Section 6
MAINTENANCE
20
Figure 6 ---4 Minimum Pressure/Check Valve
(P/N 606058)
* Repair Kit P/N 250030---226
CAP
VALVE
SPRING*
O --- R I N G *
CHECK
SPRING*
VALVE
STEM
VALVE
SEAT*
WASHER
SCREW
4. Remove the screw holding the check valve seat.
Replace valve seat. Reinstall securing with Loc-
titeR #222.
5. Install new o---ring. Before reinstallation, lubri-
cate with Parker Super “O” ring seal or an equiv-
alent grease.
6. Reinstall the whole valve assembly. Tighten and
secure.
THERMOSTAT ACTUATOR MAINTENANCE
Refer to Figure 6---5. The only part which would
ever need replacement is the thermostat valve ac-
tuator. For replacement, follow the procedure ex-
plained below.
WARNING
!
Before doing compressor maintenance, discon-
nect compressor from power source and lock out
power source. Isolate compressor from line pres-
sure by closing r ecommended discharge shut---
off valve and releasing all internal pressure from
compressor.
1. To prevent spilla ge and loss of re---usable fluid,
place a contaminate---free fluid receptacle be-
neath fluid drain valve and fluid filt er.
2. Drain fluid by removing fluid drain cap at t ee lo-
cated beneath compressor.
3. Unscrew and remove hollow hex plug.
4. Remove spring and piston.
5. By using long nosed pliers, pull the actuator out.
6. Install new actuator.
7. Install piston and spring with centering guide.
8 . R e --- i n s t a l l p l u g .
COIL REPLACEMENT
1. Remove the retaining cap, nameplate and cover.
2. Slip the yoke containing the coil and sleeves off
the solenoid base subassembly.
3. Reassemble in reverse order of disassembly.
CONTROL SYSTEM ADJUSTMENT
Refer t o Figure 6---6. Prior to adjusting the Control
System, it is necessary to determine the desired
operating pressure range and also the maximum
pressure at which your compressor is to operate.
The pressure must not exceed the maximum oper -
ating pressure which is stamped on the compres-
sor serial number nameplate. The following expla-
nation applies to a typical installation with a desired
operating range of 7.9 to 8.6 bar. This information
will apply to a compressor with any other operating
range excepting the s tated pressures.
Remove the cover of the pressure switch. With the
shut---off valve closed (or slightly cracked open)
start t he compressor. Observe the line pressure
gauge and pressure switch contacts. When the line
pressure reaches 8.6 bar, the pressure switch con-
tacts should open. If the pressure switch contacts
do not open or they open prior to the desired pres-
sure, the pressure sw itch setting w ill require adjust-
ment (refer to Figure 6---6).
FOR PRESSURE RANGE ADJUSTMENT:
1. Remove cover to pressure switch.
2. Turn the range adjusting screw to the high pres-
sure setting. Turning the screw counterclock-
wise lowers both the high and low pressure
equally.
FOR DIFFERENTIAL ADJUSTMENT:
Differential is the difference between the high a nd
low pressure settings; 0.7 bar is typical.
Figure 6 ---5 Thermostat Actuator (P/N 250025 ---413)
* Repair Kit P/N 250028---036
PLUG
O --- R I N G
GUIDE
PIN
SPRING
PISTON
THERMOSTAT
ACTUATOR*
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