Installation, Jobsite survey – Carrier SINGLE PACKAGE ROOFTOP 48HC User Manual

Page 9

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.

36” (914)

42” (1067)

36” (914)

96” (2438)

C10638

Fig. 4 -- Service Clearance Dimensional Drawing

Be sure that the unit is installed such that snow will not

block the combustion air intake or flute outlet.

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. For proper unit operation, adequate combustion and

ventilation air must be provided in accordance with

Section 5.3 (Air for Combustion and Ventilation) of the

National Fuel Gas Code, ANSI Z223.1 (American

National Standards Institute) and NFPA (National Fire

Protection Association) 54 TIA----54----84----1. In Canada,

installation must be in accordance with the CAN1----B149

installation codes for gas burning appliances.

Although unit is weatherproof, avoid locations that permit

water from higher level runoff and overhangs to fall onto

the unit.

Locate mechanical draft system flue assembly at least 4 ft

(1.2 m) from any opening through which combustion

products could enter the building, and at least 4 ft (1.2 m)

from any adjacent building (or per local code). Locate the

flue assembly at least 10 ft (3.05 m) from an adjacent

unit’s fresh air intake hood if within 3 ft (0.91 m) of same

elevation (or per local code). When unit is located

adjacent to public walkways, flue assembly must be at

least 7 ft (2.1 m) above grade.

Select a unit mounting system that provides adequate

height to allow installation of condensate trap per

requirements. Refer to Step 11 — 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 1.

Table 1 – Operating Weights

48HC**

UNIT LB (KG)

Base Unit

1892 (858)

2102 (954)

2247 (1019)

2292 (1040)

Economizer

245 (111)

Powered Outlet

32 (15)

Humidi---MiZerR System

83 (38)

88 (40)

92 (42)

Curb

14---in/356 mm

273 (124)

24---in/610 mm

350 (159)

48H