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7–17
T-354
6. Open cylinder valve. Slowly close bleed-off valve to increase pressure on switch. The switch should open at
a static pressure up to 25kg/cm
(350psig). If a light is used, light will go out. If an ohmmeter is used, the
meter will indicate open circuit.
7. Slowly open bleed-off valve to decrease the pressure. The switch should close at 18kg/cm
(250psig).
Figure 7.16 High Pressure Switch Testing
1. Cylinder Valve and Gauge
2. Pressure Regulator
3. Nitrogen Cylinder
4. Pressure Gauge (0 to 36 kg/cm2 = 0 to 400 psig)
5. Bleed-Off Valve
6. 1/4 inch Connection
- - - - -
7.10 CONDENSER COIL
The condenser consists of a series of parallel copper tubes expanded into copper fins. The condenser coil must be
cleaned with fresh water or steam so the air flow is not restricted. To replace the coil, do the following:
WARNING
!
Do not open the condenser fan grille before turning power OFF and disconnecting power plug.
1. Using a refrigerant reclaim system, remove the refrigerant charge.
2. Remove the condenser coil guard.
3. Unsolder discharge line and remove the line to the receiver or water-cooled condenser.
4. Remove coil mounting hardware and remove the coil.
5. Install replacement coil and solder connections.
6. Leak-check the coil connections per paragraph
. Evacuate the unit per
then charge
the unit with refrigerant per
7.11 CONDENSER FAN AND MOTOR ASSEMBLY
WARNING
!
Do not open condenser fan grille before turning power OFF and disconnecting power plug.
The condenser fan rotates counter-clockwise (viewed from front of unit), pulls air through the condenser coil and
discharges horizontally through the front of the unit. To replace motor assembly:
1. Open condenser fan screen guard.
2. Loosen two square head set screws on fan (thread sealer has been applied to set screws at installation).
Disconnect wiring from motor junction box.
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