Carrier Single Package Rooftop 48Hc Users Manual 11SI

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2015-01-24

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48HC

Single Package Rooftop

Gas Heating/Electric Cooling Unit

with Puronr(R---410A) Refrigerant

Sizes: 17, 20, 24, 28

Installation Instructions

NOTE: Read the entire instruction manual before starting

the installation

TABLE OF CONTENTS

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

INSTALLATION 9...............................

Jobsite Survey 9................................

Step 1 -- Plan for Unit Location 9..................

Roof Mount 9...............................

Step 2 -- Plan for Sequence of Unit Installation 10.....

Curb--Mount Installation 10....................

Pad--Mount Installation 10.....................

Frame--Mount Installation 10...................

Step 3 -- Inspect Unit 10..........................

Step 4 -- Provide Unit Support 10..................

Roof Curb Mount 10.........................

Slab Mount (Horizontal Units Only) 10..........

Alternate Unit Support

(In Lieu of Curb or Slab Mount) 10.............

Step 5 -- Field Fabricate Ductwork 14...............

Step 6 -- Rig and Place Unit 14....................

Positioning on Curb 15.......................

Step 7 -- Horizontal Duct Connection 15............

Step 8 -- Install Outside Air Hood — Factory Option 15..

Step 9 -- Install Flue Hood and Combustion Air Hood 16..

Step 10 -- Install Gas Piping 16....................

Gas Supply Line 16..........................

Factory--Option Thru--Base Connections 18.......

Step 11 -- Install External Condensate Trap and Line 19..

Step 12 -- Make Electrical Connections 19...........

Field Power Supply 19........................

Units without Factory--Installed Disconnect 20....

Units with Factory--Installed Disconnect 20.......

All Units 20................................

Convenience Outlets 20.......................

Factory--Option Thru--Base Connections 22......

Units without Thru--Base Connections 22.........

Field Control Wiring 22.......................

Thermostat 22...............................

Unit without Thru--Base Conversion Kit 22.......

Heat Anticipator Settings 23...................

Transformer Connection

for 208--v Power Supply 23.....................

Humidi--MiZerRControl Connections 24..........

Humidi--MiZer -- Space RH Controller 24........

PremierLinkt(Factory Option) 26...............

Supply Air Temperature (SAT) Sensor 29.........

Outdoor Air Temperature (OAT) Sensor 29.......

EconoMi$er2 29.............................

Field Connections 29..........................

Space Sensors 31............................

Connect Thermostat 31.......................

Configure the Unit for Thermostat Mode 31......

Economizer Controls 32........................

Indoor Air Quality (CO2)Sensor 32.............

Outdoor Air Quality Sensor 32.................

Space Relative Humidity Sensor or

Humidistat Connections 33....................

Smoke Detector/Fire Shutdown (FSD) 34.........

Filter Status Switch 34........................

Supply Fan Status Switch 34...................

Remote Occupied Switch 34...................

Power Exhaust (output) 34.....................

CCN Communication Bus 35..................

RTU Open Control System 36...................

Supply Air Temperature (SAT) Sensor 39.........

Outdoor Air Temperature (OAT) Sensor 39.......

EconoMi$er2 39.............................

Field Connections 39..........................

Space Temperature (SPT) Sensors 40............

Indoor Air Quality (CO2)Sensor 40.............

Outdoor Air Quality Sensor 41.................

Space Relative Humidity Sensor or Humidistat 41..

Smoke Detector/Fire Shutdown (FSD) 42.........

Connecting Discrete Inputs 42..................

Communication Wiring -- Protocols 43............

General 43.................................

Local Access 44.............................

RTU Open Troubleshooting 44.................

Outdoor Air Enthalpy Control 45.................

Differential Enthalpy Control 45................

Smoke Detectors 46...........................

Return Air Sensor Tube Installation 46...........

Smoke Detector Test Magnet 47................

Additional Application Data 47.................

Step 13 -- Adjust Factory--Installed Options 50........

Step 14 -- Install Accessories 50...................

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.

It is important to recognize safety information. This is the

safety--alert symbol . When you see this symbol on the

unit and 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 severe personal injury or

death. WARNING signifies hazards which could result in

personal 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.

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury or death.

Disconnect gas piping from unit when leak testing at

pressure greater than 0.5 psig (3450 Pa). Pressures

greater than 0.5 psig (3450 Pa) will cause gas valve

damage resulting in hazardous condition. If gas valve

is subjected to pressure greater than 0.5 psig (3450

Pa), it must be replaced before use. When pressure

testing field--supplied gas piping at pressures of 0.5

psig (3450 Pa) or less, a unit connected to such piping

must be isolated by closing the manual gas valve.

!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 lock(s) and lockout tag(s). 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.

Puronr(R--410A) refrigerant systems operate at

higher pressures than standard R--22 systems. Do not

use R--22 service equipment or components on Puron

refrigerant equipment.

!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.

!WARNING

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 equipment.

CAUTION

48HC

C10896

Fig. 1 -- Unit Dimensional Drawing – 17 Size Unit

48HC

C10897

Fig. 1 -- Unit Dimensional Drawing – 17 Size Unit (cont.)

48HC

C10892

Fig. 2 -- Unit Dimensional Drawing – 20 and 24 Size Units

48HC

C10893

Fig. 2 -- Unit Dimensional Drawing – 20 and 24 Size Units (cont.)

48HC

C10900

Fig. 3 -- Unit Dimensional Drawing – 28 Size Unit

48HC

C10901

Fig. 3 -- Unit Dimensional Drawing – 28 Size Unit (cont.)

48HC

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)

17 20 24 28

Base Unit 1892 (858) 2102 (954) 2247 (1019) 2292 (1040)

Economizer 245 (111) 245 (111) 245 (111) 245 (111)

Powered Outlet 32 (15) 32 (15) 32 (15) 32 (15)

H u m i d i --- M i Z e r RSystem 83 (38) 83 (38) 88 (40) 92 (42)

Curb

14--- in/356 mm 273 (124) 273 (124) 273 (124) 273 (124)

24--- in/610 mm 350 (159) 350 (159) 350 (159) 350 (159)

48HC

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 thru--base service connection fittings (affects

curb and unit)

Rig and place unit

Remove top skid

Install outside air hood

Install smoke detector tube

Install combustion 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

Rig and place unit

Remove duct covers and top skid

Install smoke detector return air sensor tube

Install field--fabricated ductwork at unit duct openings

Install outside air hood

Install combustion 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.

Locate the carton containing the outside air hood parts; see

Figs. 5 and 12. 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

Figs. 6, 7 and 8. 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 Figs. 6, 7 and 8. 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. 9. 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. Thru--the--base power connection must be

installed before the unit is set on the roof curb. If

field--installed thru--the--roof curb gas connections are

desired remove knockout in basepan located in the gas

section, see Fig. 5 for location. Gas connections and

power connections to the unit must be field installed after

the unit is installed 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 of access panel; see Fig. 1, 2, or 3 for basepan

knockout locations for location. Attach the service

connections to the basepan.

Control Box

ccess Panel

Filter and

Indoor Coil

Access Panel

Indoor Blower

Access Panel

Gas Heat

Access Panel Compressor

(each side)

Hood Carton Location

(rear access panel)

C11154

Fig. 5 -- Typical Access Panel and Compressor Locations

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.

48HC

C10954

Fig. 6 -- Roof Curb Details – 17 Size Unit

48HC

C10955

Fig. 7 -- Roof Curb Details – 20 and 24 Size Units

48HC

C10956

Fig. 8 -- Roof Curb Details – 28 Size Unit

48HC

A-B

0.25” (6)

B-C

0.5” (12)

A-C

0.5” (12)

MAXIMUM ALLOWABLE

DIFFERENCE IN. (MM)

C10628

Fig. 9 -- Unit Leveling Tolerances

Step 5 — Field Fabricate Ductwork

Cabinet return-air static pressure (a negative condition)

shall not exceed 0.5 in. wg (87 Pa) with economizer or

without economizer.

For vertical ducted applications, secure all ducts to roof curb

and building structure. Do not connect ductwork to unit.

Fabricate supply ductwork so that the cross sectional

dimensions are equal to or greater than the unit supply

duct opening dimensions for the first 18 in. (458 mm) of

duct length from the unit basepan.

Insulate and weatherproof all external ductwork, joints,

and roof openings with counter flashing and mastic in

accordance with applicable codes.

Ducts passing through unconditioned spaces must be

insulated 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

applicable fire codes.

A minimum clearance is not required around ductwork.

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in damage

to roofing materials.

Membrane roofs can be cut by sharp sheet metal

edges. Be careful when placing any sheet metal parts

on such roof.

CAUTION

Step 6 — Rig and Place Unit

Keep unit upright and do not drop. Spreader bars are not

required if top crating is left on unit. Rollers may be used

to move unit across a roof. Level by using unit frame as a

reference. See Table 1 (on page 9) and Fig. 10 for

additional information.

Lifting holes are provided in base rails as shown in

Fig. 10. Refer to rigging instructions on unit.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in

equipment damage.

All panels must be in place when rigging. Unit is not

designed for handling by fork truck when packaging

is removed.

CAUTION

Before setting the unit onto the curb, recheck gasketing on

curb.

"B"

"C"

"A"

"914-1371"

(36"-54")

DETAIL A

SEE DETAIL A

PLACE ALL SEAL STRIP

IN PLACE BEFORE PLACING

UNIT ON ROOF CURB.

DUCT END

C09107

UNIT MAX WEIGHT DIMENSIONS

A B C

LB KG IN MM IN MM IN MM

48HC**17 2339 1061 127.8 3249 58.7 1491 52.3 1328

48HC**20 2549 1156 141.5 3595 71.5 1816 52.3 1328

48HC**24 2699 1224 141.5 3595 71.5 1816 60.3 1532

48HC**28 2748 1246 157.8 4007 80.3 2040 60.3 1532

NOTES:

1. Dimensions in ( ) are inches.

2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of

gravity. Use wooden top to prevent rigging straps from damaging unit.

Fig. 10 -- Rigging Details

48HC

PositioningonCurb—

Position unit on roof curb so that the following clearances

are maintained: 1/4in. (6 mm) clearance between the roof

curb and the base rail inside the right and left, 1/2in.

(12 mm) clearance between the roof curb and the base rail

inside the front and back. This will result in the distance

between the roof curb and the base rail inside on the

condenser end of the unit being approximately equal to

Details A and B in Figs. 6, 7 and 8.

Do not attempt to slide unit on curb after unit is set. Doing

so will result in damage to the roof curb seal.

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

Flue vent discharge must have a minimum horizontal

clearance of 48 in. (1220 mm) from electric and gas meters,

gas regulators, and gas relief equipment. Minimum distance

between unit and other electrically live parts is 48 inches

(1220 mm).

Flue gas can deteriorate building materials. Orient unit such

that flue gas will not affect building materials. Locate

mechanical draft system flue assembly at least 48 in. (1220

mm) from an adjacent building or combustible material.

After unit is in position, remove rigging skids and

shipping materials.

Step 7 — Horizontal Duct Connection

Refer to Figs. 1, 2 and 3 for locations and sizes of the

horizontal duct connections. Note that there are two different

return air duct connection locations – one for unit without an

economizer (on back side of unit) and a different one for

unit equipped with an economizer (on left end, under the

economizer hood). The supply air duct connection is on the

back side. See Fig. 11 for top view depicting typical

horizontal duct arrangements.

Return Air Duct

with Economize

Return Air Duct

without

Economizer

Horizontal

Supply Air

C10626

Supply Return without

Economizer

Return with

Economizer

Location Back Back Left end

H e i g h t --- I n . ( m m ) 157/8(402) 493/8(1253) 183/8(467)

W i d t h --- i n . ( m m ) 293/4(756) 233/8(593) 615/8(1564)

Fig. 11 -- Horizontal Duct Opening Dimensions

Field--supplied (3/4--inch) flanges should be attached to

horizontal duct openings (see Fig. 11) and all ductwork

should be secured to the flanges. Insulate and weatherproof

all external ductwork, joints, and roof or building openings

with counter flashing and mastic in accordance with

applicable codes.

Step 8 — Install Outside Air Hood — Factory

Option

The outside air hood for factory--option economizer and

two--position damper is shipped in knock--down form and

requires field assembly. The panel for the hood top is

shipped on the end of the unit (see Fig. 12). The

remaining parts for the hood assembly (including side

panels, filters and tracks) are shipped in a carton that is

secured to the rear of the blower assembly. Access the

carton location through rear panel (see Fig. 13).

Hood Top

Shipping

Position

C09134

Fig. 12 -- Hood Top – Shipping Position

To remove the hood parts package:

1. Remove the back blower access panel.

2. Locate and cut the strap, being careful to not damage

any wiring.

3. Carefully lift the hood package carton through the

back blower access opening.

See Fig. 14 for identification of the various parts of the

hood assembly.

Hood

Package

C09133

Fig. 13 -- Hood Package – Shipping Location

48HC

To assemble the outside air hood:

1. Remove hood top panel from shipping position on

unit end.

2. Install four angles to the upper end panel using the

screws provided.

3. Apply seal strip to mating flanges on the side plates

of the hood (see Fig. 14).

pply Seal Strips

to the back of

these flanges

Apply Seal Strip

to the front of

this flange

Apply Seal Strip

to the front of

this flange

Apply Seal Strip

to the back of

this flange

Seal Strips

Apply Seal Strips

to the back of

these surfaces

Item # Description Qty

1 Angles 4

2 Side Plates 2

3 Hood 1

4 Outdoor Air Screens 4

5 Side Filter Supports 2

6 Side Drip Angles 2

7 Top Diverters 2

C09079

Fig. 14 -- Hood Part Identification and Seal Strip

Application Areas

4. Secure side plates to panel using the screws provided.

5. Apply seal strip to mating flange of the hood (see

Fig. 14).

6. Secure top flange using screws provided in kit.

7. Install outdoor air screens by sliding them into the

channel formed by the four angles installed in step 2.

Make sure that the screens extend across the entire

length of the hood.

8. Install side filter supports using the screws provided.

9. Install side drip angles using the screws provided.

10. Run a continuous length of seal strip across the hood

covering the engagement holes in the lower hood.

11. Install top diverter using the screws provided.

12. On units with barometric relief, remove screws at bot-

tom of relief damper. Do not discard damper door.

C09090

Fig. 15 -- Hood Assembly – Completed

Step 9 — Install Flue Hood and Combustion Air

Hood

The flue hood is shipped screwed to the fan deck inside

the burner compartment. Remove the burner access panel

and then remove the flue hood from its shipping location.

Using the screws provided, install flue hood in the

location shown in Fig. 16.

The combustion air hood is attached to the back of the

burner access panel. Remove the two screws securing the

hood to the back of the burner access panel. Using the two

screws, re--attach the hood to the front of the burner

access panel as shown in Fig. 16.

Flue Hood

Combustion

Air Hood

C10744

Fig. 16 -- Flue Hood and Combustion Air Hood Details

Step 10 — Install Gas Piping

Installation of the gas piping must be in accordance with

local building codes and with applicable national codes.

In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel

Gas Code (NFGC). In Canada, installation must be

accordance with the CAN/CSA B149.1 and CAN/CSA

B149.2 installation codes for gas burning appliances.

This unit is factory equipped for use with Natural Gas fuel

at elevations up to 2000 ft (610 m) above sea level. Unit

may be field converted for operation at elevations above

2000 ft (610 m) and/or for use with liquefied petroleum

fuel. See accessory kit installation instructions regarding

these accessories.

NOTE: Furnace gas input rate on rating plate is for

installation up to 2000 ft (610 m) above sea level. In

U.S.A. the input rating for altitudes above 2000 ft (610 m)

must be derated by 4% for each 1000 ft (305 m) above sea

level. In Canada the input rating must be derated by 10%

for altitudes of 2000 ft (610 m) to 4500 ft (1372 m) above

sea level.

For natural gas applications, gas pressure at unit gas

connection must not be less than 5 in. wg (1246 Pa) or

greater than 13 in. wg (3240 Pa) while the unit is

operating. For liquified petroleum applications, the gas

pressure must not be less than 11 in. wg (2740 Pa) or

greater than 13 in. wg (3240 Pa) at the unit connection.

Gas Supply Line —

The gas supply pipe enters the unit adjacent to the burner

access panel on the front side of the unit, through the

grommeted hole. The gas connection to the unit is made

to the 3/4in. FPT gas inlet port on the unit gas valve.

Table 2 lists typical 3/4inch NPT (National Pipe Thread)

field supplied pipe fittings required for Thru--Base gas

supply, starting from the unit gas valve (see Fig. 17).

48HC

Table 2 – Typical 3/4--in NPT Field Supplied Piping Parts

Item Qty CPN Description

1 1 CA15RA201 90 Deg Street Elbow

2 1 CA01CA226 5 Inch Long Nipple

3 1 CA85RA201 Ground---Joint Union

4 1 CA01CA218 3 Inch Long Nipple

5 1 CA05RA201 90 Deg Elbow

6 1 CA01CA250 12 Inch Long Nipple

7 1 CA05RA201 90 Deg Elbow

8 1 CA01CA218 3 Inch Long Nipple

9 1 CA20RA201 TEE

10 1CA01CN222 4 Inch Long Nipple (Sediment Trap)

11 1CA38RA201 Cap

12 1CA01CA220 31/2Inch Long Nipple

13 1GB30 NIBCORBall Valve

14 1CA01CA238 8 Inch Long Nipple

15 1CA05RA201 90 Deg Elbow

Pipe gas supply into 90 degree elbow item 15 (see Table 2)

through the hole in the unit basepan.

For typical 3/4inch NPT field supplied fittings required

for NON Thru--Base gas supply starting from the unit gas

valve, omit items 14 and 15 from Table 2 and pipe gas

supply into TEE. See Fig. 18.

Table 3 – Natural Gas Supply Line Pressure Ranges

UNIT MODEL UNIT SIZE MIN MAX

48HC** 17, 20, 24, 28 5.0 in. wg

(1246 Pa)

13.0 in. wg

(3240 Pa)

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage

to equipment.

When connecting the gas line to the unit gas valve,

the installer MUST use a backup wrench to prevent

damage to the valve.

CAUTION

Install a gas supply line that runs to the unit heating

section. Refer to the NFPA 54/NFGC or equivalent code

for gas pipe sizing data. Do not use a pipe smaller than the

size specified. Size the gas supply line to allow for a

maximum pressure drop of 0.5--in wg (124 Pa) between

gas regulator source and unit gas valve connection when

unit is operating at high--fire flow rate.

The gas supply line can approach the unit in two ways:

horizontally from outside the unit (across the roof), or

through unit basepan. Observe clearance to gas line

components per Fig. 19.

54321

C10999

Fig. 17 -- Gas Supply Line Piping with Thru--Base

54321

C101006

Fig. 18 -- Gas Supply Line Piping

LEGEND

*Field supplied.

NOTE: Follow all local codes.

NFGC – National Fuel Gas Code

STEEL PIPE

NOMINAL DIAMETER

(in.)

SPACINGOFSUPPORTS

X DIMENSION

(ft)

or 1

or larger

BASE UNIT

BASE RAIL

ROOF

CURB

9” MINIMUM CLEARANCE

FOR PANEL REMOVAL

MANUAL GAS

SHUTOFF VALVE

GAS

REGULATOR*

48” MINIMUM

DRIP LEG

PER NFGC*

FIELD-

FABRICATED

SUPPORT*

FROM

GAS

METE

C11121

Fig. 19 -- Gas Piping Guide

48HC

Factory--Option Thru--Base Connections —

Electrical Connections: Knockouts are located in the

control box area. Remove the appropriate size knockout

for high voltage connection. Use the field supplied

connector depending on wiring or conduit being utilized.

Remove the 7/8--in (22mm) knockout and appropriate

connector for low voltage wiring. If non--unit powered

convenience outlet is being utilized, remove the 7/8-- i n

(22mm) knockout and utilize appropriate connector for

115 volt line. See “Step 12 — Making Electrical

Connections” for details.

Gas Connections: Remove the knockout in the base pan

and route 3/4--in. gas line up through the opening. Install

an elbow and route gas line through opening in panel after

first removing plastic bushing. Install a gas shut off

followed by a drip leg and ground--joint union. Route gas

line into gas section through the grommet (Part #:

KA56SL112) at the gas inlet and into the gas valve. See

Fig. 17 and Table 2. If a regulator is installed, it must be

located 4 feet (1.22 meters) from the flue outlet.

Some municipal codes require that the manual shutoff

valve be located upstream of the sediment trap. See

Fig. 18 for typical piping arrangements for gas piping that

has been routed through the sidewall of the base pan.

When installing the gas supply line, observe local codes

pertaining to gas pipe installations. Refer to the NFPA

54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA

B149.1). In the absence of local building codes, adhere to

the following pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe

1/4--in. in every 15 ft (7 mm in every 5 m) to prevent

traps. Grade all horizontal runs downward to risers.

Use risers to connect to heating section and to meter.

2. Protect all segments of piping system against physical

and thermal damage. Support all piping with appro-

priate straps, hangers, etc. Use a minimum of one

hanger every 6 ft (1.8 m). For pipe sizes larger than

1/2--in., follow recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and only to

male threads of joint when making pipe connections.

Use only pipe dope that is resistant to action of lique-

fied petroleum gases as specified by local and/or nation-

al codes. If using PTFE (Teflon) tape, ensure the materi-

al is Double Density type and is labeled for use on gas

lines. Apply tape per manufacturer’s instructions.

4. Pressure--test all gas piping in accordance with local

and national plumbing and gas codes before connect-

ing piping to unit.

NOTE: Pressure test the gas supply system after the gas

supply piping is connected to the gas valve. The supply

piping must be disconnected from the gas valve during the

testing of the piping systems when test pressure is in

excess of 0.5 psig (3450 Pa). Pressure test the gas supply

piping system at pressures equal to or less than 0.5 psig

(3450 Pa). The unit heating section must be isolated from

the gas piping system by closing the external main manual

shutoff valve and slightly opening the ground--joint union.

Check for gas leaks at the field--installed and

factory--installed gas lines after all piping connections have

been completed. Use soap--and--water solution (or method

specified by local codes and/or regulations).

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury, death and/or property damage.

SConnect gas pipe to unit using a backup wrench to

avoid damaging gas controls.

SNever purge a gas line into a combustion chamber.

SNever test for gas leaks with an open flame. Use a

commercially available soap solution made

specifically for the detection of leaks to check all

connections.

SUse proper length of pipe to avoid stress on gas

control manifold.

!WARNING

NOTE: If orifice hole appears damaged or it is suspected to

have been redrilled, check orifice hole with a numbered drill

bit of correct size. Never redrill an orifice. A burr--free and

squarely aligned orifice hole is essential for proper flame

characteristics.

BURNER

ORIFICE

A93059

Fig. 20 -- Orifice Hole

48HC

Step 11 — Install External Condensate Trap and

Line

The unit has one 3/4-in. condensate drain connection on

the end of the condensate pan (see Fig. 21). See Figs. 1, 2

and 3, item “E”, in the view labeled “BACK

(HORIZONTAL DISCHARGE)” for the location of the

condensate drain connection.

CONDENSATE

DRAIN

CONNECTION

C10729

Fig. 21 -- Condensate Drain Pan Connection

The piping for the condensate drain and external trap can

be completed after the unit is in place. Hand tighten

fittings to the drain pan fitting. Provide adequate support

for the drain line. Failure to do so can result in damage to

the drain pan. See Fig. 22.

NOTE: Trap should be deep enough to offset maximum unit static

difference. A 4” (102) trap is recommended.

MINIMUM PITCH

1” (25mm) PER

10’ (3m) OF LINE BASE RAIL

OPEN

VENT

TO ROOF

DRAIN

DRAIN PLUG

ROOF

CURB

SEE NOTE

2˝ (51) MIN

C08022

Fig. 22 -- Condensate Drain Piping Details

All units must have an external trap for condensate

drainage. Install a trap at least 4-in. (102 mm) 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 (25 mm in 3 m) of run. Do

not use a pipe size smaller than the unit connection

(3/4-in.).

Step 12 — Make Electrical Connections

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Do not use gas piping as an electrical ground. Unit

cabinet must have an uninterrupted, unbroken electrical

ground to minimize the possibility of personal injury if

an electrical fault should occur. This ground may consist

of electrical wire connected to unit ground lug in control

compartment, or conduit approved for electrical ground

when installed in accordance with NEC (National

Electrical Code); ANSI/NFPA 70, latest edition (in

Canada, Canadian Electrical Code CSA [Canadian

Standards Association] C22.1), and local electrical

codes.

!WARNING

NOTE: Field--supplied wiring shall conform with the

limitations of minimum 63_F(33_C) rise.

Field Power Supply —

If equipped with optional Powered Convenience Outlet:

The power source leads to the convenience outlet’s

transformer primary are not factory connected. Installer

must connect these leads according to required operation

of the convenience outlet. If an always--energized

convenience outlet operation is desired, connect the

source leads to the line side of the unit--mounted

disconnect. (Check with local codes to ensure this method

is acceptable in your area.) On a unit without a

unit--mounted disconnect, connect the source leads to the

line side with unit field power leads. See Fig. 23.

LOAD

SIDE

SEE

DETAIL

DETAIL A

LINE

SIDE

BLK

YEL

BLU

CONTROL BOX

C11181

Fig. 23 -- Location of TB1

Field power wires are connected to the unit at line--side

pressure lugs on the terminal block (see wiring diagram

label for control box component arrangement) or at

factory--installed option non--fused disconnect switch. Use

copper conductors only.

NOTE: Make field power connections directly to line

connection pressure lugs only.

48HC

FIRE HAZARD

Failure to follow this warning could result in

intermittent operation or unsatisfactory performance.

Do not connect aluminum wire between disconnect

switch and air conditioning unit. Use only copper

wire.(SeeFig.24.)

!WARNING

COPPER

WIRE ONLY

ELECTRIC

DISCONNECT

SWITCH

ALUMINUM

WIRE

A93033

Fig. 24 -- Disconnect Switch and Unit

Units without Factory--Installed Disconnect —

When installing units, provide a disconnect switch per

NEC (National Electrical Code) of adequate size.

Disconnect sizing data is provided on the unit informative

plate. Locate on unit cabinet or within sight of the unit per

national or local codes. Do not cover unit informative

plate if mounting the disconnect on the unit cabinet.

Units with Factory--Installed Disconnect —

The factory--installed option disconnect switch is located

in the main control box. The manual switch handle is

accessible on the corner post adjacent to the control box

access panel.

All Units --

All field wiring must comply with NEC and all local code

requirements.

Size wire based on MCA (Minimum Circuit Amps) on the

unit informative plate. See Fig. 25 for power wiring

connections to the unit power terminal block and equipment

ground. Maximum wire size is 2/0 AWG per pole.

Provide a ground--fault and short--circuit over--current

protection device (fuse or breaker) per NEC Article 440

(or local codes). Refer to unit informative data plate for

MOCP (Maximum Over--current Protection) device size.

Voltage to compressor terminals during operation must be

within voltage range indicated on unit nameplate. See

Table 11. On 3--phase units, voltages between phases must

be balanced within 2% and the current within 10%. Use

the formula shown in the legend for Table 11 (see Note 2

on page 49) to determine the percent of voltage

imbalance.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage.

Operation on improper line voltage or excessive phase

imbalance constitutes abuse and may cause damage to

electrical components. Such operation would invalidate

any applicable Carrier warranty.

CAUTION

11 12 13

L1 L2 L3

TB1

208/230-3-60

460-3-60

575-3-60

Units Without Disconnect Option

Units With Disconnect Option

T1 T2 T3

L1 L2 L3

Factory

Wiring

Disconnect

per

NEC

Optional

Disconnect

Switch

C101000

Fig. 25 -- Power Wiring Connections

Convenience Outlets —

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.

Units with convenience outlet circuits may use

multiple disconnects. Check convenience outlet for

power status before opening unit for service. Locate

its disconnect switch, if appropriate, and open it.

Lock--out and tag--out this switch, if necessary.

!WARNING

48HC

Two types of convenience outlets are offered on 48HC

models: Non--unit powered and unit--powered. Both types

provide a 125--volt GFCI (ground--fault circuit--interrupter)

duplex receptacle rated at 15--A behind a hinged access

cover, located on the corner panel of the unit. See Fig. 26.

Convenience

Outlet

Electric

Disconnect

Switch

Control Box

Access Panel

C10641

Fig. 26 -- Convenience Outlet Location

Installing Weatherproof Cover: A weatherproof

while-in-use cover for the factory-installed convenience

outlets is now required by UL standards. This cover cannot

be factory-mounted due to its depth; it must be installed at

unit installation. For shipment, the convenience outlet is

covered with a blank cover plate.

The weatherproof cover kit is shipped in the unit’s control

box. The kit includes the hinged cover, a backing plate

and gasket.

DISCONNECT ALL POWER TO UNIT AND

CONVENIENCE OUTLET. LOCK--OUT AND TAG--OUT

ALL POWER.

Remove the blank cover plate at the convenience outlet;

discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, until

approximately 1/2-in (13 mm) under screw heads are

exposed. Press the gasket over the screw heads. Slip the

backing plate over the screw heads at the keyhole slots

and align with the gasket; tighten the two screws until

snug (do not over-tighten).

Mount the weatherproof cover to the backing plate as

shown in Fig. 27. Remove two slot fillers in the bottom of

the cover to permit service tool cords to exit the cover.

Check for full closing and latching.

RECEPTACLE

NOT SHOWN

COVER – WHILE-IN-USE

WEATHERPROOF

BASE PLATE FOR

GFCI RECEPTACLE

C09022

Fig. 27 -- Weatherproof Cover Installation

Non--unit powered type: This type requires the field

installation of a general--purpose 125--volt 15--A circuit

powered from a source elsewhere in the building. Observe

national and local codes when selecting wire size, fuse or

breaker requirements and disconnect switch size and

location. Route 125--v power supply conductors into the

bottom of the utility box containing the duplex receptacle.

Unit--powered type: A unit--mounted transformer is

factory--installed to stepdown the main power supply

voltage to the unit to 115--v at the duplex receptacle. This

option also includes a manual switch with fuse, located in

a control box and mounted on a bracket behind the

convenience outlet; access is through the unit’s control

box access panel. See Fig. 26.

The primary leads to the convenience outlet transformer

are not factory--connected. If local codes permit, the

transformer primary leads can be connected at the

line--side terminals on the unit--mounted non--fused

disconnect switch; this will provide service power to the

unit when the unit disconnect switch is open. See Fig. 28.

C10730

UNIT

VOLTAGE

CONNECT

PRIMARY

CONNECTIONS

TRANSFORMER

TERMINALS

208,

230 240 L1: RED +YEL

L2: BLU + GRA

H1 + H3

H2 + H4

460 480

L1: RED

Splice BLU + YEL

L2: GRA

H2 + H3

575 600 L1: RED

L2: GRA

Fig. 28 -- Powered Convenience Outlet Wiring

48HC

2.0

50HE501288

NOTICE/AVIS

Convenience Outlet Utilization

Maximum Intermittent Use 15 - Amps

Maximum Continuous Use 8 - Amps

Observe a 50% limit on the circuit

Loading above 8 - Amps

Utilisation de la prise utilitaire

Usage intermittent maximum 15 - Amps

Usage continu maximum 8 - Amps

Observez une limite de 50% sur le circuit

Chargement au-dessus de 8 - Amps

C10077

Fig. 29 -- Convenience Outlet Utilization Notice

Test the GFCI receptacle by pressing the TEST button on

the face of the receptacle to trip and open the receptacle.

Check for proper grounding wires and power line phasing

if the GFCI receptacle does not trip as required. Press the

RESET button to clear the tripped condition.

Using unit--mounted convenience outlets: Units with

unit--mounded convenience outlet circuits will often

require that two disconnects be opened to de--energize all

power to the unit. Treat all units as electrically energized

until the convenience outlet power is also checked and

de--energization is confirmed. Observe National Electrical

Code Article 210, Branch Circuits, for use of convenience

outlets.

Factory--Option Thru--Base Connections —

All units are equipped with the ability to bring utilities

through the base.

Gas is brought up through an embossed area located in the

gas section behind the gas entrance post. Access is gained

through the gas access panel. A knock out must be

removed to accomplish this.

The electrical entrance is located in the control box area

and can be accessed through the control box access panel.

An embossed area is provided with three knock outs. High

voltage is brought through the multi knock out by

removing the appropriate size for the size of the fitting

required. A 7/8--in. knock out is provided for low voltage.

An additional 7/8--in. knock out is provided for a 115 volt

line which is used when the unit is equipped with the

non--unit powered convenience outlet option.

All required fittings are field supplied. Install fittings

when access to both top and bottom of the base pan is

available. See electrical and gas connections for routing

and connection information.

Units without Thru--Base Connections —

1. Install liquid tight conduit between disconnect and

control box.

2. Pull correctly rated high voltage wires through the

conduit.

3. Install power lines to terminal connections as shown

in Fig. 25.

Field Control Wiring —

The 48HC unit requires an external temperature control

device. This device can be a thermostat (field--supplied)

or a PremierLink controller (available as factory--installed

option or as field--installed accessory, for use on a Carrier

Comfort Network or as a stand alone control) or the RTU

Open for Building Management Systems using non--CCN

protocols (RTU Open is available as a factory--installed

option only).

Thermostat —

Install a Carrier--approved accessory 2--stage thermostat

according to installation instructions included with the

accessory. Locate the thermostat accessory on a solid wall

in the conditioned space to sense average temperature in

accordance with the thermostat installation instructions.

If the thermostat contains a logic circuit requiring 24--v

power, use a thermostat cable or equivalent single leads of

different colors with minimum of seven leads. If the

thermostat does not require a 24--v source (no “C”

connection required), use a thermostat cable or equivalent

with minimum of six leads. Check the thermostat

installation instructions for additional features which

might require additional conductors in the cable.

For wire runs up to 50 ft. (15 m), use no. 18 AWG

(American Wire Gage) insulated wire (35_C minimum).

For50to75ft.(15to23m),useno.16AWGinsulated

wire (35_C minimum). For over 75 ft. (23 m), use no. 14

AWG insulated wire (35_C minimum). All wire sizes

larger than no. 18 AWG cannot be directly connected to

the thermostat and will require a junction box and splice

at the thermostat.

Unit without Thru--Base Connection Kit —

Correctly rated low voltage wire can be routed through the

rubber grommet located on the corner post adjacent to the

control box access panel. Route wire through the grommet

and then route the wire behind the corner post utilizing the

factory provided wire ties secured to the control box. This

will insure separation of the field low voltage wire and the

high voltage circuit. Route the low voltage wire to the

central terminal board. See Fig. 30.

48HC

Typical

Thermostat

Corrections

O/B/Y2

(see Note)

Note: Typical multi-function marking. Follow manufacturer’s configuration

instructions to select Y2.

Field Wiring

Central

Terminal

Board

T–STAT

See

Caution

UNIT DAMAGE HAZARD

Failure to follow this caution may cause a short circuit.

CAUTION

Carefully check the connection of control coductor

for indoor fan control at terminal G. Connecting the

indoor fan lead to terminal C will cause a short circuit

condition which can cause component damage inside

the unit or at thermostat.

C10731

Fig. 30 -- Typical Low--Voltage Control Connections

NOTE: If utilizing the through the base connections,

route the low voltage wire through the wire ties to the

central terminal board.

Rubber

Grommet

Corner

Post

Wire

Ties

Thru the Base

Connection

C10734

Fig. 31 -- Field Control Wiring Raceway

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stage

and 0.14 amp for second--stage heating.

Transformer Connection for 208--v Power Supply —

All units except 208/230-v units are factory wired for the

voltage shown on the nameplate. If the 208/230-v unit is

to be connected to a 208-v power supply, the control

transformer must be rewired by moving the black wire

with the 1/4-in. female spade connector from the 230--v

connection and moving it to the 208-v 1/4-in. male

terminal on the primary side of the transformer. Refer to

unit label diagram for additional information.

48HC

Humidi--MiZerRControl Connections

Humidi--MiZer – Space RH Controller —

NOTE: The Humidi--MiZer is a factory installed option.

The Humidi--MiZer dehumidification system requires a

field--supplied and --installed space relative humidity

control device. This device may be a separate humidistat

control (contact closes on rise in space RH above control

setpoint) or a combination thermostat--humidistat control

device such as Carrier’s EDGERPro Thermidistat with

isolated contact set for dehumidification control. The

humidistat is normally used in applications where a

temperature control is already provided (units with

PremierLinktcontrol).

To connect the Carrier humidistat (HL38MG029):

1. Route the humidistat 2--conductor cable (field--sup-

plied) through the hole provided in the unit corner

post.

2. Feed wires through the raceway built into the corner

post (see Fig. 31) to the 24--v barrier located on the

left side of the control box. The raceway provides the

UL--required clearance between high--voltage and

low--voltage wiring.

3. Use wire nuts to connect humidistat cable to two

PINK leads in the low–voltage wiring as shown in

Fig. 34.

To connect the Thermidistat device (33CS2PPRH--01):

1. Route the Thermidistat multi--conductor thermostat

cable (field--supplied) through the hole provided in

the unit corner post.

2. Feed wires through the raceway built into the corner

post (see Fig. 31) to the 24--v barrier located on the

left side of the control box. The raceway provides the

UL--required clearance between high--voltage and

low--voltage wiring.

3. The Thermidistat has dry contacts at terminals D1

and D2 for dehumidification operation (see Fig. 35).

The dry contacts must be wired between CTB

terminal R and the PINK lead to the LTLO switch

with field--supplied wire nuts. Refer to the installation

instructions included with the Carrier Edge

Thermidistat device (Form 33CS--65SI or latest) for

more information.

% RELATIVE HUMIDITY

C09295

Fig. 32 -- Accessory Field--Installed Humidistat

C09296

Fig. 33 -- EDGE Pro Thermidistat

48HC

C11139

Fig. 34 -- Typical Humidi--MiZerRAdaptive Dehumidification System Humidistat Wiring

O/W2/B

OAT

RRS

SRTN

HUM

V+

EDGE Pro THERMIDISTAT Unit CTB

THERMOSTAT

*Connection not required.

Humidi-MiZer™ FIOP

C09298

Fig. 35 -- Typical Rooftop Unit with Humidi--MiZer Adaptive Dehumidification System

with EDGE Pro Thermidistat Device

48HC

PremierLinkt(Factory--Option)

C08199

Fig. 36 -- PremierLink Controller

The PremierLink controller (see Fig. 36) is compatible

with Carrier Comfort Networkr(CCN) devices. This

control is designed to allow users the access and ability to

change factory--defined settings, thus expanding the

function of the standard unit control board. CCN service

access tools include System Pilott, Touch Pilottand

Service Tool. (Standard tier display tools Navigatortand

Scrolling Marquee are not suitable for use with latest

PremierLink controller (Version 2.x).)

The PremierLink control is factory--mounted in the 48HC

unit’s main control box to the right of the Central Terminal

Board (CTB) (see Fig. 37). Factory wiring is completed

through harnesses connected to the CTB thermostat. Field

connections are made at a 16--pole terminal block (TB3)

located at the top of the unit control box in front of the

PremierLink controller. The factory--installed PremierLink

control includes the supply--air temperature (SAT) sensor.

The outdoor air temperature (OAT) sensor is included in the

FIOP/accessory EconoMi$ert2 package. (See page 45 for

accessory enthalpy controls.)

The PremierLink controller requires the use of a Carrier

electronic thermostat or a CCN connection for time

broadcast to initiate its internal timeclock. This is

necessary for broadcast of time of day functions

(occupied/unoccupied).

NOTE: PremierLink controller is shipped in Sensor

mode. To be used with a thermostat, the PremierLink

controller must be configured to Thermostat mode. Refer

to PremierLink Configuration instructions for Operating

Mode.

C10643

Fig. 37 -- 48HC Control Box Component Locations

48HC

C11140

Fig. 38 -- PremierLink Wiring Schematic

48HC

C11141

Fig. 39 -- PremierLink Wiring Schematic with Humidi--MiZerR

48HC

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 48HC unit, the unit is supplied with a

supply--air temperature (SAT) sensor (33ZCSENSAT).

This sensor is a tubular probe type, approx 6--inches (12.7

mm) in length. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is mounted in

the fan deck (see Fig. 40). It can be removed or

remounted per local codes.. Drill or punch a 1/2--in. hole

in the flange or duct. Use two field--supplied, self--drilling

screws to secure the sensor probe in a horizontal

orientation. Insure that the sensor wires do not contact the

hot surface of the heat exchanger.

SUPPLY AIR RETURN AIR

SUPPLY AIR

TEMPERATURE

SENSOR

ROOF

CURB

C10733

Fig. 40 -- Mounting Location for Supply Air

Temperature (SAT) Sensor on 48HC Units

NOTE: Refer to Form 33CS--67SI for complete

PremierLink configuration, operating sequences and

troubleshooting information. Have a copy of this manual

available at unit start--up.

NOTE: The sensor must be mounted in the discharge

airstream downstream of the cooling coil and any heating

devices. Be sure the probe tip does not come in contact

with any of the unit’s heater surfaces.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory--mounted in the EconoMi$er2 (FIOP

or accessory). It is a nominal 10k ohm thermistor attached

to an eyelet mounting ring.

EconoMi$er2 —

The PremierLink control is used with EconoMi$er2

(option or accessory) for outdoor air management. The

damper position is controlled directly by the PremierLink

control; EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced with

field--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)

Space CO2sensor

Outdoor air CO2sensor

Refer to Table 4 for accessory part numbers.

Field Connections

Field connections for accessory sensor and input devices

are made at the 16--pole terminal block (TB3, see Fig. 38

and Fig. 39) located on the control box top shelf in front

of the PremierLink control. Some input devices also

require a 24--vac signal source; connect at CTB terminal

R at “THERMOSTAT” connection strip for this signal

source. See connections figures on following pages for

field connection locations (and for continued connections

at the PremierLink board inputs).

Table 5 provides a summary of field connections for units

equipped with Space Sensor. Table 6 provides a summary of

field connections for units equipped with Space Thermostat.

Table 4 – PremierLink Sensor Usage

APPLICATION

OUTDOOR AIR

TEMPERATURE

SENSOR

RETURN AIR

TEMPERATURE

SENSOR

OUTDOOR AIR

ENTHALPY SENSOR

RETURN AIR

ENTHALPY SENSOR

Differential Dry Bulb

Temperature with

PremierLink

(PremierLink requires

4 --- 2 0 m A A c t u a t o r )

I n c l u d e d ---

CRTEMPSN001A00

R e q u i r e d ---

33ZCT55SPT

or equivalent

--- ---

Single Enthalpy with

PremierLink

(PremierLink requires

4 --- 2 0 m A A c t u a t o r )

I n c l u d e d ---

Not Used --- R e q u i r e s ---

33CSENTHSW ---

Differential Enthalpy

with PremierLink

(PremierLink requires

4 --- 2 0 m A A c t u a t o r )

I n c l u d e d ---

Not Used ---

R e q u i r e s ---

33CSENTHSW

or equivalent

R e q u i r e s ---

33CSENTSEN

or equivalent

NOTES:

CO2Sensors (Optional):

33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.

33ZCASPCO2 --- Aspirator box used for duct---mounted CO2room sensor.

33ZCT55CO2 --- Space temperature and CO2room sensor with override.

33ZCT56CO2 --- Space temperature and CO2room sensor with override and setpoint.

48HC

Table 5 – Space Sensor Mode

TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL

1T 5 5 --- S E N / T 5 6 --- S E N Analog (10k thermistor)

2RMTOCC Discrete, 24VAC

3T 5 5 --- S E N / T 5 6 --- S E N Analog (10k thermistor)

4CMPSAFE Discrete, 24VAC

5T56---SET Analog (10k thermistor)

6FSD Discrete, 24VAC

7LOOP---PWR Analog, 24VDC

8SPS Discrete, 24VAC

9IAQ---SEN A n a l o g , 4 --- 2 0 m A

10 FILTER Discrete, 24VAC

11 I A Q --- C O M / O A Q --- C O M / R H --- C O M A n a lo g , 4 --- 2 0 m A

12 CCN + (RED) Digital,,5VDC

13 OAQ ---SEN/RH ---SEN A n a l o g , 4 --- 2 0 m A

14 CCN Gnd (WHT) Digital, 5VDC

15 AUX OUT(Power Exhaust) (Output)Discrete 24VAC

16 CCN --- (BLK) Digital, 5VDC

LEGEND:

T55 --- Space Temperature Sensor

T56 --- Space Temperature Sensor

CCN --- Carrier Comfort Network (communication bus)

CMPSAFE --- Compressor Safety

FILTER --- Dirty Filter Switch

F S D --- F i r e S h u t d o w n

IAQ --- Indoor Air Quality (CO2)

OAQ --- Outdoor Air Quality (CO2)

RH --- Relative Humidity

SFS --- Supply Fan Status

Table 6 – Thermostat Mode

TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL

1RAT SEN Analog (10k thermistor)

2 G Discrete, 24VAC

3RAT SEN Analog (10k thermistor)

4Y1 Discrete, 24VAC

6Y2 Discrete, 24VAC

7LOOP---PWR Analog, 24VDC

8W1 Discrete, 24VAC

9I A Q --- S E N Analog, 4---20mA

10 W2 Discrete, 24VAC

11 I A Q --- C O M / O A Q --- C O M / R H --- C O M Analog, 4---20mA

12 CCN + (RED) Digital, 5VDC

13 O A Q --- S E N / R H --- S E N Analog, 4---20mA

14 CCN Gnd (WHT) Digital, 5VDC

15 AUX OUT (Power Exhaust) (Output) Discrete 24VAC

16 CCN --- (BLK) Digital, 5VDC

LEGEND:

CCN --- Carrier Comfort Network (communication bus)

G --- T h e r m o s t a t F a n

IAQ --- Indoor Air Quality (CO2)

OAQ --- Outdoor Air Quality (CO2)

RAT --- Return Air Temperature

RH --- Relative Humidity

W1 --- Thermostat Heat Stage 1

W2 --- Thermostat Heat Stage 2

Y1 --- Thermostat Cool Stage 1

Y2 --- Thermostat Cool Stage 2

48HC

Space Sensors —

The PremierLink controller is factory--shipped configured

for Space Sensor Mode. A Carrier T--55 or T--56 space

sensor must be used. T--55 space temperature sensor

provides a signal of space temperature to the PremierLink

control. T--56 provides same space temperature signal plus

it allows for adjustment of space temperature setpoints

from the face of the sensor by the occupants.

2345 61

SW1

SEN

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

C08201

Fig. 41 -- T--55 Space Temperature Sensor Wiring

Connect T--55: See Fig. 41 for typical T--55 internal

connections. Connect the T--55 SEN terminals to TB3

terminals 1 and 3 (see Fig. 42).

SEN J6-7

J6-6

TB3 PL

SEN

C10023

Fig. 42 -- PremierLink T--55 Sensor

Connect T--56: See Fig. 43 for T--56 internal connections.

Install a jumper between SEN and SET terminals as

illustrated. Connect T--56 terminals to TB3 terminals 1, 3

and 5 (see Fig. 44).

2345 61

SW1

SEN SET

Cool Warm

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

JUMPER

TERMINALS

AS SHOWN

BLK

(T56)

C08202

Fig. 43 -- T--56 Internal Connections

SEN J6-7

J6-6

TB3 PL

SEN

SET

Jumper

TB3 PL

J6-5

SET

C10022

Fig. 44 -- PremierLink T--56 Sensor

Connect Thermostat —

A 7--wire thermostat connection requires a 24--v power

source and a common connection. Use the R and C

terminals on the CTB’s THERMOSTAT connection strip

for these. Connect the thermostat’s Y1, Y2, W1, W2 and

G terminals to PremierLink TB3 as shown in Fig. 45.

If the 48HC unit is equipped with factory--installed smoke

detector(s), disconnect the factory BLU lead at TB3--6

(Y2) before connecting the thermostat. Identify the BLU

lead originating at CTB--DDC--1; disconnect at TB3--6

and tape off. Confirm that the second BLU lead at TB3--6

remains connected to PremierLink J4--8.

GJ4-12

J4-10

J4-8

J4-6

J4-4

SPACE

THERMOSTAT

CTB

THERMOSTAT

TB3

CTB

THERMOSTAT

C10283

Fig. 45 -- Space Thermostat Connections

If the 48HC unit has an economizer system and free--cooling

operation is required, a sensor representing Return Air

Temperature must also be connected (field--supplied and

installed). This sensor may be a T--55 Space Sensor (see Fig.

41) installed in the space or in the return duct, or it may be

sensor PNO 33ZCSENSAT, installed in the return duct.

Connect this sensor to TB3--1 and TB3--3 per Fig. 42.

Configure the Unit for Thermostat Mode —

Connect to the CCN bus using a CCN service tool and

navigate to PremierLink Configuration screen for

Operating Mode. Default setting is Sensor Mode (value

1). Change the value to 0 to reconfigure the controller for

Thermostat Mode.

When the PremierLink is configured for Thermostat

Mode, these functions are not available: Fire Shutdown

(FSD), Remote Occupied (RMTOCC), Compressor Safety

(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure

Switch (FILTER).

48HC

Economizer Controls

Indoor Air Quality (CO2)Sensor—

The indoor air quality sensor accessory monitors space

carbon dioxide (CO2) levels. This information is used to

monitor IAQ levels. Several types of sensors are available,

for wall mounting in the space or in return duct, with and

without LCD display, and in combination with space

temperature sensors. Sensors use infrared technology to

measure the levels of CO2present in the space air.

The CO2sensors are all factory set for a range of 0 to

2000 ppm and a linear mA output of 4 to 20. Refer to the

instructions supplied with the CO2sensor for electrical

requirements and terminal locations. See Fig. 46 for

typical CO2sensor wiring schematic.

87654321

24 VAC

24 VDC

NC ALARM

RELAY

CONTACTS

COM

}

0-10VDC

SIG COM

4-20mA

J3 J4

C08635

Fig. 46 -- Indoor/Outdoor Air Quality (CO2)Sensor

(33ZCSENCO2) -- Typical Wiring Diagram

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return--air

grille (if present) so it senses the concentration of CO2

leaving the space. The sensor should be mounted in a

location to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

Wiring the Indoor Air Quality Sensor: For each sensor,

use two 2--conductor 18 AWG (American Wire Gage)

twisted--pair cables (unshielded) to connect the separate

isolated 24 vac power source to the sensor and to connect

the sensor to the control board terminals.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 46. Connect the 4--20 mA terminal to

terminal TB3--9 and connect the SIG COM terminal to

terminal TB3--11. See Fig. 47.

J5-5

J5-3

TB3

IAQ Sensor PL

24 VAC

4-20mA

SIG COM

C11156

Fig. 47 -- Indoor CO2Sensor (33ZCSENCO2)

Connections

Refer to Form 33CS--67SI, PremierLink Installation,

Start--up, and Configuration Instructions, for detailed

configuration information.

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus

weatherproof enclosure) —

The outdoor air CO2sensor is designed to monitor carbon

dioxide (CO2) levels in the outside ventilation air and

interface with the ventilation damper in an HVAC system.

The OAQ sensor is packaged with an outdoor cover. See

Fig. 48. The outdoor air CO2sensor must be located in the

economizer outside air hood.

COVER REMOVED SIDE VIEW

C07135

Fig. 48 -- Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO2Sensor: A dedicated

power supply is required for this sensor. A two--wire cable

is required to wire the dedicated power supply for the

sensor. The two wires should be connected to the power

supply and terminals 1 and 2.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 46. Connect the 4 to 20 mA

terminal to the TB3--13 terminal of the 48HC. Connect the

SIG COM terminal to the TB3--11 terminal of the 48HC.

See Fig. 49.

48HC

J5-2

J5-3

TB3

OAQ Sensor PL

24 VAC

4-20mA

SIG COM

C11157

Fig. 49 -- Outdoor CO2Sensor Connections

Space Relative Humidity Sensor or Humidistat

Connections —

Space Relative Humidity Sensor connections: The

accessory space relative humidity sensor (33ZCSENSRH-01)

is installed on an interior wall to measure the relative

humidity of the air within the occupied space.

The use of a standard 2 X 4 inch electrical box to

accommodate the wiring is recommended for installation.

The sensor can be mounted directly on the wall, if

acceptable by local codes.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in

permanent damage to the sensor.

DO NOT clean or touch the sensing element with

chemical solvents as they can permanently damage the

sensor.

CAUTION

UNIT PERFORMANCE HAZARD

Failure to follow this caution will result in inaccurate

sensor readings.

DO NOT mount the sensor in drafty areas such as near

heating or air--conditioning ducts, open windows, fans,

or over heat sources such as baseboard heaters,

radiators, or wall--mounted dimmers. Sensors mounted

in those areas will produce inaccurate readings.

CAUTION

If the sensor is installed directly on a wall service, install the

humidity sensor using 2 screws and 2 hollow wall anchors

(field supplied). Do not over tighten screws. See Fig. 50.

SW2

12345 6

Io Vin Gnd Vo

MOUNTING

HOLES

WIRING

OPENING

C11084

Fig. 50 -- Space Relative Humidity Sensor Installation

The sensor must be mounted vertically on the wall. The

Carrier logo should be orientated correctly when the

sensor is properly mounted.

Avoid corner locations. Allow at least 4 ft between the

sensor and any corner. Airflow near corners tends to be

reduced, resulting in erratic sensor readings. The sensor

should be vertically mounted approximately 5 ft up from

the floor, beside the space temperature sensor.

For wiring distances up to 500 feet, use a 3--conductor, 18

or 20 AWG cable. ACCN communication cable can be

used, although the shield is not required. The shield must

be removed from the sensor end of the cable if this cable

is used. See Fig. 51 for wiring details.

Io VoVin Gnd

BLACK

RED

TB3-7

TB3-13

C11085

Fig. 51 -- Space Relative Humidity Sensor Connection

The power for the sensor is provided by the PremierLink

control on terminal J5--4 (+33 to +35vdc).

To wire the sensor:

1. At the sensor, remove 4 inches of the jacket from the

cable. Strip 1/4inch of insulation from each conduct-

or. Route the cable through the wire clearance open-

ing in the center of the sensor. See Fig. 50.

2. Connect a field--supplied BLACK wire to the sensor

screw terminal marked Vin.

3. Connect a field--supplied RED wire into the sensor

screw terminal marked Io.

4. Connect the field--supplied RED wire from the sensor

to TB3--13.

5. Connect the field--supplied BLACK wire from the

sensor to TB3--7.

Humidistat connections: A humidistat can not be directly

connected to the PremierLink controller. Follow the

instructions on pages 24 & 25 to connect a humidistat or a

thermostat as an electromechanical device.

48HC

Smoke Detector/Fire Shutdown (FSD) —

This function is available only when PremierLink is

configured for (Space) Sensor Mode. The unit is

factory--wired for PremierLink FSD operation when

PremierLink is factory--installed.

On 48HC units equipped with factory--installed Smoke

Detector(s), the smoke detector controller implements the

unit shutdown through its NC contact set connected to the

unit’s CTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The PremierLink

communicates the smoke detector’s tripped status to the

CCN building control. See Figs. 38 and 39, the PremierLink

wiring schematics.

Filter Status Switch —

This function is available only when PremierLink is

configured for (Space) Sensor Mode.

PremierLink control can monitor return filter status in two

ways: By monitoring a field--supplied/installed filter

pressure switch or via supply fan runtime hours.

Using switch input: Install the dirty filter pressure switch

according to switch manufacturer’s instructions, to

measure pressure drop across the unit’s return filters.

Connect one side of the switch’s NO contact set to CTB’s

THERMOSTAT--R terminal. Connect the other side of the

NO contact set to TB3--10. Setpoint for Dirty Filter is set

at the switch. See Fig. 52.

TB3

J4-4

Filter Switch (NO, close on rising pressure (high drop))

CTB

Thermostat

C10286

Fig. 52 -- PremierLink Filter Switch Connection

When the filter switch’s NO contact set closes as filter

pressure drop increases (indicating dirt--laden filters), the

input signal to PremierLink causes the filter status point to

read “DIRTY”.

Using Filter Timer Hours: Refer to Form 33CS--67SI for

instructions on using the PremierLink Configuration

screens and on unit alarm sequence.

Supply Fan Status Switch —

The PremierLink control can monitor supply fan operation

through a field--supplied/installed differential pressure

switch. This sequence will prevent (or interrupt) operation

of unit cooling, heating and economizer functions until

the pressure switch contacts are closed indicating proper

supply fan operation.

Install the differential pressure switch in the supply fan

section according to switch manufacturer’s instructions.

Arrange the switch contact to be open on no flow and to

close as pressure rises indicating fan operation.

Connect one side of the switch’s NO contact set to CTB’s

THERMOSTAT--R terminal. Connect the other side of the

NO contact set to TB3--8. Setpoint for Supply Fan Status

is set at the switch. See Fig. 53.

TB3

J4-6

Fan (Pressure) Switch (NO, close on rise in pressure)

CTB

Thermostat

C10287

Fig. 53 -- PremierLink Wiring Fan Pressure Switch

Connection

Remote Occupied Switch —

The PremierLink control permits a remote timeclock to

override the control’s on--board occupancy schedule and

place the unit into Occupied mode. This function may also

provide a “Door Switch” time delay function that will

terminate cooling and heating functions after a 2--20

minute delay.

Connect one side of the NO contact set on the timeclock

to CTB’s THERMOSTAT--R terminal. Connect the other

side of the timeclock contact to the unit’s TB3--2 terminal.

TB3 PL

Time Clock

Remote Occupied LCTB

Thermostat

J4-12

C10288

Fig. 54 -- PremierLink Wiring Remote Occupied

Refer to Form 33CS--67SI for additional information on

configuring the PremierLink control for Door Switch

timer function.

Power Exhaust (output) —

Connect the accessory Power Exhaust contactor coils(s)

per Fig. 55.

J8-3

TB3 PL

PER VIO

BRN

Power Exhaust

CTB

THERMOSTAT

C11158

Fig. 55 -- PremierLink Power Exhaust Output

Connection

NOTE: The Power Exhaust and Humidi--MiZerRoptions

can not be used with PremierLink at the same time as both

options require connection at TB3--15 (AUX OUT).

48HC

CCN Communication Bus —

The PremierLink controller connects to the bus in a daisy

chain arrangement. Negative pins on each component

must be connected to respective negative pins, and

likewise, positive pins on each component must be

connected to respective positive pins. The controller

signal pins must be wired to the signal ground pins.

Wiring connections for CCN must be made at the 3--pin

plug.

At any baud (9600, 19200, 38400 baud), the number of

controllers is limited to 239 devices maximum. Bus length

may not exceed 4000 ft (1219 m), with no more than 60

total devices on any 1000--ft section. Optically isolated

RS--485 repeaters are required every 1000 ft (305 m).

NOTE: Carrier device default is 9600 baud.

Communications Bus Wire Specifications: The CCN

Communication Bus wiring is field--supplied and

field--installed. It consists of shielded 3--conductor cable

with drain (ground) wire. The cable selected must be

identical to the CCN Communication Bus wire used for

the entire network.

See Table 7 for recommended cable.

Table 7 – Recommended Cables

MANUFACTURER CABLE PART NO.

Alpha 2413 or 5463

American A22503

Belden 8772

Columbia 02525

NOTE: Conductors and drain wire must be at least 20

AWG, stranded, and tinned copper. Individual conductors

must be insulated with PVC, PVC/nylon, vinyl, Teflon, or

polyethylene. An aluminum/polyester 100% foil shield

and an outer jacket of PVC, PVC/nylon, chrome vinyl, or

Teflon with a minimum operating temperature range of

-- 2 0 _C(--4_F) to 60_C (140_F) is required. Do not run

communication wire in the same conduit as or next to any

AC voltage wiring.

The communication bus shields must be tied together at

each system element. If the communication bus is entirely

within one building, the resulting continuous shield must

be connected to ground at only one single point. If the

communication bus cable exits from one building and

enters another building, the shields must be connected to

the grounds at a lightning suppressor in each building (one

point only).

Connecting CCN Bus:

NOTE: When connecting the communication bus cable,

a color code system for the entire network is

recommended to simplify installation and checkout. See

Table 8 for the recommended color code.

Table 8 – Color Code Recommendations

SIGNAL TYPE CCN BUS WIRE

COLOR

CCN PLUG PIN

NUMBER

+Red 1

Ground White 2

--- Black 3

Connect the CCN (+) lead (typically RED) to the unit’s

TB3--12 terminal. Connect the CCN (ground) lead

(typically WHT) to the unit’s TB3--14 terminal. Connect

the CCN (--) lead (typically BLK) to the unit’s TB3--16

terminal. See Fig. 56.

CCN Bus

J2-1

J2-2GND (WHT)

TB3

J2-3– (BLK) 16

TB3

TB3 PL

+ (RED)

C10290

Fig. 56 -- PremierLink CCN Bus Connections

48HC

RTU Open Control System

The RTU Open control is factory--mounted in the 48HC

unit’s main control box, to the right of the CTB. See

Fig. 37. Factory wiring is completed through harnesses

connected to the CTB. Field connections for RTU Open

sensors will be made at the Phoenix connectors on the

RTU Open board. The factory--installed RTU Open

control includes the supply--air temperature (SAT) sensor.

The outdoor air temperature (OAT) sensor is included in

the FIOP/accessory EconoMi$er2 package.

The RTU Open controller is an integrated component of the

Carrier rooftop unit. Its internal application programming

provides optimum performance and energy efficiency. RTU

Open enables the unit to run in 100% stand--alone control

mode, Carrier’s I--Vu Open network, or a Third Party

Building Automation System (BAS). On--board DIP

switches allow you to select your protocol (and baud rate) of

choice among the four most popular protocols in use today:

BACnet, Modbus, Johnson N2 and LonWorks. (See Fig. 57.)

Refer to Table 9, RTU Open Controller Inputs and Outputs

for locations of all connections to the RTU Open board.

C10811

Fig. 57 -- RTU Open Multi--Protocol Control Board

48HC

C11142

Fig. 58 -- RTU Open System Control Wiring Diagram

48HC

C11143

Fig. 59 -- RTU Open System Control Wiring Diagram with Humidi--MiZerR

48HC

Table 9 – RTU Open Controller Inputs and Outputs

POINT NAME BACnet OBJECT

NAME TYPE OF I/O CONNECTION PIN

NUMBER(S)

DEDICATED INPUTS

Space Temp / Zone Temp zone_temp AI (10K Thermistor) J 2 0 --- 1 , 2

Supply Air Temperature sa_temp AI (10K Thermistor) J 2 --- 1 , 2

Outdoor Air Temperature oa_temp AI (10K Thermistor) J 2 --- 3 , 4

Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J 2 0 --- 3

Safety Chain Feedback safety_status DI (24 VAC) J 1 --- 9

Compressor Safety Status comp_status DI (24 VAC) J 1 --- 2

Fire Shutdown Status firedown_status DI (24 VAC) J 1 --- 1 0

Enthalpy Status enthalpy_status DI (24 VAC) J 2 --- 6

Humidistat Input Status humstat_status DI (24 VAC) J 5 --- 7

CONFIGURABLE INPUTS

Indoor Air CO2 iaq A I ( 4 --- 2 0 m a )

J 4 --- 2 o r J 4 --- 5Outdoor Air CO2 oaq A I ( 4 --- 2 0 m a )

Space Relative Humidity space_rh A I ( 4 --- 2 0 m a )

Supply Fan Status* sfan_status DI (24 VAC)

J 5 --- 1 o r J 5 --- 3 o r

J55orJ5---7

Filter Status* filter_status DI (24 VAC)

Door Contact Input* door_contact_status DI (24 VAC)

Occupancy Contact* occ_contact_status DI (24 VAC)

OUTPUTS

Economizer Output econ_output A O ( 4 --- 2 0 m a ) J 2 --- 5

SupplyFanRelayState sfan DO Relay (24VAC , 1A) J 1 --- 4

Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J 1 --- 8

Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J 1 --- 7

Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J 1 --- 6

Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J 1 --- 5

Power Exhaust Relay State pexh DO Relay (24VAC , 1A) J 1 1 --- 3

Dehumidification Relay State dehum DO Relay (24VAC, 1A) J 1 1 --- 7 , 8

LEGEND

AI --- An a l o g In p u t

AO --- An a l o g Ou t p u t

DI --- D is cr e t e I n pu t

DO --- Discrete Output

* These inputs (if installed) take the place of the default input on the specific channel according to schematic.

Pa r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0, J 5 --- 5 = J 1 --- 2 a r e u s e d f or f i e l d --- in st a l l a t i o n .

The RTU Open controller requires the use of a Carrier

space sensor. A standard thermostat cannot be used with

the RTU Open system.

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 48HC unit, the unit is supplied with a

supply--air temperature (SAT) sensor (33ZCSENSAT). This

sensor is a tubular probe type, approx 6--inches (12.7 mm) in

length. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied to the

supply--air opening (on the horizontal opening end) in its

shipping position. Remove the sensor for installation.

Re--position the sensor in the flange of the supply--air

opening or in the supply air duct (as required by local

codes). Drill or punch a 1/2--in. hole in the flange or duct.

Use two field--supplied, self--drilling screws to secure the

sensor probe in a horizontal orientation. See Fig. 40.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory--mounted in the EconoMi$er2 (FIOP or

accessory). It is a nominal 10k ohm thermistor attached to

an eyelet mounting ring.

EconoMi$er2 —

The RTU Open control is used with EconoMi$er2 (option

or accessory) for outdoor air management. The damper

position is controlled directly by the RTU Open control;

EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced with

field--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)

Space CO2sensor

Outdoor air CO2sensor

Field Connections

Field connections for accessory sensors and input devices

are made the RTU Open, at plugs J1, J2, J4, J5, J11 and

J20. All field control wiring that connects to the RTU

Open must be routed through the raceway built into the

corner post as shown in Fig. 31. The raceway provides the

UL required clearance between high-- and low--voltage

wiring. Pass the control wires through the hole provided in

the corner post, then feed the wires thorough the raceway

48HC

to the RTU Open. Connect to the wires to the removable

Phoenix connectors and then reconnect the connectors to

the board.

Space Temperature (SPT) Sensors —

There are two types of SPT sensors available from Carrier,

resistive input non-communicating (T55, T56, and T59)

and Rnet communicating (SPS, SPPL, SPP, and SPPF)

sensors. Each type has a variety of options consisting of:

timed override button, set point adjustment, a LCD

screen, and communication tie in. Space temperature can

be also be written to from a building network or zoning

system. However, it is still recommended that return air

duct sensor be installed to allow stand-alone operation for

back-up. Refer to the configuration section for details on

controller configurations associated with space sensors.

S33ZCT55SPT, space temperature sensor with override

button (T--55)

S33ZCT56SPT, space temperature sensor with override

button and setpoint adjustment (T--56)

S33ZCT59SPT, space temperature sensor with LCD

(liquid crystal display) screen, override button, and

setpoint adjustment (T--59)

Use 20 gauge wire to connect the sensor to the controller.

The wire is suitable for distances of up to 500 ft. (152 m).

Use a three--conductor shielded cable for the sensor and

setpoint adjustment connections. If the setpoint

adjustment (slidebar) is not required, then an unshielded,

18 or 20 gauge, two--conductor, twisted pair cable may be

used.

Connect T--55: See Fig. 41 for typical T--55 internal

connections. Connect the T--55 SEN terminals to RTU

Open J20--1 and J20--2. See Fig. 60.

SEN

J20-1

J20-2

C08460

Fig. 60 -- RTU Open T--55 Sensor Connections

Connect T--56: See Fig. 43 for T--56 internal connections.

Install a jumper between SEN and SET terminals as

illustrated. Connect T--56 terminals to RTU Open J20--1,

J20--2 and J20--3 per Fig. 61.

SEN J20-1

J20-2

SEN

SET

Jumper

J20-3

SET

C08461

Fig. 61 -- RTU Open T--56 Sensor Connections

Connect T--59: The T--59 space sensor requires a

separate, isolated power supply of 24 VAC. See Fig. 62

for internal connections at the T--59. Connect the SEN

terminal (BLU) to RTU Open J20--1. Connect the COM

terminal (BRN) to J20--2. Connect the SET terminal (STO

or BLK) to J20--3.

OR SET SEN

OPB COM- PWR+

BLU (SPT)

BLK (STO)

24 VAC

SENSOR

WIRING

POWER

WIRING

BRN (COM)

NOTE: Must use a separate isolated transformer.

J20-3

J20-2

J20-1

C10291

Fig. 62 -- Space Temperature Sensor Typical Wiring

(33ZCT59SPT)

Indoor Air Quality (CO2)Sensor—

The indoor air quality sensor accessory monitors space

carbon dioxide (CO2) levels. This information is used to

monitor IAQ levels. Several types of sensors are available,

for wall mounting in the space or in return duct, with and

without LCD display, and in combination with space

temperature sensors. Sensors use infrared technology to

measure the levels of CO2present in the space air.

The CO2sensors are all factory set for a range of 0 to

2000 ppm and a linear mA output of 4 to 20. Refer to the

instructions supplied with the CO2sensor for electrical

requirements and terminal locations. See Fig. 46 for

typical CO2sensor wiring schematic.

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return--air

grille (if present) so it senses the concentration of CO2

leaving the space. The sensor should be mounted in a

location to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

Wiring the Indoor Air Quality Sensor: For each sensor,

use two 2--conductor 18 AWG (American Wire Gage)

twisted--pair cables (unshielded) to connect the separate

48HC

isolated 24 vac power source to the sensor and to connect

the sensor to the control board terminals.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 46. Connect the 4--20 mA terminal to

RTU Open terminal J4--2 and connect the SIG COM

terminal to RTU Open terminal J4--3. See Fig. 63.

4-20mA

SIG COM

J4-2

J4-3

IAQ Sensor

24 VAC

C10738

Fig. 63 -- RTU Open / Indoor CO2Sensor

(33ZCSENCO2) Connections

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus

weatherproof enclosure) —

The outdoor air CO2sensor is designed to monitor carbon

dioxide (CO2) levels in the outside ventilation air and

interface with the ventilation damper in an HVAC system.

The OAQ sensor is packaged with an outdoor cover. See

Fig. 48. The outdoor air CO2sensor must be located in the

economizer outside air hood.

Wiring the Outdoor Air CO2Sensor: A dedicated

power supply is required for this sensor. A two--wire cable

is required to wire the dedicated power supply for the

sensor. The two wires should be connected to the power

supply and terminals 1 and 2.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 46. Connect the 4 to 20 mA

terminal to RTU Open terminal J4--5. Connect the SIG

COM terminal to RTU Open terminal J4--6. See Fig. 64.

4-20mA

SIG COM

J4-5

J4-6

OAQ Sensor/RH Sensor

24 VAC

C10739

Fig. 64 -- RTU Open / Outdoor CO2Sensor

(33ZCSENCO2) Connections

Space Relative Humidity Sensor or Humidistat —

Humidi--MiZerRControl Wiring: In units equipped

with the Humidi--MiZer option there are two pink (PNK)

wires loose in the control box used to control the

dehumidification function of the unit. These pink wires

are meant to be tied to a space humidistat or thermidistat

on an electromechanical unit. On RTU Open equipped

units these pink wires must be connected to J11--7 & 8 to

allow the Open board to operate the dehumidification

function for the unit. Disconnect the J11 Phoenix style

connector from the board and use the plug screws to

secure the pink wires in pins 7 and 8, reconnect the plug

to the board at J11.

Relative Humidity Sensors (Space or Duct Mounted):

The accessory space humidity sensor (33ZCSENSRH-01)

or duct humidity sensor (33ZCSENDRH-01) is used to

measure the relative humidity of air within the space or

return air duct. The RH reading is used to control the

Humidi--MiZer option of the rooftop unit. For wiring

distances up to 500 ft (152 m), use a 3--conductor, 18 or

20 AWG shielded cable. The shield must be removed

from the sensor end of the cable and grounded at the unit

end. The current loop power for sensor is provided by the

RTU Open controller as 24vdc. Refer to the instructions

supplied with the RH sensor for the electrical

requirements and terminal locations. RTU Open

configurations must be changed after adding an RH

sensor. See Fig. 65 and 66 for typical RH sensor wiring.

SJ4--1 or J4--4 = 24vdc loop power

SJ4--2 or J4--5 = 4--20mA signal input

NOTE: The factory default for dehumidification control

is normally open humidistat.

SW2

12345 6

Io Vin Gnd Vo

MOUNTING

HOLES

WIRING

OPENING

Vin - J4-1 or J4-4 24Vdc

Io - J4-2 or J4-5 -20mA output

C11087

Fig. 65 -- Space Relative Humidity Sensor Typical Wiring

48HC

Relative Humidity Sensor

(Polarized Male Connector)

J4-1 or J4-4 + 24 VDC Supply Voltage

J4-2 or J4-5 (-) 4 to 20 mA Current Loop Output

to RTU-OPEN

4-20 VAC GND 0-5V

mA or or

VDC 0-10V

SPAN

ZERO

C10839

Fig. 66 -- Duct Relative Humidity Sensor Typical Wiring

Humidistat: The accessory humidistat provides the RTU

Open insight to the relative humidity in the space. The

humidistat reads the RH level in the space and compares it

to its setpoint to operate a dry contact. The humidistat is a

dedicated input on the configurable input 9 and tells the

RTU Open when the RH level is HIGH or LOW. The

normal condition for humidity is LOW. A normally open

humidistat is the factory default control for the

Humidi--MiZerRoption.

To wire in the field:

SJ5--8 = 24 VAC source for dry contact

SJ5--7 = Signal input

Smoke Detector/Fire Shutdown (FSD) —

On 48HC units equipped with factory--installed Smoke

Detector(s), the smoke detector controller implements the

unit shutdown through its NC contact set connected to the

unit’s CTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The RTU Open

controller communicates the smoke detector’s tripped status

to the BAS building control. See Figs. 58 and 59, the RTU

Open wiring schematics.

The Fire Shutdown Switch configuration,

→

Config

→

Inputs

→

input 5, identifies the

normally open status of this input when there is no fire

alarm.

Connecting Discrete Inputs —

Filter Status: The filter status accessory is a

field--installed accessory. This accessory detects plugged

filters. When installing this accessory, the unit must be

configured for filter status by setting

→

Config

→

Inputs

→

input3,5,8,or9to Filter

Status and normally open (N/O) or normally closed (N/C).

Input 8 or 9 is recommended for easy of installation. Refer

to Fig. 57 and Fig. 58 or 59 for wire terminations at J5.

Fan Status: The fan status accessory is a field--installed

accessory. This accessory detects when the indoor fan is

blowing air. When installing this accessory, the unit must

be configured for fan status by setting

→

Config

→

Inputs

→

input3,5,8,or9to Fan

Status and normally open (N/O) or normally closed (N/C).

Input 8 or 9 is recommended for easy of installation. Refer

to Fig. 57 and Fig. 58 or 59 for wire terminations at J5.

Remote Occupancy: The remote occupancy accessory is

a field--installed accessory. This accessory overrides the

unoccupied mode and puts the unit in occupied mode.

When installing this accessory, the unit must be

configured for remote occupancy by setting

→

Config

→

Inputs

→

input3,5,8,or9to Remote

Occupancy and normally open (N/O) or normally closed

(N/C).

Also set MENU

→

Schedules

→

occupancy source to DI

on/off. Input 8 or 9 is recommended for easy of

installation. Refer to Fig. 57 and Table 9 for wire

terminations at J5.

Power Exhaust (output): The relay used by the RTU

Open board to control power exhaust is a dry contact

which means it does not have 24vac. This 24vac must be

connected to the relay to allow it to operate the power

exhaust relay in the PE accessory. A 24vac source must be

provided to J11--2 on the RTU Open control board. This

can be provided by the unit’s transformer from various

sources. The “R” terminal on the unit’s low voltage

terminal board (LVTB) is a logical source. Refer to Fig.

57 and Fig. 58 or 59 for wire terminations at J11.

48HC

Communication Wiring -- Protocols

General —

Protocols are the communication languages spoken by

control devices. The main purpose of a protocol is to

communicate information in the most efficient method

possible. Different protocols exist to provide different

kinds of information for different applications. In the BAS

application, many different protocols are used, depending

on manufacturer. Protocols do not change the function of

a controller; just make the front end user different.

The RTU Open can be set to communicate on four

different protocols: BACnet, Modbus, N2, and LonWorks.

Switch 3 (SW3) on the board is used to set protocol and

baud rate. Switches 1 and 2 (SW1 and SW2) are used to

set the board’s network address. See Fig. 67 and 68 for

protocol switch settings and address switches. The 3rd

party connection to the RTU Open is through plug J19.

See Fig. 69 for wiring.

NOTE: Power must be cycled after changing the SW1--3

switch settings.

Refer to the RTU Open Controller Integration Guide

(Catalog No. 11--808--428--01) for more detailed information

on protocols, 3rd party wiring, and networking.

SW3 Protocol Selection

PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1

BACnet MS/TP

(Master) Unused OFF OFF OFF ON OFF Select Baud Select Baud

Modbus

(Slave) Unused OFF OFF ON ON OFF Select Baud Select Baud

(Slave) Unused OFF OFF OFF ON ON OFF OFF

LonWorks Unused ON ON OFF ON OFF OFF OFF

NOTE:

DS = Dip Switch

BACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE DS2 DS1

9600 OFF OFF

19,200 ON OFF

38,400 OFF ON

76,800 ON ON C07166

Fig. 67 -- RTU Open SW3 Dip Switch Settings

C10815

Fig. 68 -- RTU Open Address Switches

C10816

Fig. 69 -- Network Wiring

48HC

Local Access —

BACview6Handheld: The BACview6is a keypad/display

interface used to connect to the RTU Open to access the

control information, read sensor values, and test the RTU,

see Fig. 70. This is an accessory interface that does not

come with the RTU Open controller and can only be used

at the unit. Connect the BACview6to the RTU Open J12

local access port. There are 2 password protected levels in

the display (User and Admin). The user password is

defaulted to 0000 but can be changed. The Admin

password is 1111 and cannot be changed. There is a 10

minute auto logout if a screen is idle. See Form

48--50HCTQ--01T, Appendix A for navigation and screen

content.

Virtual BACview: Virtual BACview is a freeware computer

program that functions as the BACview6Handheld. The

USB Link interface (USB--L) is required to connect a

computer to the RTU Open board. The link cable connects

a USB port to the J12 local access port. This program

functions and operates identical to the handheld.

RTU Open Troubleshooting —

Communication LEDs: The LEDs indicate if the

controller is speaking to the devices on the network. The

LEDs should reflect communication traffic based on the

baud rate set. The higher the baud rate the more solid the

LEDs will appear. See Table 10.

Cable

Access Port

J12

P1 P1

P5 P5

RTU Open

BACview6 Local Access Cable

Protocol Selector

C10812

Fig. 70 -- BACview6Handheld Connections

48HC

Table 10 – LEDs

The LEDs on the RTU Open Control Board (see Fig. 57) show the status of certain functions:

If this LED is on... Status is...

Power RTU Open has power

Rx RTU Open is receiving data from the network segment

Tx RTU Open is transmitting data over the network segment

DO# The digital output is active

The Run and Error LEDs indicate control module and network status

If Run LED shows... And Error LED shows... Status is...

2 flashes per second Off Normal

2 flashes per second 2flashes,

alternating with Run LED Five minute auto---restart delay after system error

2 flashes per second 3flashes,

then off Control module has just been formatted

2 flashes per second 4flashes,

then pause

Two or more devices on this network have the

same ARC156 network address

2 flashes per second On Exec halted after frequent system errors or

control programs halted

5 flashes per second On Exec start---up aborted, Boot is running

5 flashes per second Off Firmware transfer in progress, Boot is running

7 flashes per second 7 flashes per second, alternating with

Run LED Ten second recovery period after brownout

14 flashes per second 14 flashes per second,

alternating with Run LED Brownout

On On

Failure. Try the following solutions:

STurnRTUOpenoff,thenon.

SFormat RTU Open.

SDownload memory to RTU Open.

SReplace RTU Open.

NOTE: Refer to Catalog No. 48--50HCTQ--01T for

complete configuration of RTU Open, operating sequences

and troubleshooting information. Refer to RTU Open

Controller Integration Guide (Catalog No. 11--808--428--01)

for details on configuration and troubleshooting of connected

networks. Have a copy of these manuals available at unit

start--up.

Outdoor Air Enthalpy Control

(PNO 33CSENTHSW)

The enthalpy control (33CSENTHSW) is available as a

field--installed accessory to be used with the EconoMi$er2

damper system. The outdoor air enthalpy sensor is part of

the enthalpy control. (The separate field--installed

accessory return air enthalpy sensor (33CSENTSEN) is

required for differential enthalpy control. See Fig. 71.)

Locate the enthalpy control in the economizer next to the

Actuator Motor. Locate two GRA leads in the factory

harness and connect the gray lead labeled “ESL” to the

terminal labeled “LOW”. See Fig. 71. Connect the

enthalpy control power input terminals to economizer

actuator power leads RED (connect to 24V) and BLK

(connect to GND).

7CTB ECON

(P’LINK: to J4-2) or

(RTU Open: to J2-6)

LOW

GND

24V

Enthalpy

Switch

GRA

BLK

RED

Factory Wiring Harness

PL6-1 (24-V)

PL6-4 (COM)

C11160

Fig. 71 -- Enthalpy Switch (33CSENTHSW) Connections

The outdoor enthalpy changeover setpoint is set at the

enthalpy controller.

Differential Enthalpy Control —

Differential enthalpy control is provided by sensing and

comparing the outside air and return air enthalpy

conditions. Install the outdoor air enthalpy control as

described above. Add and install a return air enthalpy

sensor (see Fig. 72).

48HC

GRA

BLK

RED

– 4-20

Main

+ VDC

Out

– 4-20 Main

Out

+ 24-36

VDC In

LOW

GND

24V

PL6-1 (24-V)

PL6-4 (COM)

Outside Air

Enthalpy Switch

Return Air

Enthalpy

Sensor

CTB ECON

(P’LINK: to J4-2) or

(RTU Open: to J2-6)

C11161

Fig. 72 -- Outside and Return Air Enthalpy Sensor

Wiring

To wire the return air enthalpy sensor, perform the

following:

1. Use a 2--conductor, 18 or 20 AWG, twisted pair cable

to connect the return air enthalpy sensor to the enthal-

py controller.

2. Connect the field--supplied RED wire to (+) spade

connector on the return air enthalpy sensor and the

(+) terminal on the enthalpy controller. Connect the

BLK wire to (--) spade connector on the return air en-

thalpy sensor and the (--) terminal on the enthalpy

controller.

Smoke Detectors

Smoke detectors are available as factory--installed options

on 48HC models. Smoke detectors may be specified for

Supply Air only or for Return Air without or with

economizer or in combination of Supply Air and Return

Air. Return Air smoke detectors are arranged for vertical

return configurations only. The unit is factory--configured

for immediate smoke detector shutdown operation;

additional wiring or modifications to unit terminal board

may be necessary to complete the unit and smoke detector

configuration to meet project requirements.

Return Air Sensor Tube Installation –

The return air sampling tube is shipped in the units

supply fan section, attached to the blower housing (see

Fig. 73. Its operating location is in the return air section

of the unit (see Fig. 74, unit without economizer, or

Fig. 75, unit with economizer), inserted into the return air

sensor module housing which protrudes through the back

of the control box.

ROTATION

Return Air Sampling Tube

(Shipping Location)

C09102

Fig. 73 -- Typical Supply Air Smoke Detector Sensor

Location

Return Air Detector

Sampling Tube

C09135

Fig. 74 -- Return Air Sampling Tube Location

in Unit without Economizer

Return Air Detector

Sampling Tube

C09136

Fig. 75 -- Return Air Sampling Tube Location

in Unit with Economizer

48HC

To install the return air sensor sampling tube:

1. Remove the tube from its shipping location.

2. Open the unit end to access the return air sensor (loc-

ated on right--hand partition)

3. Orient the tube’s sampling holes into the return air

flow direction. For vertical application, position the

sampling holes on the bottom of the tube, facing into

the bottom return duct opening. For horizontal applic-

ation, position the sampling holes on the side of the

tube, facing the unit’s end panel.

4. Insert the sampling tube into the return air sensor

module until the tube snaps into position.

5. Replace end panel or outside air hood.

Smoke Detector Test Magnet —

Locate the magnet; it is shipped in the control box area.

Additional Application Data —

Refer to Catalog No. HKRNKA--1XA for discussions on

additional control features of these smoke detectors

including multiple unit coordination.

Table 11 – Unit Wire/Fuse or HACR Breaker Sizing Data

UNIT

NOM.

V --- P h --- H z

IFM

TYPE

COMBUSTION

FAN MOTOR

POWER

EXHAUST NO C.O. or UNPWR C.O.

FLA FLA

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA

FUSE or

HACR

BRKR

DISC. SIZE

MCA

FUSE or

HACR

BRKR

DISC. SIZE

FLA LRA FLA LRA

48HC*D17

208/230---3 ---60

STD

0.52 5.9

68.3 90.0 71 393 80.1 100.0 85 413

MED 71.0 90.0 74 410 82.8 100.0 88 430

HIGH 75.8 100.0 80 419 87.6 100.0 93 439

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

34.9 45.0 36 234 41.1 50.0 44 246

MED 36.3 45.0 38 243 42.5 50.0 45 255

HIGH 38.9 50.0 41 247 45.1 50.0 48 259

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

26.2 30.0 27 184 31.0 40.0 33 192

MED 26.2 30.0 27 184 31.0 40.0 33 192

HIGH 29 35 31 198 33.8 40 36 206

48HC*D20

208/230---3 ---60

STD

0.52 5.9

75.7 100 79 440 87.5 100 93 460

MED 80.5 100 85 449 92.3 100 98 469

HIGH 85.9 100 91 459 97.7 125 104 479

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

36.6 45 38 245 42.8 50 46 257

MED 39.2 50 41 249 45.4 50 49 261

HIGH 42 50 45 254 48.2 60 52 266

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

26.2 30 27 186 31 40 33 194

MED 29 35 31 200 33.8 40 36 208

HIGH 32.4 40 35 198 37.2 45 40 206

48HC*D24

208/230---3 ---60

STD

0.52 5.9

88.7 100.0 93 544 100.5 125.0 107 564

MED 94.1 110 100 554 105.9 125 113 574

HIGH 107.6 125 114 628 119.4 150 128 648

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

48.6 60.0 51 277 54.8 60.0 58 289

MED 51.4 60 54 282 57.6 70 61 294

HIGH 57.4 70 61 319 63.6 80 68 331

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

35.5 45.0 37 204 40.3 50.0 43 212

MED 38.9 50 41 202 43.7 50 47 210

HIGH 39.4 50 42 229 44.2 50 47 237

48HC*D28

208/230---3 ---60

STD

0.52 5.9

117.4 150.0 121 584 129.2 175.0 135 604

MED 122.8 150 127 594 134.6 175 141 614

HIGH 135.5 175 142 668 147.3 175 156 688

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

54.0 60.0 57 303 60.2 70.0 64 315

MED 56.8 70 60 308 63 80 67 320

HIGH 62.8 80 67 345 69 80 74 357

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

40.4 50.0 42 228 45.2 50.0 48 236

MED 43.8 50 46 226 48.6 60 52 234

HIGH 44.3 50 47 253 49.1 60 52 261

NOTE: See page 49 for table legend and notes.

48HC

Table 11 -- Unit Wire/Fuse or HACR Breaker Sizing Data (cont)

UNIT

NOM.

V --- P h --- H z

IFM

TYPE

COMBUSTION

FAN MOTOR

POWER

EXHAUST

w/ PWRD C.O.

NO P.E. w/ P.E. (pwrd fr/ unit)

FLA FLA MCA

FUSE or

HACR

BRKR

DISC. SIZE

MCA

FUSE or

HACR

BRKR

DISC. SIZE

FLA LRA FLA LRA

48HC*D17

208/230---3 ---60

STD

0.52 5.9

73.1 90.0 77 398 84.9 100.0 90 418

MED 75.8 100.0 80 415 87.6 100.0 93 435

HIGH 80.6 100.0 85 424 92.4 100.0 99 444

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

37.1 45.0 39 236 43.3 50.0 46 248

MED 38.5 50.0 41 245 44.7 50.0 48 257

HIGH 41.1 50.0 44 249 47.3 60.0 51 261

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

27.9 35.0 29 186 32.7 40.0 35 194

MED 27.9 35.0 29 186 32.7 40.0 35 194

HIGH 30.7 40.0 33 200 35.5 45.0 38 208

48HC*D20

208/230---3 ---60

STD

0.52 5.9

80.5 100 85 445 92.3 100 98 465

MED 85.3 100 90 454 97.1 110 104 474

HIGH 90.7 100 96 464 102.5 125 110 484

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

38.8 50 41 247 45 50 48 259

MED 41.4 50 44 251 47.6 60 51 263

HIGH 44.2 50 47 256 50.4 60 54 268

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

27.9 35 29 188 32.7 40 35 196

MED 30.7 40 33 202 35.5 45 38 210

HIGH 34.1 40 36 200 38.9 45 42 208

48HC*D24

208/230---3 ---60

STD

0.52 5.9

93.5 110.0 99 549 105.3 125.0 112 569

MED 98.9 125 105 559 110.7 125 119 579

HIGH 112.4 125 120 633 124.2 150 133 653

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

50.8 60.0 54 279 57.0 70.0 61 291

MED 53.6 60 57 284 59.8 70 64 296

HIGH 59.6 70 64 321 65.8 80 71 333

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

37.2 45.0 39 206 42.0 50.0 45 214

MED 40.6 50 43 204 45.4 50 49 212

HIGH 41.1 50 44 231 45.9 50 49 239

48HC*D28

208/230---3 ---60

STD

0.52 5.9

122.2 150.0 127 589 134.0 175.0 140 609

MED 127.6 175 133 599 139.4 175 147 619

HIGH 140.3 175 148 673 152.1 200 161 693

4 6 0 --- 3 --- 6 0

STD

0.3 3.1

56.2 70.0 59 305 62.4 80.0 66 317

MED 59 70 62 310 65.2 80 70 322

HIGH 65 80 69 347 71.2 80 76 359

5 7 5 --- 3 --- 6 0

STD

0.24 2.4

42.1 50.0 44 230 46.9 60.0 50 238

MED 45.5 60 48 228 50.3 60 54 236

HIGH 46 60 49 255 50.8 60 54 263

NOTE: See page 49 for table legend and notes.

48HC

Legend and Notes for Table 11

LEGEND:

BRKR --- Circuit breaker

CO --- Convenience outlet

DISC --- Disconnect

FLA --- Full load amps

LRA --- Locked rotor amps

MCA --- Minimum circuit amps

P E --- P o w e r e x h a u s t

PWRD CO --- Powered convenient outlet

UNPWR CO --- Unpowered convenient outlet

NOTES:

1. In compliance with NEC requirements for multimotor and

combination load equipment (refer to NEC Articles 430 and

440), the overcurrent protective device for the unit shall be

fuse or HACR breaker. Canadian units may be fuse or circuit

breaker.

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply

voltage is greater than 2%. Use the following formula to de-

termine the percentage of voltage imbalance.

% Voltage Imbalance = 100 x

max voltage deviation from average voltage

average voltage

Example: Supply voltage is 230-3-60

AB = 224 v

BC = 231 v

AC = 226 v

Average Voltage = (224 + 231 + 226) =681

= 227

Determine maximum deviation from average voltage.

(AB) 227 – 224 = 3 v

(BC) 231 – 227 = 4 v

(AC) 227 – 226 = 1 v

Maximum deviation is 4 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x 4

227

= 1.76%

This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than

2%, contact your local electric utility company immediately.

48HC

Economizer 2 Position Damper Unit Without Economizer or

2 Position Damper

C10645

Fig. 76 -- EconoMi$ertIV Wiring

Step 13 — Adjust Factory--Installed Options

EconoMi$er IV Occupancy Switch —

Refer to Fig. 76 for general EconoMi$er IV wiring.

External occupancy control is managed through a

connection on the Central Terminal Board.

If external occupancy control is desired, connect a time

clock or remotely controlled switch (closed for Occupied,

open for Unoccupied sequence) at terminals marked

OCCUPANCY on CTB. Remove or cut jumper JMP 2 to

complete the installation.

Step 14 — Install Accessories

Available accessories include:

Roof Curb

Thru--base connection kit (must be installed before unit

is set on curb)

LP conversion kit

Manual outside air damper

High Altitude Gas kits

Low Ambient Controls

Thermostat / Sensors

Two--Position motorized outside air damper

EconoMi$er2 (without control/for external signal and

integrated barometric relief)

EconoMi$er IV (with control and integrated barometric

relief)

Power Exhaust

Differential dry--bulb sensor (EconoMi$er IV)

Outdoor enthalpy sensor

Differential enthalpy sensor

CO2sensor

DDC interface (PremierLink)

Louvered hail guard

Phase monitor control

Winter Start kit

Refer to separate installation instructions for information

on installing these accessories.

Pre--Start and Start--Up

This completes the mechanical installation of the unit.

Refer to the unit’s Service and Maintenance manual for

detailed Pre--Start and Start--up instructions.

48HC

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: 48HC---11SI

Replaces: 48HC--- 08SI

48HC

Carrier Single Package Rooftop 48Hc Users Manual 11SI

48HC to the manual 565459b0-f448-4b15-af4f-85e23d413a65

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