Compressor Replacement; Cooler; Brazed-Plate Cooler Heat Exchanger; Oil Charge - Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

Compressor Replacement (Fig. 34-36) —
models contain scroll compressors and have from one to six
compressors. The size 010-030 units are a single refrigeration
circuit while sizes 035-150 are dual circuit. A compressor is
most easily removed from the front of the unit, depending on
where clearance space was allowed during unit installation.
Remove the junction box cover bolts and disconnect the
compressor power and ground connections. Remove the cable
from the compressor junction box. Remove the connections
from the high-pressure switch. Knock the same holes out of the
new compressor junction box and install the cable connectors
from the old compressor.
The compressors are bolted to rails, which are in turn bolted
to the unit basepan for all sizes except 010 and 015 which are
directly bolted to the basepan. Remove the 4 bolts holding the
compressor to the rail on the basepan. Save the mounting hard-
ware for use with the new compressor. Carefully cut the com-
pressor suction and discharge lines with a tubing cutter as close
to the compressor as feasible. Remove high-pressure switch
and pressure transducer(s) if required for compressor removal.
Lift one corner of the compressor at a time and remove all the
rubber mounting grommets (single compressor circuits) or
steel spacers (dual compressor circuits). Remove the old com-
pressor from the unit.
Slide the new compressor in place on the basepan. Lifting
one side of the compressor at a time, replace all of the compres-
sor mounting grommets. Using new tubing as required, recon-
nect compressor suction and discharge lines. Using hardware
saved, reinstall the mounting bolts and washers through the
compressor feet. Using proper techniques, braze suction and
discharge lines and check for leaks. Reconnect oil equalization
line on dual compressor circuit models.
Reconnect the compressor power connections and high-
pressure switch wiring as on the old compressor. Refer to
Fig. 34-36. Following the installation of the new compressor,
tighten all hardware to the following specifications. (See
Table 23.)
Table 23 — Unit Torque Specification
FASTENER
Compressor Mounting
Bolts
Compressor Power
Connections
Compressor Ground
Terminal Connections

Cooler

BRAZED-PLATE COOLER HEAT EXCHANGER RE-
PLACEMENT — Brazed-plate heat exchangers cannot be
repaired if they develop a leak. If a leak (refrigerant or water)
develops, the heat exchanger must be replaced. To replace a
brazed-plate heat exchanger:
1. Check that the replacement heat exchanger is the same as
the original heat exchanger. The unit insulation covers the
manufacturer's part number. Make sure the depths of the
replacement and original cooler heat exchangers are the
same.
2. Disconnect the liquid-in and liquid-out connections at the
heat exchanger.
3. Recover the refrigerant from the system, and unsolder the
refrigerant-in and refrigerant-out connections.
4. Remove the old heat exchanger. The replacement heat ex-
changer is supplied fully insulated. It also includes a cool-
er heater. Use of the heater is not required unless the orig-
inal cooler contained a factory-installed heater.
5. Install the replacement heat exchanger in the unit and at-
tach the mounting bracket hardware to the fan uprights
RECOMMENDED TORQUE
7 to 10 ft-lb (9.5 to 13.5 N-m)
24 to 28 in.-lb (2.7- to 3.2 N-m)
14 to 18 in.-lb (1.6 to 2.0 N-m)
(sizes 010-030) or to the bottom bracket (sizes 035-150)
All
using the hardware removed in Step 4. Reconnect the
cooler heater if required. For sizes 010-025, torque the
bolts to 7-10 ft-lb. For sizes 030-150, torque the bolts to
30-50 ft-lb.
6. Carefully braze the refrigerant lines to the connections on
the heat exchanger. Lines should be soldered using silver
as the soldering material with a minimum of 45% silver.
Keep the temperature below 1472 F (800 C) under nor-
mal soldering conditions (no vacuum) to prevent the cop-
per solder of the brazed plate heat exchanger from chang-
ing its structure. Failure to do so can result in internal or
external leakage at the connections which cannot be re-
paired. Braze the liquid lines with a heat sink around the
expansion valve to protect it from excess heat.
7. Reconnect the water/brine lines.
8. Dehydrate and recharge the unit. Check for leaks.
BRAZED-PLATE
CLEANING — Brazed-plate heat exchangers must be
cleaned chemically. A professional cleaning service skilled in
chemical cleaning should be used. Use a weak acid (5% phos-
phoric acid, or if the heat exchanger is cleaned frequently, 5%
oxalic acid). Pump the cleaning solution through the
exchanger, preferably in a backflush mode. After cleaning,
rinse with large amounts of fresh water to dispose of all the
acid. Cleaning materials must be disposed of properly.
The factory-installed strainer screen in front of the water/
brine inlets of the heat exchangers should be cleaned periodi-
cally, depending on condition of the chiller water/brine.

Oil Charge

The compressor in a Puron
uses a polyol ester (POE) oil. This is extremely hygro-
scopic, meaning it absorbs water readily. POE oils can
absorb 15 times as much water as other oils designed for
HCFC and CFC refrigerants. Take all necessary precau-
tions to avoid exposure of the oil to the atmosphere. Failure
to do so could result in possible equipment damage.
Puron refrigerant systems use a polyol ester (POE) oil. Use
only Carrier-approved compressor oil. Oil should be visible in
compressor oil sight glass. An acceptable oil level is from
3 / of sight glass for unit size 010-090, and
8
glass for unit size 100-150. All compressors must be off when
checking oil level. Recommended oil level adjustment method
is as follows:
ADD OIL — Recover charge from the unit. Add oil to suction
line Schrader valve on tandem compressors sets and the com-
pressor Schrader on the three-compressor circuits and single-
compressor circuits. (See Fig. 34-36.) When oil can be seen at
the bottom of the sight glass, add oil in 5 oz increments which
is approximately
minutes then shut off to check oil level. Repeat procedure until
acceptable oil level is present.
NOTE: Use only Carrier-approved compressor oil.
• Oil Type. . . . . . . . . . . . . . . . Inhibited polyol ester-based
• ISO Viscosity Grade . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Approved sources are:
UNIT SIZES 010-090
MANUFACTURER
Totaline . . . . . . . . . . . . . . . . . . . . . . 3MAF POE, P903-1601
Mobil . . . . . . . . . . . . . . . . . . . . . . . . . . .EAL Arctic 32-3MA
Uniqema . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RL32-3MAF
50
COOLER HEAT
CAUTION
® refrigerant (R-410A) system
3
1 / in oil level. Run all compressors for 20
8
synthetic compressor lubricant.
EXCHANGER
1 / to
8
/ to 7 / of sight
4 8
OIL