Carrier 48HC installation instructions Plan for Unit Location, Roof Mount, Operating Weights

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.

96” (2438)

36” (914)

42” (1067)

42” (1067) 36” (914)

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.

48HC

Table 1 – Operating Weights

48HC**				UNIT LB (KG)
	17		20		24
Base Unit	1892 (858)		2102 (954)		2247	(1019)
Economizer	245	(111)	245	(111)	245	(111)
Powered Outlet	32	(15)	32	(15)	32	(15)
Humidi--- MiZerR System	83	(38)	83	(38)	88	(40)
Curb
14--- in/356 mm	273	(124)	273	(124)	273	(124)
24--- in/610 mm	350	(159)	350	(159)	350	(159)

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2292 (1040)

245(111)

32(15)

92(42)

273(124)

350(159)

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