Carrier 19FA Istruzioni per gli Interventi Scaricare il pdf (Pagina 35)

HVAC Training

Page : 35 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

3) A micron is defined as the thousandth part of one-millimeter (.001 millimeter).

a) The screen is 18 x 16 mesh aluminum with a wire diameter of .011”.

b) The support tube is 3/16” expanded aluminum with both ends molded into epoxy and the cap.

c) The felt washers are made of 100% white wool or dacron felt.

d) The dual media used for cartridge allows the larger particles to be removed in the 20 micron mesh portion and

the smaller particles in the 5 micron mesh portion. This design gives better efficiency of the filter.

e) Observe oil and filter for contaminants and F.M.F note findings to system engineering for further analysis.

4) New filter cartridges packages come with gaskets, O-rings and felt washers. This allows the filters to be installed

on various machines. Extra felt washers are provided to compensate for different length housings.

a) We have not had to use the extra felt washers at this point. If the additional felt washer is required it should be

installed at the bottom of the filter body, the alignment guide will hold it in place. You should experience the

spring loading when installing the filter canister.

b) Two O-rings are included in the package.

i) The plain O-ring is used for high pressure refrigerants such as R-12, R-22, R-500, and R-134A.

ii) The O-ring with the orange dot is used for low pressure applications using R-11 or R-123.

iii) For this application, R-134A, use the O-ring without the orange dot.

i v) Always use a lubricant on new O-ring we’ve been using Dow Corning 55 O-ring lubricant on all of our O-

rings, new refrigerant oil is also acceptable.

5) When reinstalling filter housing be careful to not over tighten filter nut, snug fit is all that is required.

Recall the Lesson learned from enabling objective one, good work practices:

CRDR#110846 Oil leak on the essential chiller at the oil cooler inlet caused by excessive torque

applied to the elbow during CM work.

Use this time to emphasize good work practices when torquing oil connections.

CRDR# 2934843 Essential chiller trip due to restricted oil flow caused by the woven felt gaskets at

the top and bottom of each filter.

Use this time to emphasize good work practices when installing the filter canister.

De mo

Caution: De-energize the oil sump heater prior to removing the oil from the sump.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 41 42

Nessun commento

Carrier 19FA Istruzioni per gli Interventi Pagina 35