Vfd Refrigerant Strainer (If Equipped); Oil Reclaim Filter; Inspect Refrigerant Float System - Carrier AquaEdge 19XR Series Start-Up, Operation And Maintenance Instructions Manual

VFD Refrigerant Strainer (if equipped)

A refrigerant strainer is located in the
frigerant to the VFD. The strainer should be replaced once a year
or more often if the strainer condition indicates a need for more
frequent replacement. Change the filter by closing the refrigerant
cooling line isolation valves. Refrigerant pressure can be relieved
through access valves on the strainer housing. Tighten
nuts to 55 to 66 ft-lb (75 to 89 Nm).

Oil Reclaim Filter

The oil reclaim system has a strainer on the eductor suction line, a
strainer on the discharge pressure line, and a filter on the cooler
scavenging line. Replace the filter once every 5 years or when the
machine is opened for service. This filter does not contain desic-
cant for moisture removal, so changing the filter will not change
the moisture indicator status. Change the filter by closing the filter
isolation valves and slowly opening the flare fitting with a wrench
and back-up wrench to relieve the pressure. Change the strainers
once every 5 years or whenever refrigerant is evacuated from the
cooler.

Inspect Refrigerant Float System

Perform this inspection only if the following symptoms are seen.
• There is a simultaneous drop in cooler pressure and in-
crease in condenser pressure. This will be accompanied by
an increase in kW/Ton.
• The liquid line downstream of the float valve feels warm.
This indicates condenser gas flowing past the float. An in-
crease in kW/Ton will also occur.
1. Transfer the refrigerant into the cooler vessel or into a
pumpout storage tank.
2. Remove the float access cover.
3. Clean the chamber and valve assembly thoroughly. Be
sure the valve moves freely. Ensure that all openings are
free of obstructions.
4. Examine the cover gasket and replace if necessary. For lin-
ear style float valves inspect the orientation of the float
slide pin. It must be pointed toward the bubbler tube for
proper operation.
Note there are two styles of float valves in use on the 19XR prod-
uct line. Linear float valve (Fig 50) and ball float valves (Fig. 51).
LEGEND
1 — Float Ball
2 — Refrigerant Exit
3 — Bearings
Fig. 51 — Economizer Float System (Two-Stage Compressor Chiller)
/ in. line that supplies re-
5
8
5 / in. flare
8
1
2
3
ECONOMIZER FLOAT SYSTEM (IF EQUIPPED)
For two-stage compressors, the economizer has a low side ball
type float system. The float refrigerant level can be observed
through the two sight glasses located on the float cover under the
condenser. See Fig. 51 for float detail. Inspect the float every five
years. Clean the chamber and the float valve assembly. Be sure
that the float moves freely and the ball bearings that the float
moves on are clean.
LEGEND
1 — Refrigerant Inlet from FLASC Chamber
2 — Linear Float Assembly
3 — Float Screen
4 — Bubbler Line
5 — Float Cover
6 — Bubbler Line Connection
7 — Refrigerant Outlet to Cooler
8 — Gasket
Fig. 50 — Linear Float Valve Design
50
1
2
7
8
3
4
5
6
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