Valve Package Installation; (When Applicable) - Carrier 42C Series Installation Instructions Manual

Drain Pan
Drain
Clamp
2" Minimum
"P" Trap
Fig. 77 — "P" Trap Minimum Configuration
VALVE PACKAGE INSTALLATION 

(WHEN APPLICABLE)

NOTE: Always protect chilled and hot water valve bodies,
strainers, ball valves, and other flow control related devices from
heat caused by soldering or brazing processes by wrapping these
devices in cold or damp rags.
NOTE: Zone valves recommended to prevent excessive
condensate (from running wild coil).
All accessory valve packages should be installed as required, and
all service valves should be checked for proper operation.
If coil and valve package connections are to be made with a
"sweat" or solder joint, care should be taken to assure that no
components in the valve package are subjected to a high tempera-
ture which may damage seals or other materials. Many two-posi-
tion electric control valves, depending on valve operation, are
provided with a manual opening lever. This lever should be
placed in the "open" position during all soldering or brazing
operations.
Ground-Joint seal preparation for copper unions (recommended
by manufacturer):
1. Make sure the ground-joint area is free of nicks and scratches.
2. Spray the ground-joint area with silicone spray for beeswax
to enhance seating.
3. Recommended torques for ground-joint seal:
1/2 in. (12.7 mm) (nominal) unions – 35 ft/lb
(23, 519 mm/kg) (minimum)
3/4 in. (19 mm) (nominal) unions – 60 ft/lb
(40,318 mm/kg) (minimum)
4. Make sure alignment of line does not put lateral stress on the
ground-joint seal.
5. Make sure that excess solder droplets do not reach the
ground-joint area.
If the valve package connection at the coil is made with a union,
the coil side of the union must be prevented from twisting
("backed up") during tightening to prevent damage to the coil tub-
ing. Over-tightening must be avoided to prevent distorting ("egg
shaping") the union seal surface and destroying the union.
The supply and return connections are marked on the coil stub-
outs and the valve package, with an "S" meaning supply or inlet
and "R" meaning return or outlet indicating flow direction to and
from the coil. Blue letters mark the chilled water connections and
red letters mark the hot water or steam connections.
In the case of field-installed valves and piping, the chilled water
valve cluster (or expansion valve on DX units) should be installed
in such a way that any dripping or sweating is contained in the
drain pan or other device such as an optional extended drain pan or
factory drip lip. Factory drip lips are field installed and may be
packaged separately from the unit.
Factory supplied cooling coil valve packages will be arranged to
locate as much of the package as possible over a standard drip lip.
Unit
NOTE: Field trim
Wall
"P" trap as required
to prevent kinking.
Drain
Clamp
General Assembly
1. For 42CG and 42CK units, factory provides tube extensions
to penetrate the rear of the fan coil cabinet. Chilled and hot
extension tubes must be properly insulated. See Fig. 78.
2. Remove valve actuators temporarily during valve installation.
Protect unit wiring from damage.
3. Install valve packages and connect to the coil in sequence,
first heating, then cooling.
4. Torque unions tight using backup wrench to prevent damage
to coil tubes. Align exiting tubes to the center of the pipe
openings.
5. If desired, apply split bushings or grommets (provided by
others) to the pipes for mechanical support and protection. Do
not allow copper tube to contact steel cabinet.
6. Now is a good time to leak test the unions and fittings, using
air pressure and soap. The coil air vent(s) may be used for this
purpose.
Fig. 78 — General Valve Package Assembly
(CG Unit Shown)
If none of the above factory accessories have been provided with
the units, a drip lip (available from the factory) may still be re-
quired to direct piping condensate into the unit drain pan.
After the connections are completed, the system should then be
tested for leaks. Since some components are not designed to hold
pressure with a gas, hydronic systems should be tested with water.
Pressure testing should be completed prior to sheet rocking or
painting.
Refrigerant systems should be tested with dry nitrogen rather than
air to prevent the introduction of moisture into the system. In the
event that leaking or defective components are discovered, the
Sales Representative must be notified BEFORE any repairs are
attempted. All leaks should be repaired before proceeding with the
installation.
After system integrity has been established, insulate the piping in
accordance with the project specifications. This is the responsibili-
ty of the installing or insulation contractor. All chilled water piping
and valves or refrigerant suction piping not located over drain
pans or drip lips must be insulated to prevent damage from sweat-
ing. This includes factory and field piping inside the unit cabinet.
All water coils must be protected from freezing after initial
filling with water. Even if the system is drained, unit coils may
still hold enough water to cause damage when exposed to tem-
peratures below freezing.
DO NOT OVERTIGHTEN! Over-tightening will distort (egg
shape) the union seal surface and destroy the union
70
CAUTION
CAUTION