. CAUTION:
The
discharge
line valve
must
be open
before
starting
the
compres-
sor
.
Liquid
line valves
must
also be open
for
sustained
operation
.
All compressors are soli a mountea on 1sopads, therefore,
compressor
hold-down
bolts
must
not
be loosened.
Loosening
these
bolts
will
cause excessive
vibration
of
the
compressor
and may result in
refrigerant
line breakage.
Prior
to
start-up
check
all
compressor
hold-down
bolts
for
tightness.
MAINTENANCE
CONDENSER
Units
equipped
with belt drive fans have
inherently
protected
motors
. Fan belts, fan
bearings
and
motor
bearings
require
periodic
maintenance
as
follows:
1. Fan Belts
-After
two
(2) weeks
operat
i
on
,
the
belts will have
nearly
reached
their
permanent
stretch,
therefore
, each belt
should
be
checked
again and
proper
adjustments
made.
To
maintain
good
fan and
motor
operation
, the belt tension
should
be
checked at three (3)
month
intervals.
2.
Fan
Bearings-
Each fan shaft is
prov
i
ded
with
ball
bearings
of
the
relubricatable
type
. Each bearing is provided
with
grease
fittings,
accessible
through
the
individual
motor
access panels. It
is
recommended
the bearings be greased
by
adding
4
to
5 shots
with
a hand
gun
. The suggested greasing interval is
indicated
on a
sticker
attached to the unit.
3.
Motor
Bearings-
Each
motor
is
equipped
with
ball bearings. Ball
bearings
consume
a very small
amount
of
lubricant
,
but
enough
must
be
present
at all
time
to prevent
motor
injury.
The
length
of
time
a bearing can run
without
having grease added
or
replaced
will
depend
upon
the
operating
conditions
.
Under
normal
operating
conditions
, the
motor
bearings
should
be
lubricated
at
2000
hour
operating
intervals
.
The
lubricant
should
be
from
a
clean closed
container
and
should
be an
anti-friction
type
bearing
grease-free
from
solid
fillers
or
other
harmful
ingredients
.
Lubricant
should
have a safe
operating
temperature
of
2000° F.
The
air
inlet
of
the
condenser
coil
should
be
kept
clean
through
a
regular
preventative
maintenance
program
.
COMPRESSOR
1.
OIL LEVEL -
The
oil
level in the
compressor(s)
should
be
checked
periodically,
with
the
compressor
either
running
or
stopped
. If
the
oil
level is
below
one-half
(
'12
) the
sight
glass, oil
must be added.
Oil
should
be added
only
with
the
compressor
shut
off
.
To
do
so,
turn
the
return
water
thermostat
(T1) to a
higher
temperature
setting
, and
wait
for
the
unit
to
pumpdown
and
shutoff.
Place the
system "
ON-OFF
"
switch
in the "OFF"
position
. Close
the
line
valve in the
discharge
line between
compressor
and
condenser
.
Refrigerant
pressure
inside
of
the
compressor
will
now
be
approximately
80 to 90 PSI G.
The
low
pressure
cut-out
setting is
35 PSIG,
but
the residual
discharge
pressure (upstream
of
the
discharge
check
valve)
will
equalize
back
into
the
suction
side
after
the
compressor
stops.
3
Locate
the
discharge
pressure
port
adjacent
to
solenoid
valve
UL-3
(see
drawing
below)
; remove
the
cap and release the
residual pressure
by
pushing
in on the pressure
port
fitting
itself.
Pump
oil
into
this
flU'
t
u11til
u,.,
uil
level
Is
to the
tOP
Of
the
sight
glass.
Replace the
discharge
port
cap
. Re-open the discharge line valve.
Do not
allow compressor to run with discharge valve closed.
Place
the
system
"ON-OFF"
switch
in
the
"
ON
"
position
.
Using
a
jumper
wire, make a
"short
"
for
five (5)
seconds
between
terminal
#4
on
terminal
block
TER5 and the
switched
terminal
of
a
solenoid
valve
feeding
the
circuit
you
have
just
"blown
" (e.g.
terminal
#121
on TER4 to energize
SOL
1 ). Reset return
water
thermostat
(~1)
to
the
operat
ional
temperature
setting and
allow
unit
to
return
to
normal
operation
.
2.
RECOMMENDED
OIL-
The
unit
is
factory-charged
with
BOHN
SR-30
refrigeration
oil.
Do not add any other type of oil
to
this factory charge.
Do not operate compressor
If
oil level
is
below one-half
('h)
sight
glass.
If
the
oil
level is
below
the
minimum
specified
above, and
BOHN
SR-30 is
not
on hand, you may drain the entire factory oil charge,
then refill
with
SUN ISO 4GS
refrigeration
oil. The
factory
(BOHN)
oil is
of
the
synthetic
type
and will not mix
with
SUN
ISO 4GS. Do
not
attempt
to
operate
the
screw
compressor
with
any
oil
other
than these
two
specified above.
It
is
suggested
that
a
gallon
or
more
of
BOHN
SR-30
oil
be
obtained
and kept on
hand
at the
job
site. The
substitution
of
SUNISO
4GS oil, as
outlined
above,
will
result
in a
2%
to
4%
capacity
loss, and
no
reduction
in
input
K.W.
3.
COMPRESSOR REPAIRS (Internal) -
Contact
factory
or
an
authorized
BOHN
Service
Agency
if a
compressor
malfunction
is
suspected.
4. COMPRESSOR REPAIRS (External) -
Proper
operation
of
unloaded
start,
loading
, and
unloading
is
controlled
by solenoid
valves UL-1 ,
UL-2
and UL-3.
Any
of
these three (3) solenoid valves
may be repaired
or
replaced in the field,
as
required.
HIGH
PRESSURE
PORT
To Next Page
Loading...