Carrier 42C,V Manual de instalación descargar pdf (Pagina 50)

debris into the unit valve packages. This will also allow

risers to be drained down after testing in the winter to

avoid freeze-up problems. In the event that leaking or de-

fective components are discovered, the sales representa-

tive must be notified BEFORE any repairs are attempted.

All leaks should be repaired before proceeding with the

unit installation.

13. After system integrity has been established, the riser insu-

lation must be pulled back into place over the joint and

glued or sealed to prevent sweating and heat loss or gain.

All of the risers including the riser stubouts should be

properly covered with insulation. Internally mounted

chilled water piping and valves are located over the drain

pan and need not be insulated.

Any fireproofing requirements where risers or piping pene-

trate floors or walls are the responsibility of the installer. This

work should be done only after all pressure testing is complet-

ed. The fireproofing method used must accommodate pipe ex-

pansion and contraction and the piping must be protected from

abrasion and chemical attack. The pipe insulation also must be

maintained to prevent sweating and must be protected from

wear or erosion at the joint between the insulation and the fire-

proofing material.

When no risers are ordered for the universal stack unit, it is

the responsibility of the installer to make sure that an isolation

ball valve is installed between each supply and return piping

connection to the unit. Flare fittings are factory provided to al-

low connection between the ball valves and the hoses.

Supply Air Installation

— Each side of the unit has one sup-

ply air knockout as well as a supply air knockout on the top of

the unit (see Fig. 45).

1. Determine which supply air opening/openings are re-

quired for your application.

NOTE: The supply air opening on the riser side of the

unit should not be used.

2. Use a sharp retractable knife to trim insulation using cen-

ter knockout slot/trim line as pattern (see Fig. 54).

3. Use a sharp standard needle nose pliers and grab knock-

out tab (see Fig. 54).

4. Twist or pry pliers back and forth until knockout tab

breaks away from unit.

5. Repeat for all supply air tabs until all have been broken.

6. Discard center knockout piece. Be careful of sharp edges.

7. Use a sharp retractable knife to trim any excess insulation

using knockout hole as pattern.

8. Use duct pliers (hand seamers) to fold duct flange out of

the unit 90 degrees for each side of the supply air opening

along duct break (see Fig. 54). The 90-degree flanges can

now be used as drywall stops to prevent coverage of dis-

charge opening (see Fig. 55).

9. Use adhesive or glue to re-attach insulation that has

pulled away from the unit during knockout removal

process.

10. For ducted applications tape should be applied along and

around all of the supply air opening knockouts to prevent

air leakage.

All installations should be made in compliance with all gov-

erning codes and ordinances. Compliance with all codes is the

responsibility of the installing contractor.

42 SM Units

— The unique design of the mega stack fan coil

unit allows for field configuration of each unit. Risers, shown

with unit, are for reference only. All risers are factory fabricat-

ed and shipped loose for field installation.

It is important that you identify all of the unit feature loca-

tions before proceeding with the installation, see Fig. 36. Also,

it must be determined whether your application requires a mat-

ing unit (primary/secondary) and its configurations. Consult

your local sales representative or the factory for further details

on primary/secondary arrangements.

Unit orientation is determined based on the location of the

risers in the building. Risers can only be installed on the rear

side of the unit and always determine the rear of the mega stack

unit. The return air is always on the front (see Fig. 56).

Supply, Return, and Drain Risers

KNOCKOUT TAB

10 PLACES

DUCT BREAK

4 PLACES

KNOCKOUT TAB

TRIM LINE

a42-4291

Fig. 54 — 42SU Unit Supply Air Installation

CAUTION

Toxic residues and loose particles resulting from manufac-

turing and field piping techniques such as joint compounds,

soldering flux, and metal shavings may be present in the

unit and the piping system. Special consideration must be

given to system cleanliness when connecting to solar,

domestic or potable water systems.

UNIT

WALL

UNIT

INSULATION

90°

DUCT FLANGE

Fig. 55 — 42SU Supply Air Installation

a42-4293

RETURN AIR

42SM

CABINET

HR CRDHS CS

HR = HOT WATER RETURN

HS = HOT WATER SUPPLY

D = DRAIN

CR = COLD WATER RETURN

CS = COLD WATER SUPPLY

R = RETURN

D = DRAIN

S = SUPPLY

2 or 4PIPE

RIGHTLEFT

REAR

FRONT

Fig. 56 — 42SM Unit Installation

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1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 87 88

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