72
NOTES
6. Install new actuator.
7. Install piston and spring with centering guide.
8. Re-install plug.
9. Refill compressor with fluid before operating
C
ONTROL SYSTEM ADJUSMENT
Refer to Figure 6-6. All components in the Control
System are designed and manufactured to close
tolerances to eliminate any need for adjustments.
The only adjustment required is to set the air
pressure switch and pressure regulator valve. This is
done by following the instructions below.
P
RESSURE SWITCH ADJUSTMENT
1. Close ball valve to isolate the pressure regu-
lator valve and set selector switch to manual.
2. Remove the pressure switch cover.
3. With the shut-off valve closed or slightly
cracked open, start the compressor.
4. Observe the line pressure gauge and pres-
sure switch contacts. When the line pressure
reaches nameplate pressure, the pressure
switch contacts should open.
5. If the pressure switch contacts do not open
or they open prior to the desired pressure,
the pressure switch setting will require
adjustment(refer to Figure 6-6). To adjust the
pressure switch, turn the range adjusting
screw to the high-pressure setting equally.
6. Replace pressure switch cover.
P
RESSURE REGULATOR ADJUSTMENT
1. Establish correct pressure switch adjustment
by following the above procedure.
2. Lower line pressure by opening the shut-off
valve until the compressor reloads.
3. Loosen the pressure regulator locknut and
open ball valve.
4. Close shut-off valve; the pressure will
increase depending on the setting of the reg-
ulator adjustment screw. Tighten adjustment
screw until the line pressure gauge reads a
pressure of 5 psi/ 0.34 bar below the pres-
sure switch setting established in Table 6-2.
5. Open shut-off valve and observe operation.
1.Thermostat Acutor (I) 2.Piston 3.Pin 4.O-ring
5.Plug 6.Guide 7.Spring
(I) Repair Kit P/N 250028-036
DANGER
DO NOT touch the electrical contacts, ter-
minal or leads with any part of the body or
any uninsulated metallic object. Severe
electrical shock may occur.
Figure 6-5: Thermostat Actuator
(P/N 250025-413)
1.Contact #2 2.Differential 3.Pressure
Range Screw
4.Contact #1 5.Ground Screw 6.Optional
Ground
Figure 6-6: Air Pressure Switch (P/N 250025-299)
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