Water Treatment; Oil Charge; Check Refrigerant Feed Components; Moisture-Liquid Indicator - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

4. Remove the four nuts holding the heat exchanger to the
brackets. Save the nuts.
5. Install the replacement heat exchanger in the unit and at-
tach to the bracket using the four nuts removed in Step 4.
For sizes 015 and 020, torque is 7 to 10 ft-lb. For sizes
030-045, torque is 35 to 50 ft-lb. For sizes 050-071,
torque is 10 to 11 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
repaired.
7. For coolers, ensure that the original size tubing is used
( 1 / in. for sizes 015 and 020,
2
1 / in. for sizes 050-071) between the TXV/EXV or ex-
3
8
pansion device and the cooler. The TXV/EXV or expan-
sion device must be located within 1 ft of the heat ex-
changer, with no bends between the TXV/EXV or expan-
sion device outlet and the cooler inlet.
8. Reconnect the water/brine lines.
9. Dehydrate and recharge the unit. Check for leaks.
BRAZED-PLATE COOLER AND CONDENSER HEAT
EXCHANGER CLEANING — Brazed-plate heat exchang-
ers must be cleaned chemically. A professional cleaning ser-
vice skilled in chemical cleaning should be used. Use a weak
acid (5% phosphoric 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 strainers in front of the water/brine inlets of the heat ex-
changers should be cleaned periodically, depending on
condition of the chiller water/brine.
Untreated or improperly treated
Water Treatment —
water may result in corrosion, scaling, erosion, or algae. The
services of a qualified water treatment specialist should be ob-
tained to develop and monitor a treatment program. See water
system cleaning section for water quality characteristics and
limitations in the unit installation instructions.
CAUTION
Water must be within design flow limits, clean and treated
to ensure proper machine performance and reduce the
potential of tubing damage due to corrosion, scaling,
erosion, and algae. Carrier assumes no responsibility for
chiller or condenser damage resulting from untreated or
improperly treated water.

Oil Charge

CAUTION
The compressor in a Puron
uses a polyol ester (POE) oil or poly vinyl ester (PVE) oil.
This is extremely hygroscopic, meaning it absorbs water
readily. Take all necessary precautions 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 for
30MP015-045 units. The 30MP050-071 units use polyvinyl
ester (PVE) oil. See Table 43.
5 / in. for sizes 030-045, and
8
® refrigerant (R-410A) system
Table 43 — Compressor Oils
30MP UNIT SIZE
015-045
050-071
Use only Carrier approved compressor oil. Oil should be
visible in compressor oil sight glass. An acceptable oil level is
from 1 / to 3 / of sight glass. All compressors must be off when
8 8
checking oil level. Recommended oil level adjustment method
is as follows:
ADD OIL — Additional oil may be required in 30MPA units.
Tables 37 and 38 provide an estimate of the amount of oil re-
quired, based on the line length and the recommended pipe siz-
es. The actual circuit oil charge will depend on the application
piping. The guidelines listed are estimates and will likely need
adjusting depending on the number of traps in the application
and the pipe sizes utilized.
No attempt should be made to increase the oil level in the
sight-glass above the 3
tainable in the compressor and the extra oil will be pumped out
into the system causing a reduction in system efficiency and a
higher-than-normal oil circulation rate.
Add oil to suction line Schrader valve on tandem compres-
sors sets and the compressor Schrader on the trios. When oil
can be seen at the bottom of the sight glass, add oil in 5 oz in-
crements which is approximately
pressors for 20 minutes then shut off to check oil level. Repeat
procedure until acceptable oil level is present.
NOTE: Use only Carrier approved compressor oil. Approved
sources for 30MP015-045 units are:
Totaline . . . . . . . . . . . . . . . . . . . . . . 3MAF POE, P903-1601
Mobil. . . . . . . . . . . . . . . . . . . . . . . . . . . EAL Arctic 32-3MA
Uniqema . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RL32-3MAF
The approved source for 30MP050-071 units is:
Totaline . . . . . . . . . . . . . . . . . . . . . . . . FVC32D, P903-2501
Do not reuse oil that has been drained out, or oil that has
been exposed to atmosphere.

Check Refrigerant Feed Components

FILTER DRIER — The function of the filter drier is to main-
tain a clean, dry system. The moisture indicator (described
below) indicates any need to change the filter drier. The filter
drier is a sealed-type drier for 30MP015-045 and removeable
core for 30MP050-071. When the drier needs to be changed,
the entire filter drier must be replaced for 30MP015-045 units.
MOISTURE-LIQUID INDICATOR — The
located immediately ahead of the TXV to provide an indication
of the refrigerant moisture content. It also provides a sight glass
for refrigerant liquid. Clear flow of liquid refrigerant (at full unit
loading) indicates sufficient charge in the system. Bubbles in the
sight glass (at full unit loading) indicate an undercharged system
or the presence of noncondensables. Moisture in the system,
measured in parts per million (ppm), changes the color of the
indicator as follows:
Green (safe) —Moisture is below 75 ppm
Yellow-Green (caution) — 75 to 150 ppm
Yellow (wet) — above 150 ppm
The unit must be in operation at least 12 hours before the
moisture indicator gives an accurate reading, and must be in
contact with liquid refrigerant. At the first sign of moisture in
the system, change the corresponding filter drier.
THERMOSTATIC
(30MP015-045 ONLY) — The TXV controls the flow of
liquid refrigerant to the cooler by maintaining constant super-
heat of vapor leaving the cooler. The valve is activated by a
temperature-sensing bulb strapped to the suction line.
45
OIL
POE 3MAF
PVE FVC32D
/ full level. A high oil level is not sus-
4
/ in oil level. Run all com-
1
8
indicator
EXPANSION VALVE
is
(TXV)