1. Install all bolts finger tight.
2. Follow numbered sequence shown for head type being
installed. This will apply even pressure to the O-ring.
3. Apply torque in one-third steps until required torque is
reached. Load all bolts to each one-third step before pro-
ceeding to the next one-third step.
4. No less than one hour later, retighten all bolts to required
torque values.
5. Restore water/brine flow and check for leaks. Fix leaks
as necessary. Replace insulation (on cooler heads only).
Inspecting/Cleaning Heat Exchangers
COOLERS — Inspect and clean the cooler tubes at the end
of the first operating season. Because these tubes have in-
ternal ridges, a rotary-type tube cleaning system is neces-
sary to fully clean the tubes. Tube condition in the cooler
will determine the scheduled frequency for cleaning, and will
indicate whether water treatment is adequate in the chilled
water/brine circuit. Inspect the entering and leaving ther-
mistors for signs of corrosion or scale. Replace the sensor if
corroded or remove any scale if found.
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 re-
move 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 con-
denser refrigerant temperature against the leaving condenser
water temperature. If this reading is more than what the de-
sign 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. Con-
tact your Carrier representative to obtain these brushes. Do
not use wire brushes.
Hard scale may require chemical treatment for its pre-
vention or removal. Consult a water treatment specialist
for proper treatment procedures.
Water Treatment — Untreated or improperly treated
water may result in corrosion, scaling, erosion, or algae. The
services of a qualified water treatment specialist should be
obtained to develop and monitor a treatment program.
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, ero-
sion, and algae. Carrier assumes no responsibility for
chiller or condenser damage resulting from untreated or
improperly treated water.
Condenser Coils (30GX Only)
COIL CLEANING — Clean coils with a vacuum cleaner,
fresh water, compressed air, or a bristle brush (not wire). Units
installed in corrosive environments should have coil clean-
ing as part of a planned maintenance schedule. In this type
of application, all accumulations of dirt should be cleaned
off the coil.
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
BLANK PLATE
BLANK PLATES
9
5
2
4
7
11
12
8
1
3
6
10
Fig. 15 — Cooler and Condenser Head Recommended Bolt Torque Sequence
53
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