53
CONDENSERS (30HX Only) — Since this water circuit is
usually an open-type system, the tubes may be subject to
contamination and scale. Clean the condenser tubes with a
rotary tube cleaning system at regular intervals, and more often
if the water is contaminated. Inspect the entering and leaving
condenser water thermistors (if installed) for signs of corrosion
or scale. Replace the sensor if corroded or remove any scale if
found.
Higher than normal condenser pressures, together with in-
ability to reach full refrigeration load, usually indicate dirty
tubes or air in the machine. If the refrigeration log indicates a
rise above normal condenser pressures, check the condenser
refrigerant temperature against the leaving condenser water
temperature. If this reading is more than what the design
difference is supposed to be, then the condenser tubes may be
dirty, or water flow may be incorrect. Due to the pressure in the
R-134a system, air usually will not enter the machine; the
refrigerant will leak out.
During the tube cleaning process, use brushes specially
designed to avoid scraping and scratching the tube wall.
Contact your Carrier representative to obtain these brushes. Do
not use wire brushes.
Water Treatment —
Untreated or improperly treated wa-
ter may result in corrosion, scaling, erosion, or algae. The ser-
vices of a qualified water treatment specialist should be
ob-
tained to develop and monitor a treatment program.
Condenser Coils (30GXN,R only)
COIL CLEANING — For standard aluminum, copper and
pre-coated aluminum fin coils, clean the coils with a vacuum
cleaner, fresh water, compressed air, or a bristle brush (not
wire). Units installed in corrosive environments should have
coil cleaning as part of a planned maintenance schedule. In this
type of application, all accumulations of dirt should be cleaned
off the coil.
CLEANING E-COATED COILS — Follow the outlined pro-
cedure below for proper care, cleaning and maintenance of
E-coated aluminum or copper fin coils:
Coil Maintenance and Cleaning Recommendations — Rou-
tine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and
removal of harmful residues will greatly increase the life of the
coil and extend the life of the unit.
Hard scale may require chemical treatment for its preven-
tion or removal. Consult a water treatment specialist for
proper treatment procedures.
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.
Do not use high-pressure water or air to clean coils — fin
damage may result.
2
5
9
11
6
3
1
8
14
13
7
4
10
12
11
9
5
2
4
7
3
1
8
13
15
14
16
10
12
6
9
5
2
4
7
12
14
11
13
8
1
3
6
10
NOZZLE
NOZZLE
9
5
2
4
7
11
12
8
1
3
6
10
Fig. 25 — Cooler and Condenser Head Recommended Bolt Torque Sequence
