International Comfort Products RHS Installation Manual

INSTALLATION INSTRUCTIONS

R−410A Single Package Rooftop Heat Pumps

RHS181 − 243

These instructions must be read and understood completely before attempting installation

Safety Labeling and Signal Words

DANGER, WARNING, CAUTION, and NOTE

The signal words DANGER, WARNING,
CAUTION, and NOTE are used to identify levels of

hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manual that may
apply to the product.

DANGER − Immediate hazards which will result in
severe personal injury or death.

WARNING −Hazards or unsafe practices which
could result in severe personal injury or death.

CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.

NOTE − Used to highlight suggestions which will
result in enhanced installation, reliablility, or
operation.

Signal Words in Manuals

The signal word WARNING is used throughout
this manual in the following manner:

!

WARNING

The signal word CAUTION is used throughout
this manual in the following manner:

!

CAUTION

Signal Words on Product Labeling

Signal words are used in combination with
colors and/or pictures or product labels.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 2..................

INSTALLATION 6..............................

Step 1 − Plan for Unit Location 6.................

Step 2 − Plan for Sequence of Unit Installation 7...

Step 3 − Inspect Unit 7.........................

Step 4 − Provide Unit Support 7..................

Step 5 − Field Fabricate Ductwork 10..............

Step 6 − Rig and Place Unit 10...................

Step 7 − Duct Connection 10.....................

Step 8 − Install Outside Air Hood 11...............

Step 9 − Install External condensate Trap &

Piping 12...............................

Step 10 − Make Electrical Connections 13..........

Step 11 − Adjust Factory−Installed Options 19......

Step 12 − Install Accessories 19..................

Unit Wire/Fuse or HACR Breaker Sizing Data 21....

Typical Wiring Diagrams 24......................

!

WARNING

PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD

Failure to carefully read and follow this warning
could result in equipment malfunction, property
damage, personal injury and/or death.

Installation or repairs made by unqualified
persons could result in equipment malfunction,
property damage, personal injury and/or death.

The information contained in this manual is
intended for use by a qualified service technician
familiar with safety procedures and equipped
with proper tools and test instruments.

Installation must conform with local building
codes and with the national Electrical Code
NFPA70 current edition or Canadian Electrical
Code part 1 CSA C.22.1.

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SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service
agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use
factory−authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with
the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA70, National
Electrical Code (NEC); in Canada, CSA C22.1) for special
requirements.

!

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury
or death.

Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lockout tag. Unit may have more than one power switch.

!

WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal injury,
death and/or equipment damage.

R−410A refrigerant systems operate at higher pressures
than standard R−22 systems. Do not use R−22 service
equipment or components on R−410A refrigerant
equipment.

Recognize safety information. This is the safety−alert
symbol . When you see this symbol in instructions or manuals,
be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety−alert symbol. DANGER identifies the most serious
hazards which will result in serious injury or death. WARNING
signifies a hazard which could result in serious injury or death.
CAUTION is used to identify unsafe practices which may result
in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in
enhanced installation, reliability, or operation.

These instructions cover minimum requirements and conform
to existing national standards and safety codes. In some
instances, these instructions exceed certain local codes and
ordinances, especially those that may not have kept up with
changing residential construction practices. We require these
instructions as a minimum for a safe installation.

!

!

WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD

Failure to follow this warning could cause personal injury
or death

Relieve pressure and recover all refrigerant before
system repair or final unit disposal.

Ware safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.

!

CUT HAZARD

Failure to follow this caution may result in personal
injury.

Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
air conditioning units.

CAUTION

2

516 01 2601 01

FIGURE 1 RHS Base Unit Dimensions: 15 Ton

Connection Sizes

A 1-3/8” [35] DIA Field Power Supply Hole
B 3” [76] Field Power Supply Knockout
C 3-5/8” [92] Field Power Supply Knockout
D 7/8” [22] Field Control Wiring Hole
E 3/4” 14 NPT Condensate Drain

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3

Fig. 1 − Unit Dimensional Drawing − 15 Ton

Unit Size

RHS 15 Ton 2156 980 581 264 442 201 489 222 643 292 45-1/4 [1149] 55-1/2 [1405] 16-1/2 [419]

Base Unit Weight

LBS. KG. LBS. KG. LBS. KG. LBS. KG. LBS. KG. X Y Z

Corner WeightACorner WeightBCorner Weight

C

Corner Weight

D

Center of Gravity

4

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FIGURE 2 RHS Base Unit Dimensions: 20 Ton

Connection Sizes

A 1-3/8” [35] DIA Field Power Supply Hole
B 3” [76] Field Power Supply Knockout
C 3-5/8” [92] Field Power Supply Knockout
D 7/8” [22] Field Control Wiring Hole
E 3/4” 14 NPT Condensate Drain

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5

Fig. 2 − Unit Dimensional Drawing − 20 Ton

Unit Size

RHS 20 Ton 2200 998 633 288 609 277 607 276 631 287 43 [1092] 69-1/2 [1765] 16-1/2 [419]

Base Unit Weight

LBS. KG. LBS. KG. LBS. KG. LBS. KG. LBS. KG. X Y Z

Corner WeightACorner WeightBCorner Weight

C

Corner Weight

D

Center of Gravity

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 installation
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. 3.

6

FIGURE 3

Service Clearance Dimansional Drawing

36" (914)

42" (1067)

18" (457)

NOTE:Consider also the effect of adjacent units.

516 01 2601 01

42" (1067)

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 Trap for Condensate Drain
– 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 roof curb
Install field−fabricated ductwork inside curb
Install accessory thru−base service connection package, if

used, (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. 4 (15 ton units) and Fig. 5 (20 ton 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. 4 and Fig. 5. 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. 6.
Refer to Accessory Roof Curb Installation Instructions for
additional information as required.

Install insulation, cant strips, roofing felt, and counter flashing
as shown. Ductwork must be attached to curb and not to the

unit. The accessory thru−the−base power and gas
connection package must be installed before the unit is set
on the roof curb.

If electric and control wiring is to be routed through the
basepan remove knockouts in basepan located in control
box area, see Fig. 7 for location. Attach the service
connections to the basepans.

Slab Mount (Horizontal Units Only) —

Provide a level concrete slab that extends a minimum of 6 in.
(150 mm) beyond unit cabinet. Install a gravel apron in front
of condenser coil air inlet to prevent grass and foliage from
obstructing airflow.

NOTE:Horizontal units may be installed on a roof curb if
required.

Alternate Unit Support (In Lieu of Curb or Slab Mount) —

A non−combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the
long sides of the unit with a minimum of 4 equally spaced
4−in. x 4−in. (102 mm x 102 mm) pads on each side. Locate
pads so that they support the rails. Make sure to avoid the
fork openings.

Table 1—Operating Weights

UNITS LB (KG)

Component 15 Ton 20 Ton
Base Unit 2035 [923] 2200 [998]
Economizer 245 [111] 245 [111]
Curb
14−in/356 mm 243 [111] 273 [124]
24−in/610 mm 315 [143] 350 [159]

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FIGURE 4

RoofCurb Accessory A Unit Size

CRRFCURB045A00 1' 2 “ [356]
CRRFCURB046A00 2' 0” [610]

Roof Curb Details RHS

15 Ton

8

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