Condenser Coils; Condenser Fans - Carrier 30GTN Service And Troubleshooting Manual

Tightening Cooler Head Bolts
Gasket Preparation — When reassembling cooler heads, al-
ways use new gaskets. Gaskets are neoprene-based and are
brushed with a light film of compressor oil. Do not soak gas-
ket or gasket deterioration will result. Use new gaskets within
30 minutes to prevent deterioration. Reassemble cooler nozzle
end or plain end cover of the cooler with the gaskets. Torque
all cooler bolts to the following specification and sequence:
5 ⁄ -in. Diameter Perimeter Bolts . . . . . . 150 to 170 ft-lb
8
1 ⁄ -in. Diameter Flange Bolts . . . . . . . . . . 70 to 90 ft-lb
2
1. Install all bolts finger tight.
2. Bolt tightening sequence is outlined in Fig. 25. Follow
the numbering or lettering sequence so that pressure is
evenly applied to gasket.
3. Apply torque in one-third steps until required torque is
reached. Load all bolts to each one-third step before pro-
ceeding to next one-third step.
4. No less than one hour later, retighten all bolts to required
torque values.
5. After refrigerant is restored to system, check for refrig-
erant leaks with soap solution or Halide device.
6. Replace cooler insulation.

Condenser Coils

COIL CLEANING — Clean coils with a vacuum cleaner,
fresh water, compressed air, or a bristle brush (not wire). Units
SIZES 080,090* WITH 14-BOLT HEADS
SIZES 130,150*
*And associated modular units.
Fig. 25 — Cooler Head Bolt Tightening Sequence (Typical Tube Sheet)
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.
(201 to 228 N-m)
Condenser Fans —
wire mount bolted to fan deck and covered with a wire guard.
The exposed end of fan motor shaft is protected from weather
(94 to 121 N-m)
by grease. If fan motor must be removed for service or
replacement, be sure to regrease fan shaft and reinstall fan
guard. For proper performance, fan should be positioned as
in Fig. 26A and 26B (standard and low-noise applications).
Tighten setscrews to 15
fan must be set from the top of the fan deck to the plastic
ring or center of the fan to a distance of 2.13 in.
(54
is no area available to measure from the top of the orifice
ring to the fan hub itself. See Fig. 27.
SIZES 100,110* WITH 22-BOLT HEADS
SIZES 170,190*
55
Do not use high-pressure water or air to clean coils —
fin damage may result.
Each fan is supported by a formed
1 ft-lb (20
If the unit is equipped with the high-static fan option, the
3 mm). This is different from standard fans, since there
IMPORTANT: Check for proper fan rotation (clock-
wise viewed from above). If necessary, switch any 2
power leads to reverse fan rotation.
SIZES 080,090* WITH 18-BOLT HEADS
SIZES 100,110* WITH 16-BOLT HEADS
1.3 N-m).
0.12 in.
SIZE 210*