Carrier 42C,V Manual de instalación descargar pdf (Pagina 60)

42C,D,V WATER SUPPLY/RETURN CONNECTIONS —

Install piping in accordance with all applicable codes. Position

valves over the drain pan. Be sure valves are in proper operat-

ing position and are easily accessible for adjustment. See

Fig. 69-72. Refer to Fig. 75 for copper water tube and joint

material pressure ratings.

If coil and valve package connections will be made with a

solder joint, care should be taken to ensure that the components

in the valve package are not subjected to high temperatures,

which may damage seals or other materials. Protect all valve

accessories with wet or damp rag wrapped around the body

during soldering / brazing process. See Fig. 76. Many 2-posi-

tion electric control valves are provided with a manual operat-

ing lever. This lever should be in the OPEN position during all

soldering operations.

If coil connection is made with a union, the coil side of the

union must be prevented from turning (it must be backed up)

during tightening. See Fig. 69-72 for common valve packages.

The supply and return connections are marked and color

coded on the coil stub out and valve package. Supply side is

marked as 'S' and return side is marked as 'R.' A blue letter indi-

cates cooling side and a red letter indicates heating side. In case

of field-installed valves and piping, install chilled water valve

components in a way that any condensate dripping or sweating

caused is contained in the extended drain pan or auxiliary drain

or drip lip (optional). Optional drip lip is field installed and

may be packaged separately from the unit.

NOTE: The project specifications for system pressure, pres-

sure drop limitations, and flow rate should be checked prior to

selection of specific components or the valve package size.

42C,D,V STEAM CONNECTIONS — On units with steam

heating coils, the maximum steam pressure applied to the unit

should never exceed 10 psig. However, when steam is used on

a 4-pipe application system with 1-row and 2-row coils the

maximum steam pressure should never exceed 5 psig (suitable

for only low pressure steam).

Do not drain the steam mains or take-off through the coils.

Drain the mains ahead of the coils through a steam trap to the

return line. Overhead returns require 1 psig of pressure at the

steam trap discharge for each 2 ft elevation to ensure continu-

ous condensate removal.

Proper steam trap selection and installation is necessary. As

a guideline in creating a steam trap locate the steam trap dis-

charge at least 12 in. below the condensate return connection.

This provides sufficient hydrostatic head pressure to overcome

trap losses and ensure complete condensate removal.

42C,D,V DIRECT EXPANSION (DX) REFRIGERANT

PIPING — Use the condensing unit manufacturer's recom-

mended line sizes and requirements. Suction line must be

insulated for correct operation. Use refrigerant-grade copper

lines only. The unit is not applied as a heat pump.

Thermostatic expansion valve (TXV) and sensing bulb are

factory-installed on units when DX coil option is chosen with

distributor and TXV.

NOTE: If a hot water coil is used in the reheat position, a field-

supplied freezestat must be installed to protect the coil.

TEST AND INSULATE — When all joints are complete,

perform hydrostatic test for leaks. Vent all coils at this time.

Check interior unit piping for signs of leakage from shipping

damage or mishandling. If leaks are found, notify your Carrier

representative before initiating any repairs. Release trapped air

from system (refer to Step 7 — Make Final Preparations

section).

Never pressurize any equipment beyond specific test pres-

sure. Always pressure test with an inert fluid or gas, such as

clear water or dry nitrogen to avoid possible damage or injury

in the event of a leak or component failure during testing.

Following the hydrostatic test, insulate all piping to prevent

sweating.

To ensure compliance with building codes, restore the struc-

ture's original fire resistance rating by sealing all holes with

material carrying the same fire rating as the structure.

CAUTION

DO NOT OVERTIGHTEN! Overtightening will distort

(egg shape) the union seal surface and destroy the union.

Drain Pan

Drain

“P” Trap

Clamp

Unit

Wall

NOTE: Field trim

“P” trap as required

to prevent kinking.

Drain

Clamp

2" Minimum

Fig. 74 — “P” Trap Minimum Configuration

CAUTION

All water coils must be protected from freezing after initial

filling with water. Even if system is drained, unit coils may

still have enough water to cause damage when exposed to

temperatures below freezing.

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