Quantech QWC4, Installation Operation & Maintenance, Page: 136 / 156

QUANTECH
136
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
SECTION 7 - MAINTENANCE
Replacing the Filter Drier
If the eductor flow seems restricted by high eductor
outlet temperatures or if the oil is replaced, replace the
filter using the following instructions to replace the
drier as shown in Figure 66 on page 136.
1. Power down the chiller.
2. Close all 3 service isolation valves (items 1).
3.
Carefully remove any insulation on the filter drier
(item 2), located at the eductor block (item 3).
4. Relieve the pressure from the circuit into a suit-
able refrigerant recovery container. Filter drier
(item 2) contains a Schraeder valve for this pur-
pose.
5. Loosen the roto lock nut (item 4) at the piping end
of the filter drier (item 2).
6. Remove the filter drier from the eductor block and
discard filter drier and Teflon seals (item 5).
7. Install the new Teflon seals (items 5) and filter
drier (item 2).
8. Torque nuts (items 4) at each end of filter drier
(item 2) to 60 ft-lb (81 Nm), and replace the filter
drier insulation.
9. Evacuate the air from the lines to 500 microns.
10. Open all 3 service isolation valves (items 1).
11. Restore power to the chiller, the chiller is now
ready to be placed back into service.
LD16669A
1
5
2
5
4
1
1
3
FIGURE 66 - OIL EDUCTOR ASSEMBLY
TO
CONDENSER
TO
COMPRESSOR