Trane CVGF500 Installation, Operation & Maintenance Manual page 122

Periodic Maintenance
7.
8. Install a new oil filter, o-ring, and Roto-Lock nylon seal.
9. Replace the oil filter cover and torque the bolts and Roto-Lock connector. The cover
10. Evacuate the oil filter cavity by attaching a deep vacuum pump to the 1/4 inch
11. Replace the Schrader valve cap and tighten.
12. Open both isolation valves.
13. On the Large display ™ display, select Settings, Mode overrides and select Oil
14. Check the oil level in the sump and if it is below the center of the lower sight glass,
Oil Sump Heaters
The CVGF uses two 500 watt heaters to maintain the oil sump temperature at 136°F
(57.7°C). These heaters are located in the lower oil sump casting, one on each side of
the oil sump cover, and can be serviced without removing the refrigerant or oil, since
the heaters are not located in the oil sump itself but in the casting (See Figure 40).
The AdaptiView will not allow the chiller to start unless the oil sump temperature is
at least 30°F (16°C) above saturated evaporator temperature, or at least 105°F (58°C),
whichever is higher. The oil sump comes factory insulated and must remain insulated
to allow the oil temperature to maintain 136°F (57.7°C) while the unit is off.
The oil heaters are only energized during the unit "off" cycle to maintain oil tempera-
ture for startup. During the run cycle, the oil sump heaters are de-energized and the oil
temperature may vary depending on load and operating conditions. The unit will trip
on a latching diagnostic of high oil temperature if the oil exceeds 165°F (74°C).
Oil Pressure Protection
A differential oil pressure switch provides protection for the CVGF should the oil pres-
sure fall below safe operating levels for any reason. This switch opens at 9 psid (62kPa)
and closes at 12 psid (82 kPa). The oil pressure regulator is factory set to maintain oil
pressure between 18 to 22 psid (124-151 kPa). The unit will not start if the oil pressure
is below 12 psid (82 kPa).
Adjusting the Oil Pressure Regulating Valve
The oil pressure regulator should be calibrated to maintain 18 to 22 psid during com-
missioning. In the event that the oil pressure switch will not close to allow unit startup,
the following diagnostic procedure should be followed:
1.
2. On the Large display ™ display, select Settings, Mode overrides and select Oil
122
Remove the oil filter and o-ring.
is torqued to 19 lb-ft (2.62 N-m) and the Roto-Lock to 90 lb-ft (12.44 N-m).
Schrader valve and pulling at least a 500 micron (0.5 mm Hg) vacuum. Do a stand-
ing vacuum rise test to determine if any leaks are present. If leak free, remove the
vacuum pump from the valve.
Pump. Start and run the oil pump in manual mode to charge the oil filter with oil.
Allow the pump to run for several minutes and shut the oil pump off by going back
to the Auto mode at the control panel.
add oil by following the oil charging procedure outlined previously.
With the unit and the oil pump off, connect a pressure gauge to the service valve
after the oil filter and another gauge to the Schrader valve located next to the oil
pressure switch capillary on the oil sump. (An optional method is to use a differen-
tial pressure gauge instead of two separate gauges.)
CVGF-SVX03B-EN