International comfort products RGH072 Installation Instructions Manual Download Page 9

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509 01 3808 00

Specifications are subject to change without notice.

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.

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 accessory thru--base service connection package

(affects curb and unit) (refer to accessory installation

instructions for details)
Prepare bottom condensate drain connection to suit

planned condensate line routing (refer to Step 11 for

details)
Rig and place unit
Install outdoor air hood
Install flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories

Pad--mounted Installation —

Prepare pad and unit supports
Check and tighten the bottom condensate drain

connection plug

Rig and place unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install flue hood
Install gas piping
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.

On units with hinged panel option, check to be sure all

latches are snug and in closed position.

Locate the carton containing the outside air hood parts;

see Fig. 9 on page 13. Do not remove carton until unit has

been rigged and located in final position.

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown in

Fig. 4. 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. 4. 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 shown in

Fig. 5. Refer to Accessory Roof Curb Installation

Instructions for additional information as required.

Table 1 – Operating Weights

RGS

UNITS LB (KG)

072/073

090

102

110/120

Base Unit

765 (347)