Carrier 50LJ User Manual download pdf (Page 14)

BAROMETRIC RELIEF/POWER EXHAUST HOOD -

The same hood is used for barometric relief and power

exhaust, and is shipped separately from the base unit, in

cartons marked 50DJ900371.

Barometric relief can only be unit mounted on vertical

supply/return units (48/50LJ). It may be duct mounted on

horizontal supply/retum units (50LW).

Power exhaust can only be unit mounted on vertical supply/

return units 48/50LJ. Accessory power exhaust may be duct

mounted on horizontal supply/retum unit 50LW.

IMPORTANT: If using power exhaust, the return duct

must have a 90 degree elbow below the unit to com

ply with ANSI codes.

Cartons contain:

1 preassembled hood/damper assembly

1 fastener package (taped to inside of hood)

The fastener package contains:

6 screws, '/4 AB X %-in. long

2 seal strips 36-in. long x 1-in. wide x Vs-in. thick with

pressure-sensitive adhesive on one side.

2 seal strips, 33-in. long x 1-in. wide x Vs-in. thick with

pressure-sensitive adhesive on one side.

1. Remove the lag screws holding hood assembly to ship

ping skid. See Fig. 12.

2. Before installing the hood on the unit, remove the chan

nel panel attached to the barometric relief/power ex

haust fan deck and the panel to the left.

3. Remove the middle 2 screws holding the fan deck to

the base rail.

4. Apply the 36-in. long seal strips to the side flanges of

the hood assembly.

5. Apply the 33-in. long seal strips to the top and bottom

flanges of the hood assembly.

COMPRESSOR

ACCESS

PANEL

6. Trim the excess seal strip as needed.

7. Make seal strips flush with the outer edges of the flanges.

8. Use a punch to punch out holes for the screws.

A CAUTION

Hood assembly is heavy. At least 2 men should

handle it.

10.

II.

12.

HOOD

Fig. 12 — Power Exhaust/Barometric Relief Hood

(50LJ Unit Shown)

Line up the top flange of the hood assembly with the 6

holes in the fan deck (approximately 6V2 in. from the

top.)

Using the 6 screws from the fastener package, secure

the top flange of the hood assembly to the fan deck.

Reinstall the 2 screws attaching the fan deck to the base

rail. (The holes in the bottom flange of the hood

assembly should line up with these holes.)

Reinstall the channel panel between the fan deck and

the panel to the left. The 3 holes in the left side flange

of the hood assembly should line up with the corre

sponding holes in the fan deck and the channel panel.

The 3 holes in the right side flange of the hood assem

bly should line up with the holes in the fan deck and

the holes in the channel clip described in the earlier

section. Economizer Hoods. Unit is now ready for in

stallation of economizer hoods.

Field Wire Routing — Field wiring can be brought

into the unit from the bottom (though basepan and roof curb)

or through the side of the unit (comer post next to control

box).

A 31/2 in. NPT coupling for field power wiring and a

%-in. NPT coupling for 24-v control wiring are provided in

the basepan. In the side post, there are two 3% in. knock

outs for the field power wiring. If control wiring is to be

brought in through the side of unit, a "Vs-in. diameter hole

must be drilled in the condenser side post next to the con

trol box.

There are 2 large block-off plates in the comer post. The

smaller block-off (5 in. x 5 in.) is used to provide access to

main unit control box during installation of power wiring.

The larger block-off (7% in. wide by 20-in. high) is located

between the two 3-%in. knockouts and is used when a 400-

amp disconnect box is rewired.

If disconnect box is mounted to comer post, be careful

not to drill any screws into the condenser coil. The comer

post is marked to indicate the area where it is safe to drill

holes and install screws.

ROUTING THROUGH BOTTOM OF UNIT - If wiring

is brought in through bottom of unit, use field-supplied

watertight conduit to run power wiring from basepan out

through bottom 3% in. knockout to the disconnect box and

back into the main control box. When 200-amp or smaller

disconnect is used, the disconnect box should be located so

that wiring can be mn from back of disconnect box to unit

through top 3% in. knockout. Watertight strain relief (field

supplied) must be used in knockout. When 400-amp dis

connect is used, remove 7% in. x 20-in. block-off in comer

post and use field-supplied elbow to route conduit through

comer post to the control box.

Use strain relief going into control box through 4% in.

diameter hole provided. After wires are in unit control

box, connect to power terminal block. See power wiring

section on page 15.

Low-voltage wiring must be mn in watertight conduit from

the basepan to control box and through one-in. diameter-

hole provided in upper righthand comer of unit control box.

Field-supplied strain relief must be used going into the box.

After wiring is in control box, make connections to proper

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Carrier 50LJ User Manual Page 14

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