
10 screws
removed
in Step 3.
6. Close fan section
access door.
7. Restore
power
to unit.
Evaporator
Fan Performance
Adjustment
(Fig. 26
and 27)
Fan motor pulleys
are factory
set for speed shown
in Table 17.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen
nuts on the 4 carriage
bolts
in the mounting
base.
Using
adjusting
bolts
and plate,
slide
motor
and remove
belt.
3. Loosen movable-pulley
flange
setscrew.
(See Fig. 27.)
4. Screw movable
flange
toward
fixed flange to increase
speed
and
away
from
fixed
flange
to
decrease
speed.
Increasing
fan
speed
increases
load
on motor.
Do
not
exceed maximum
speed specified
in Fan Rpm at Motor Pul-
ley Settings
in Appendix
A.
5. See Appendix
A for air quantity
linfits.
6. Set movable
flange
at nearest
keyway
of pulley
hub and
tighten
setscrew.
(See Table
17 for speed change
for each
full turn of pulley
flange.)
7. Replace
and
tighten
belts
(see
Evaporator
Fan
Belt
Tension
Adjustment
section below).
8. Restore
power
to unit.
To align fan and motor pulleys:
1. Loosen
fan pulley
setscrews.
2. Slide fan pulley
along fan shaft.
3. Make
angular
alignment
by
loosening
motor
from
mounting
plate.
Evaporator
Fan Belt Tension
Adjustment
To adjust belt tension:
1. Turn off unit power.
2. Slide
out
fan
deck
to
service
position
as shown
in
Evaporator
Fan Service
and Replacement
section
above.
3. Loosen fan motor bolts.
4. Move
motor
mounting
plate
to
adjust
to
proper
belt
tension.
(See Table 9.) Motor
adjuster
bolts
may be used to
tighten
belts. (See Fig. 26.)
5. Check for proper belt alignment.
Adjust if necessary.
6. Tighten
motor mounting
plate bolts to lock motor in proper
position.
7. Return fan deck back into operating
position.
8. Restore
power
to unit.
Condenser-Fan
Adjustment
(Fig. 28)
1. Shut off unit power
supply.
2. Remove
condenser-fan
assembly
(grille,
motor,
motor
cover, and fan) and loosen
fan hub setscrews.
3. Adjust
fan height as shown
in Fig. 28.
4. Tighten
setscrews
and replace condenser-fan
assembly.
5. Turn on power
to unit.
FAN
PULLEY
MOTOR
PULLEY
(HIDDEN)
MOTOR
MOUNTING
BASE
SLIDE-OUT
FAN DECK
C07203
Fig. 26 - Evaporator-Fan
Motor
Adjustment
36
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