Carrier 42C,V Manual de instalación descargar pdf (Pagina 51)

Submittals and product literature detailing unit operation,

controls, and connections should be thoroughly reviewed BE-

FORE beginning the connection and testing of risers and

piping.

The supply and return connections are marked on the coil

stubouts and the valve package depending on your configura-

tion. “CS” means cold water supply, “CR” means cold water

return, “HS” means hot water supply, and “HR” means hot wa-

ter return to indicate flow direction to and from the coil. Blue

letters mark the chilled water connections and red letters mark

the hot water connections.

The unit internal piping is designed to accommodate a total

riser vertical movement of ±1

in., due to thermal expansion

and/or contraction, when positioned properly at the jobsite.

Risers must be anchored to the building structure to limit riser

expansion and contraction movement to a maximum of 3 inch-

es. Riser anchoring and expansion compensation is not includ-

ed in the factory-supplied unit and must be field provided.

While some special riser features are available from the factory,

riser end caps, air vents, and/or flushing loops are normally

provided on the job by the installer.

Riser to Unit Installation

— Proper riser installation and verti-

cal positioning in the unit provides for a unit piping run-out to

the service valves which are centered in the access slots and

level or sloping down slightly away from the riser. This pre-

vents condensation from running back to the riser and possible

damage from dripping at the bottom of a riser column. Each

job has specific requirements and satisfying those requirements

is the responsibility of the installer.

Riser to Drain Installation

1. Carefully position the unit so that the riser ball valves

penetrate into the unit through the riser slot making sure

the insulation penetrates into the unit as shown in Fig. 57

and 58.

2. Before anchoring the equipment in place, the unit must be

leveled and the cabinet must be plumb and squared. The

unit may be anchored in place by bolting directly through

the unit’s floor or attaching to the building walls through

the cabinet walls in some location that will not interfere

with drywall or other items such as the supply grille, ther-

mostat, or return access panel. When attaching sheetrock

to the unit cabinet, care must be taken to not penetrate the

cabinet in locations that may damage internal compo-

nents or wiring. The mounting technique is a matter of

choice; however, the unit should always be anchored se-

curely to the building to prevent movement during con-

struction and riser expansion and contraction. After an-

choring the unit, it is then ready for the various service

connections such as riser connections and electrical.

3. The plastic flare caps on the end of the riser ball valves

should be removed and discarded.

4. All mega stack units use reinforced braided stainless steel

flexible hose kits for piping between field installed risers

and unit water coils as shown in Fig. 58. Each hose has

threaded connections on each end. The hose kits allow for

riser fluctuations due to thermal expansion.

5. Use a wrench to tighten the swivel connections. Use a

backup wrench to hold the riser ball valve stationary to

prevent it from bending or twisting during installation as

shown in Fig. 59. Be careful to not over tighten swivel

connections.

6. Locate the unit’s coil fitting.

7. The plastic flare caps on the end of the coil fitting should

be removed and discarded.

8. Use a wrench to tighten the swivel connections. The baf-

fle acts as a secondary wrench. Be careful to not over

tighten swivel connections.

9. Locate the p-trap drain and rubber hose factory installed

to the drain pan connection in the bottom of the unit as

shown in Fig. 60.

10. Push the rubber drain hose over the riser drain stubout. Be

careful that you do not bend the drain stubout.

11. Adjust the hose clamp over the riser stubout and rubber

hose to hold in place as shown in Fig. 60.

BALL

VALVE

RISER STUBOUT

INSULATION

THREADED

FLARE FITTING

FLARE CAP

UNIT INSULATION

OUTER

CABINET

RISER KNOCKOUT

SLOT

Fig. 57 — 42SM Riser to Unit Installation

a42-4295

FLEXIBLE

HOSE KIT

RISER

BALL

VALVE

RISER STUBOUT

INSULATION

CONNECTION POINT TO ANY FACTORY

FURNISHED AND INSTALLED

COMPONENTS.

COIL

BAFFLE

Fig. 58 — 42SM Riser to Unit Connection

a42-4296

CAUTION

Hose connection torque requirements are 350 in. lb +10/

–0 in. lb to prevent leaks.

CAUTION

Hose connection torque requirements are 350 in. lb +10/

–0 in. lb to prevent leaks.

BACKUP

WRENCH

BALL

VALVE

WRENCH

SWIVEL

CONNECTION

a42-4297

Fig. 59 — 42SM Riser to Unit Installation

(Tighten Swivel Connections)

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 87 88

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