4-16
4-16
It is recommended to clean the evaporator coil on a
It is recommended to clean the evaporator coil on a
re
regu
gula
larr ba
basi
sis,
s, no
nott on
only
ly to
to rem
remov
ove
e ca
cardb
rdboa
oard
rd du
dust, but
st, but to
to
remove any grease or oil film which sometimes coats
remove any grease or oil film which sometimes coats
the fins and
the fins and preven
prevents water
ts water from draining into the drain
from draining into the drain
pan.
pan.
Card
Cardboa
board
rd fib
fiber
er par
particl
ticles
es afte
after
r bei
being
ng wett
wetted
ed and
and
dr
drie
ied
d se
seve
vera
ral l tim
times
es ca
can
n be
be ve
very
ry ha
hard
rd to
to rem
remov
ove.
e.
Therefore, several washings may be necessary.
Therefore, several washings may be necessary.
a.
a.
Rem
Remove
ove rub
rubber check
ber check val
valves (Kazoo
ves (Kazoo)
) from drain
from drain
lines.
lines.
b.
b.
Spray coil with a mild detergent solution such as
Spray coil with a mild detergent solution such as
Oaki
Oakite
te 164
164 or
or any
any goo
good
d com
commerc
mercial
ial gra
grade
de auto
automati
maticc
di
dish
sh wa
wash
sher
er de
dete
terg
rgen
ent
t su
such
ch as
as El
Elec
ectr
tros
osol
ol or
or
Ca
Casc
scad
ade
e an
and
d le
lett the
the so
solu
lutio
tion
n sta
stand
nd fo
forr a
a few
few mi
minu
nutes
tes
and revers
and reverse
e flus
flush
h (op
(oppos
posite
ite nor
normal air
mal air flow
flow)
) with
with
clean water at mild pressure. A garden hose with
clean water at mild pressure. A garden hose with
spray nozzle is usually sufficient. Make sure drain
spray nozzle is usually sufficient. Make sure drain
lines are clean.
lines are clean.
c.
c.
Run unit until defrost mode can
Run unit until defrost mode can be initiated to check
be initiated to check
for proper draining from drain pan.
for proper draining from drain pan.
4.
4.16
16.2
.2
Co
Conde
ndens
nser
er coi
coill
Remove all foreign material from the condenser coil
Remove all foreign material from the condenser coil
by
by re
reve
versi
rsing
ng the
the no
norm
rmal
al ai
airr flo
flow
w.. (Ai
(Air
r is
is pu
pulllled in
ed in thr
throu
ough
gh
the
the fro
front
nt an
and
d di
disch
scharg
arges
es ov
over
er the
the en
engi
gine
ne.)
.) Co
Comp
mpre
resse
ssed
d
ai
air or
r or wa
water ma
ter mayy be us
be used
ed as a
as a cl
clea
eani
ning ag
ng agen
ent.
t. It may
It may be
be
necessary to use warm water mixed with any good
necessary to use warm water mixed with any good
com
commerc
mercial
ial dis
dishwa
hwashe
sherr dete
deterge
rgent.
nt. Rin
Rinse
se coi
coill with
with fres
fresh
h
water if a detergent is used.
water if a detergent is used.
CAUTION
CAUTION
Use
Use only
only eth
ethyle
ylene
ne glyc
glycol
ol anti-
anti-fre
freeze
eze
(wi
(with inh
th inhibit
ibitors
ors)) in sy
in syste
stem
m as
as glyc
glycol
ol by
by
itself will damage the cooling system.
itself will damage the cooling system.
Al
Alwa
ways
ys add
add pr
pre-
e-mi
mixe
xed
d 50
50/5
/50
0 ant
anti
i --
fre
freeze
eze and
and wat
water
er to
to rad
radiat
iator/
or/engi
engine.
ne.
N
Ne
ev
ve
er
r e
ex
xc
ce
ee
ed
d m
mor
ore
e ttha
han
n a
a 5
50
0%
%
conc
concentr
entrati
ation
on of
of anti
anti -
- fre
freeze
eze.
. Use a
Use a
low silicate anti
low silicate anti - freeze.
- freeze.
4.17
4.17 ADJU
ADJUSTING
STING THE
THE COMPR
COMPRESSOR
ESSOR
PRESSURE REGULATING VALVE (CPR)
PRESSURE REGULATING VALVE (CPR)
The CPR valve is factory pre-set and should not
The CPR valve is factory pre-set and should not
ne
need
ed ad
adju
justm
stmen
ent.
t. If
If it
it is
is ne
nece
cess
ssaryto
aryto ad
adju
just
st the
the va
valv
lve
e for
for
any reason, proceed with the following outline.
any reason, proceed with the following outline.
When adjusting the CPR valve, the unit must be
When adjusting the CPR valve, the unit must be
run
runnin
ning
g in
in the high speed heat
the high speed heat or defros
or defrost.
t. This will
This will
en
ensu
sure
re a
a su
sucti
ction
on pr
pres
essu
sure
re ab
abov
ove
e the
the pr
prop
oper
er CPR
CPR
setting.
setting.
1
1.
. C
Ca
ap
p
2
2.
. JJa
am
m n
nu
ut
t
3
3.
. S
Se
ettttiin
ng
g ssccrre
ew
w
1
1.
.
2
2. 3
. 3..
Figure 4-1
Figure 4-11
1 Compre
Compressor pressur
ssor pressure regulating
e regulating
valve
valve
To adjust the CPR valve, proceed as follows :
To adjust the CPR valve, proceed as follows :
a.
a.
Install a manifo
Install a manifold gauge set.
ld gauge set.
b.
b.
Remove cap (item 1) from CPR valve.
Remove cap (item 1) from CPR valve.
c.
c.
With an 8 mm Allen wrench, loosen the jam nut
With an 8 mm Allen wrench, loosen the jam nut
(Figure 4-1
(Figure 4-11,
1, item 2).
item 2).
d.
d.
Usin
Using
g the 8
the 8 mm Allen wrench
mm Allen wrench, , adj
adjust the
ust the sett
setting
ing
screw. To raise the suction pressure turn the setting
screw. To raise the suction pressure turn the setting
sc
scre
rew
w (it
(item
em 3)
3) cl
cloc
ockwi
kwise
se; ; to
to lo
lowe
wer
r the suct
the suctio
ion
n
pressu
pressure,
re, turn the
turn the setting screw
setting screw counte
counterclockw
rclockwise.
ise.
e.
e.
Wh
When
en the
the se
setti
tting
ng ha
hass be
been
en ad
adju
juste
sted,
d, tig
tighte
hten th
n the
e ja
jam
m
nut securely agai
nut securely against the
nst the setting screw (item 3).
setting screw (item 3). This
This
will preven
will prevent t any movemen
any movement of
t of the setting screw
the setting screw due
due
to vibrations in the unit. Replace the cap.
to vibrations in the unit. Replace the cap.
4.18
4.18 THERMOST
THERMOSTA
ATIC EXP
TIC EXPANSION
ANSION V
VALVE
ALVE
The the
The thermal ex
rmal expansi
pansion
on valve i
valve iss an auto
an automatic
matic devic
device
e
which maintains constant superheat of the refrigerant
which maintains constant superheat of the refrigerant
ga
gas
s le
leav
avin
ing
g the
the ev
evap
apor
orato
ator
r re
rega
gardl
rdles
ess
s of
of su
sucti
ction
on
pre
pressu
ssure.
re. The
The va
valv
lve
e fun
functi
ction
ons
s ar
are:
e: (a
(a)
) au
autom
tomati
aticc
response of refrigerant flow to match the evaporator
response of refrigerant flow to match the evaporator
load and (b) prevention of liquid refrige
load and (b) prevention of liquid refrigerant entering
rant entering the
the
compressor. Unless the valve is defective, it seldom
compressor. Unless the valve is defective, it seldom
requires any maintenance.
requires any maintenance.
a.
a. Repla
Replacing expa
cing expansion valv
nsion valve
e
1. Pum
1. Pump
p do
down
wn theunit
theunit by
by cl
clos
osin
ing
g th
the
e Ki
King
ng va
valv
lve.
e. (R
(Refe
eferr
to section 4.5.a.)
to section 4.5.a.)
2.
2. Remov
Remove insulation from expansi
e insulation from expansion valve bulb and
on valve bulb and
then remove bulb from suction line.
then remove bulb from suction line.
3.
3. Lo
Loos
osen
en in
inle
let t an
and
d ou
outle
tlet t an
and
d eq
equa
ualilize
zer
r nu
nuts
ts an
and
d
remove expansion valve.
remove expansion valve.
4.
4. Che
Check for
ck for fore
foreign mate
ign materia
rial l in valve bod
in valve body
y and /
and / or
or
calibrated orifice.
calibrated orifice.