Carrier 42C,V Manual de instalación descargar pdf (Pagina 52)

12. Test for leaks. Any and all leaks should be repaired before

proceeding with installation. When testing with air or

some other gas, it might be necessary to tighten stem

packing nuts on some valves to maintain air pressure in

the riser. Pressure testing risers with water should be done

with the unit service valves closed to prevent flushing de-

bris into the unit valve packages. These valves will also

allow risers to be drained down after testing in the winter

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

defective components are discovered, the sales represen-

tative must be notified BEFORE any repairs are attempt-

ed. 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

penetrate floors or walls are the responsibility of the in-

staller. This work should be done only after all pressure

testing is completed. The fireproofing method used must

accommodate pipe expansion and contraction and the

piping must be protected from abrasion and chemical at-

tack. The pipe insulation also must be maintained to pre-

vent sweating and must be protected from wear or ero-

sion at the joint between the insulation and the fireproof-

ing material.

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

the responsibility of the installer to make sure that a field-

supplied isolation ball valve is installed between each

supply and return piping connection to the unit. Flare

fittings are factory provided to allow connection between

the ball valves and the hoses.

Variations in floor-to-floor dimensions may require field

work such as cutting off or extending the risers. This op-

eration is the responsibility of the installer. The riser joint

filler material must be selected to withstand the total op-

erating pressure (both static and pumping head) to which

the system will be subjected. Low temperature lead alloy

solders such as “50/50” and “60/40” are normally not

suitable.

Chilled water and hot water risers should never be piped

to drain down into the condensate riser. Extensive water

damage can occur due to drain overflow. Drain chilled

and hot water risers to a remote location away from the

unit such as sink, room, or floor drains.

All installations should be made in compliance with all

governing codes and ordinances. Compliance with all

codes is the responsibility of the installing contractor.

Supply Air Installation

1. If the unit has been ordered with a supply air plenum,

then each side of the unit has one supply air knockout as

well as a supply air knockout on the top of the unit (see

Fig. 61 and 62).

2. 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.

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

ter knockout slot/trim line as pattern (see Fig. 63).

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

out tab (see Fig. 63).

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

breaks away from unit.

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

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

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

using knockout hole as pattern.

9. 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. 63). The 90-degree flanges can

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

charge opening (see Fig. 64).

DRAIN PAN

DRAIN

CLAMP

RISER KNOCKOUT

UNIT INSULATION

PTRAP

UNIT WALL

RISER

RISER STUBOUT

a42-4298

Fig. 60 — 42SM Riser to Drain Installation

SIDE SUPPLY AIR

KNOCKOUT

1 PER SIDE

SIDE VIEW

MEGA MOD

CABINET

OPTIONAL

SUPPLY

PLENUM

a42-4299

Fig. 61 — 42SM Unit Knockout Locations

Side View (Typical)

TOP SUPPLY

AIR KNOCKOU

TOP VIEW

ELECTRICAL

KNOCKOUTS

Fig. 62 — 42SM Unit Knockout Locations

Top View (Typical)

a42-4300

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 87 88

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