It is recommended to clean the evaporator coil on aIt is recommended to clean the evaporator coil on a
remove any grease or oil film which sometimes coatsremove any grease or oil film which sometimes coats
the fins and the fins and
from draining into the drainfrom draining into the drain
Therefore, several washings may be necessary.Therefore, several washings may be necessary.
Spray coil with a mild detergent solution such asSpray coil with a mild detergent solution such as
clean water at mild pressure. A garden hose withclean water at mild pressure. A garden hose with
spray nozzle is usually sufficient. Make sure drainspray nozzle is usually sufficient. Make sure drain
lines are clean.lines are clean.
Run unit until defrost mode can Run unit until defrost mode can
be initiated to checkbe initiated to check
for proper draining from drain pan.for proper draining from drain pan.
Remove all foreign material from the condenser coilRemove all foreign material from the condenser coil
necessary to use warm water mixed with any goodnecessary to use warm water mixed with any good
water if a detergent is used.water if a detergent is used.
itself will damage the cooling system.itself will damage the cooling system.
low silicate anti low silicate anti
PRESSURE REGULATING VALVE (CPR)PRESSURE REGULATING VALVE (CPR)
The CPR valve is factory pre-set and should notThe CPR valve is factory pre-set and should not
any reason, proceed with the following outline.any reason, proceed with the following outline.
When adjusting the CPR valve, the unit must beWhen adjusting the CPR valve, the unit must be
the high speed heat the high speed heat
To adjust the CPR valve, proceed as follows :To adjust the CPR valve, proceed as follows :
Install a manifoInstall a manifo
ld gauge set.ld gauge set.
Remove cap (item 1) from CPR valve.Remove cap (item 1) from CPR valve.
 With an 8 mm Allen wrench, loosen the jam nut With an 8 mm Allen wrench, loosen the jam nut
mm Allen wrenchmm Allen wrench
screw. To raise the suction pressure turn the settingscrew. To raise the suction pressure turn the setting
setting screw setting screw
nut securely againut securely agai
setting screw (item 3). setting screw (item 3).
the setting screw the setting screw
to vibrations in the unit. Replace the cap.to vibrations in the unit. Replace the cap.
which maintains constant superheat of the refrigerantwhich maintains constant superheat of the refrigerant
response of refrigerant flow to match the evaporatorresponse of refrigerant flow to match the evaporator
load and (b) prevention of liquid refrigeload and (b) prevention of liquid refrige
rant enteringrant entering
compressor. Unless the valve is defective, it seldomcompressor. Unless the valve is defective, it seldom
requires any maintenance.requires any maintenance.
to section 4.5.a.)to section 4.5.a.)
e insulation from expansie insulation from expansi
on valve bulb andon valve bulb and
then remove bulb from suction line.then remove bulb from suction line.
remove expansion valve.remove expansion valve.
calibrated orifice.calibrated orifice.
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