Bryant 548J*17 D Series Installation Instructions Manual Download Page 12

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INSTALLATION

Jobsite Survey

Complete the following checks before installation.

1. Consult local building codes and the NEC (National

Electrical Code) ANSI/NFPA 70 for special installa-

tion requirements.

2. Determine unit location (from project plans) or select

unit location.

3. Check for possible overhead obstructions which may

interfere with unit lifting or rigging.

Step 1 — Plan for Unit Location

Select a location for the unit and its support system (curb

or other) that provides for the minimum clearances

required for safety. This includes the clearance to

combustible surfaces, unit performance and service access

below, around and above unit as specified in unit

drawings. See Fig. 4.

NOTE

: Consider also the effect of adjacent units.

Unit may be installed directly on wood flooring or on Class

A, B, or C roof--covering material when roof curb is used.

Do not install unit in an indoor location. Do not locate air

inlets near exhaust vents or other sources of contaminated

air.

Although unit is weatherproof, avoid locations that permit

water from higher level runoff and overhangs to fall onto

the unit.

Select a unit mounting system that provides adequate

height to allow installation of condensate trap per

requirements. Refer to Step 9 — Install External

Condensate Trap and Line – for required trap dimensions.

Roof Mount —

Check

building

codes

for

weight

distribution

requirements. Unit operating weight is shown in Table 4.

Table 4 – Operating Weights

548J***D

UNITS LB (KG)

Base Unit

1775 (807)

2100 (955)

Economizer

246 (112)

Powered Outlet

35 (16)

Curb

14---in./356 mm

240 (109)

255 (116)

24---in./610 mm

340 (154)

355 (161)

Step 2 — Plan for Sequence of Unit Installation

The support method used for this unit will dictate different

sequences for the steps of unit installation. For example,

on curb--mounted units, some accessories must be

installed on the unit before the unit is placed on the curb.

Review the following for recommended sequences for

installation steps.

Curb--Mounted Installation —

Install curb
Install field--fabricated ductwork inside curb
Install thru--base service connection fittings (affects

curb and unit)
Rig and place unit
Remove top skid
Install condensate line trap and piping
Make electrical connections
Install other accessories

Pad--Mounted Installation —

Prepare pad and unit supports
Rig and place unit
Remove duct covers and top skid
Install field--fabricated ductwork at unit duct openings
Install condensate line trap and piping
Make electrical connections
Install other accessories

Frame--Mounted Installation —

Frame--mounted applications generally follow the

sequence for a curb installation. Adapt as required to

suit specific installation plan.

Step 3 — Inspect unit

Inspect unit for transportation damage. File any claim

with transportation agency.

Confirm before installation of unit that voltage, amperage

and circuit protection requirements listed on unit data

plate agree with power supply provided.

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown in

Fig. 7 (size 17 units) and Fig. 8 (size 24 units). Assemble

and install accessory roof curb in accordance with

instructions shipped with the curb.

NOTE

: The gasketing of the unit to the roof curb is

critical for a watertight seal. Install gasket supplied with
the roof curb as shown in Fig. 7 and Fig. 8. Improperly
applied gasket can also result in air leaks and poor unit
performance.
Curb should be level. This is necessary for unit drain to

function properly. Unit leveling tolerances are show in

Fig. 9 (on page 15). Refer to Accessory Roof Curb

Installation Instructions for additional information as

required.