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b. Connect ohmmeter across switch terminals. Ohmmeter will indicate resistance if switch is closed (HP1) or
open (HP2) after relieving pressure.
c. Connect switch to a cylinder of dry nitrogen. Refer to
d. Set the nitrogen pressure regulator higher than the switch - over point on switch being tested. Pressure
switch settings points are provided in
.
e. Close the valve on the cylinder and open the bleed-off valve.
f. Open the cylinder valve. While observing the meter, slowly close the bleed-off valve and increase pressure
until the switch opens (HP1) or closes (HP2). Slowly open the bleed-off valve (to decrease pressure) until
the switch reverts to normal position.
g. If the switch does not activate within tolerances provided, replace the switch. Test the new switch before
installation.
5.10 HOT GAS SOLENOID VALVE (HGS1), CONDENSER PRESSURE CONTROL VALVE (HGS2) AND
QUENCH VALVE
5.10.1
Replacing the Solenoid Coil
It is not necessary to remove the refrigerant charge to replace the coil. Refer to
.
a. Remove the coil snap cap, voltage plate and coil assembly. Disconnect the leads and remove the coil junction box if
necessary.
b. Verify the coil type, voltage and frequency. This information appears on the coil voltage plate and the coil housing.
c. Place the new coil over the enclosing tube and then install the voltage plate and snap cap.
Figure 5.4 Typical Switch Setup for Testing Pres-
sure Switches HP 1 and HP2
1. Cylinder valve and gauge
2. Pressure regulator
3. Nitrogen cylinder
4. Pressure gauge (0 to 400 psig = 0 to 28 bars)
5. Bleed-off valve
6. 1/4 inch connection
- - - - -
Figure 5.5 Hot Gas Valve, Condenser Pressure Con-
trol Valve, Quench Valve (Hot Gas Valve Shown)
1. Snap cap
2. Voltage plate
3. Coil assembly
4. Enclosing tube
5. Plunger assembly
6. Valve body assembly
7. Direction of flow
- - - - -