Carrier 48HJD005-007 specifications Unit Leveling Tolerances, Condensate Drain Pan

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B	B-C	A-C
0.5	1.0	1.0

Fig. 2 — Unit Leveling Tolerances

Step 2 — Field Fabricate Ductwork — Secure all ducts to roof curb and building structure on vertical discharge units. Do not connect ductwork to unit. For horizontal applica- tions, field-supplied isolation flanges should be attached to hor- izontal discharge openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be in- sulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applica- ble fire codes.

A minimum clearance is not required around ductwork. Cabinet return-air static shall not exceed –.35 in. wg with Durablade economizer, or –.30 in. wg with EconoMi$er, or –.45 in. wg without economizer.

These units are designed for a minimum continuous return- air temperature in heating of 50 F (dry bulb), or an intermittent operation down to 45 F (dry bulb), such as when used with a night setback thermostat.

Step 3 — Install External Trap for Condensate Drain — The unit’s 3/4-in. condensate drain connections are located on the bottom and side of the unit. Unit discharge connections do not determine the use of drain connections; either drain connection can be used with vertical or horizontal applications.

When using the standard side drain connection, ensure the plug (Red) in the alternate bottom connection is tight before in- stalling the unit.

To use the bottom drain connection for a roof curb installa- tion, relocate the factory-installed plug (Red) from the bottom connection to the side connection. See Fig. 3. The piping for the condensate drain and external trap can be completed after the unit is in place.

All units must have an external trap for condensate drain- age. Install a trap 4-in. deep and protect against freeze-up. If drain line is installed downstream from the external trap, pitch the line away from the unit at 1 in. per 10 ft of run. Do not use a pipe size smaller than the unit connection (3/4 in.).

Step 4 — Rig and Place Unit — Inspect unit for transportation damage, and file any claim with transportation agency. Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit, and rollers may be used to move unit across a roof. Level by using unit frame as a

CONDENSATE PAN (SIDE VIEW)

DRAIN PLUG

NOTE: Drain plug is shown in factory-installed position.

Fig. 3 — Condensate Drain Pan

reference. See Table 1 and Fig. 4 for additional information. Operating weight is shown in Table 1 and Fig. 4.

Lifting holes are provided in base rails as shown in Fig. 5. Refer to rigging instructions on unit.

All panels must be in place when rigging and lifting.

POSITIONING — Maintain clearance around and above unit to provide minimum distance from combustible materials, prop- er airflow, and service access. See Fig. 5. A properly positioned unit will have the following clearances between unit and roof curb; 1/4-in. clearance between roof curb and base rails on each side and duct end of unit; 1/4 in. clearance between roof curb and condenser coil end of unit. (See Fig. 1, section C-C.)

Do not install unit in an indoor location. Do not locate unit air inlets near exhaust vents or other sources of contaminated air.

Be sure that unit is installed such that snow will not block the combustion intake or flue outlet.

Unit may be installed directly on wood flooring or on Class A, B, or C roof-covering material when roof curb is used.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

Locate mechanical draft system flue assembly at least 48 in. from any opening through which combustion products could enter the building, and at least 48 in. from an adjacent building. When unit is located adjacent to public walkways, flue assem- bly must be at least 7 ft above grade.

NOTE: When unit is equipped with an accessory flue dis- charge deflector, allowable clearance is 18 inches.

Flue gas can deteriorate building materials. Orient unit such that flue gas will not affect building materials.

Adequate combustion-air space must be provided for proper operation of this equipment. Be sure that installation complies with all local codes and Section 5.3, Air for Combustion and Ventilation, NFGC (National Fuel Gas Code), ANSI (Ameri- can National Standards Institute) Z223.1-1984 and addendum Z223.1a-1987. In Canada, installation must be in accordance with the CAN1.B149.1 and CAN1.B149.2 installation codes for gas burning appliances.

Flue vent discharge must have a minimum horizontal clear- ance of 4 ft from electric and gas meters, gas regulators, and gas relief equipment.

After unit is in position, remove shipping materials and rig- ging skids.

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