Carrier Single Package Rooftop Units Electric Cooling Gas Heating 48Hj015 025 Users Manual

48HJ015-025 to the manual 88791006-9120-4aeb-863e-83f5c7ef6fb1

2015-01-24

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Installation Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS ...................1

INSTALLATION .............................1-12

Step 1 — Provide Unit Support ...............1

• ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit ..................3

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork ............7

Step 4 — Make Unit Duct Connections ........7

Step 5 — Install Flue Hood ...................7

Step6—TrapCondensate Drain .............8

Step 7 — Install Gas Piping ...................8

Step 8 — Make Electrical Connections ........9

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

Step 9 — Make Outdoor-Air Inlet

Adjustments ...............................10

• MANUAL OUTDOOR-AIR DAMPER

• OPTIONAL FACTORY-INSTALLED

ECONOMIZER

Step 10 — Install Outdoor-Air Hood ..........10

START-UP ................................12-17

SERVICE ..................................18-27

START-UP CHECKLIST .....................CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment

can be hazardous due to system pressure and electrical com-

ponents. Only trained and qualiﬁed service personnel should

install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance

functions of cleaning coils and ﬁlters and replacing ﬁlters.

All other operations should be performed by trained service

personnel. When working on air-conditioning equipment, ob-

serve precautions in the literature, tags and labels attached

to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves.

Use quenching cloth for unbrazing operations. Have ﬁre ex-

tinguishers available for all brazing operations.

Before performing service or maintenance operations on

unit, turn off main power switch to unit. Electrical shock

could cause personal injury.

1. Improper installation, adjustment, alteration, serv-

ice, or maintenance can cause property damage, per-

sonal injury, or loss of life. Refer to the User’s In-

formation Manual provided with this unit for more

details.

2. Do not store or use gasoline or other ﬂammable va-

pors and liquids in the vicinity of this or any other

appliance.

What to do if you smell gas:

1. DO NOT try to light any appliance.

2. DO NOT touch any electrical switch, or use any phone

in your building.

3. IMMEDIATELY call your gas supplier from a neigh-

bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the ﬁre

department.

Disconnect gas piping from unit when pressure testing

at pressure greater than 0.5 psig. Pressures greater than

0.5 psig will cause gas valve damage resulting in haz-

ardous condition. If gas valve is subjected to pressure

greater than 0.5 psig, it must be replaced before use. When

pressure testing ﬁeld-supplied gas piping at pressures of

0.5 psig or less, a unit connected to such piping must be

isolated by closing the manual gas valve(s).

INSTALLATION

Step 1 — Provide Unit Support

ROOF CURB — Assemble or install accessory roof curb in

accordance with instructions shipped with this accessory. See

Fig. 1 and 2. Install insulation, cant strips, rooﬁng, and counter

ﬂashing as shown. Ductwork can be installed to roof curb

before unit is set in place. Curb should be level. This is nec-

essary to permit unit drain to function properly. Unit level-

ing tolerance is ±

⁄

in. per linear ft in any direction. Refer

to Accessory Roof Curb Installation Instructions for addi-

tional information as required. When accessory roof curb is

used, unit may be installed on class A, B, or C roof covering

material.

IMPORTANT: The gasketing of the unit to the roof

curb is critical for a watertight seal. Install gasket with

the roof curb as shown in Fig. 1. Improperly applied

gasket can also result in air leaks and poor unit

performance.

Instructions continued on page 3.

48HJ015-025

Single Package Rooftop Units

Electric Cooling/Gas Heating

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

Book 1

Tab 1a

PC 111 Catalog No. 534-807 Printed in U.S.A. Form 48HJ-9SI Pg 1 2-95 Replaces: 48HJ-5SI

ACCESSORY

PACKAGE NO. CURB

HEIGHT DESCRIPTION ‘‘A’’ ‘‘B’’ ‘‘C’’

50PQ900221 18-29

(305) Standard Curb —

149High ———

50PQ900141 28-09

(610)

Standard Curb

for Units Requiring

High Installation ———

50PQ900151 28-09

(610) Horizontal Supply

and Return Curb 58-69

(1676) 08-2

⁄

(64) 18-69

(457)

50DP900211 18-119

(584)

Pre-Assembled,

High-Static,

Horizontal Adapter

68-29

(1880) 08-6

⁄

(159) 18-2

⁄

(371)

LEGEND

COMP SECT. — Compressor Section

NOTES:

1. Roof curb accessory is shipped unassembled.

2. Insulated panels,

⁄

-in. thick neoprene-coated, 2 lb density.

3. Dimensions in ( ) are in millimeters.

4. Direction of airﬂow.

5. Roof curb: 18 gage steel.

6. Attach all ductwork to roof curb.

7. Field installation of sidewall is mandatory.

NOTE: To prevent the hazard of stagnant water build-up in the drain

pan of the indoor-air section, unit can only be pitched as shown.

Fig. 1 — Roof Curb and Horizontal Adapter Details

ALTERNATE UNIT SUPPORT — When the curb cannot

be used, install unit on a noncombustible surface. Support

unit with sleepers, using unit curb support area. If sleepers

cannot be used, support long sides of unit with a minimum

of 3 equally spaced 4-in. x 4-in. pads on each side.

Step 2 — Rig and Place Unit — Inspect unit for trans-

portation damage. File any claim with transportation agency.

Do not drop unit; keep upright. Use spreader bars over

unit to prevent sling or cable damage. Rollers may be used

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

reference; leveling tolerance is ±

⁄

in. per linear ft in any

direction. See Fig. 3 for additional information. Unit oper-

ating weight is shown in Table 1.

Four lifting holes are provided in ends of unit base rails

as shown in Fig. 3. Refer to rigging instructions on unit.

POSITIONING — Maintain clearance, per Fig. 4 and 5, around

and above unit to provide minimum distance from combus-

tible materials, proper airﬂow, and service access.

Do not install unit in an indoor location. Do not locate

unit air inlets near exhaust vents or other sources of con-

taminated air. For proper unit operation, adequate combus-

tion 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).

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

Locate mechanical draft system ﬂue assembly at least

4 ft from any opening through which combustion products

could enter the building, and at least 4 ft from any adjacent

building. When unit is located adjacent to public walkways,

ﬂue assembly must be at least 7 ft above grade.

ROOF MOUNT — Check building codes for weight distri-

bution requirements. Unit weight is shown in Table 1.

Instructions continued on page 7.

UNIT

48HJ

MAXIMUM SHIPPING

WEIGHT

Lb Kg

D015 1920 871

E015 1940 880

E017 2310 1048

D025 2535 1150

Dimension A

UNIT Ft-in. mm

48HJD015 3-1

⁄

949

48HJE015 3-1

⁄

946

48HJE017 3-4

⁄

1035

48HJD025 3-4

⁄

1010

NOTES:

1. Dimensions in ( ) are in millimeters.

2. Refer to Table 1 for unit operating weights.

3. Remove boards at ends of unit and runners prior to rigging.

4. Rig by inserting hooks into unit base rails as shown. Use corner

post from packaging to protect coil from damage. Use bumper boards

for spreader bars.

5. Weights do not include optional economizer. See Table 1 for econo-

mizer weight.

6. Weights given are for aluminum evaporator coil plate ﬁns and cop-

per condenser coil plate ﬁns. Weights of other metal combinations

are listed in Table 1.

All panels must be in place when rigging.

Fig. 3 — Rigging Details

Fig. 2 — Horizontal Supply/Return Curb

and Horizontal Adapter Details

Table 1 — Physical Data

UNIT SIZE 48 HJD015/HJE015 HJE017 HJD025

208/230, 460 V 575 V

OPERATING WT (lb)

Al/Al* 1640/1660 2010 2235

Unit Al/Cu* 1770/1790 2160 2385

Cu/Cu* 1840/1860 2250 2515

Economizer 110 110 110

Roof Curb† 200 200 200

COMPRESSOR 06D Semi-Hermetic

Number 122

Cylinders 646

REFRIGERANT TYPE R-22

Charge (lb)

System 1 22.50 14.25 17.50

System 2 — 15.00 17.00

CONDENSER COIL Copper Tubes, Aluminum or Copper Plate Fins

Rows 344

Fins/in. 15 15 15

Total Face Area (sq ft) 22.2 22.2 22.2

CONDENSER FAN Propeller Type, Direct Drive

Nominal Cfm 10,500 10,500 14,200

Number...Diameter (in.) 3...22 3...22 2...30

Motor Hp (1075 Rpm)

⁄

1...1075

Watts Input (Total) 1090 1090 3400

EVAPORATOR COIL Copper Tubes, Aluminum or Copper Plate Fins

Rows 234

Fins/in. 17 15 15

Total Face Area (sq ft) 17.9 17.9 17.9

EVAPORATOR FAN Centrifugal, Adjustable Pitch Belt Drive

Quantity...Size (in.) 2...10 x 10 2...10 x 10 2...12 x 12 2...12 x12

Nominal Cfm 5000 5000 6000 8000

Fan Rpm Range 1194-1526 1201-1462 1238-1494 1323-1579

Maximum Allowable Rpm 1550 1550 1550 1550

Motor Pulley Pitch Diameter (in.) 3.4/4.4 4.3/5.3 5.4/6.6 5.8/7.0

Fan Pulley Pitch Diameter (in.) 5.2 6.4 7.9 7.9

Belt, Quantity...Type...Length (in.) 1...AX...42 1...B...45 1...BX...50 1...BX...51

Factory Speed Setting (Rpm) 1293 1279 1366 1451

Motor Hp (Service Factor) 3.7 (1.15) 3 (1.15) 5 (1.15) 10 (1.15)

Motor Frame Size 56H 56H 184T 215T

FURNACE SECTION

Rollout Switch Cutout Temp (F)** 190 190 190

Burner Oriﬁce Diameter (in. ...drill size)

Natural Gas .113...33 .113...33 .113...33

Pilot Oriﬁce Diameter (Quantity) in. ...drill size

Natural Gas

(1) .055...54/

(1) .055...54

(1) .041...59

(1) .055...54

(1) .041...59 (1) .055...54

(1) .041...59

Thermostat Heat Anticipator Setting

Stage 1

Stage 2 1.2/1.2

—/0.6 1.2

0.6 1.2

0.6

Gas Valve Quantity 1/2 2 2

HIGH-PRESSURE SWITCH

Cutout (psig) 426

Reset (psig) 320

LOW-PRESSURE SWITCH

Cutout (psig) 7

Reset (psig) 22

AIR INLET SCREENS Cleanable

Economizer, Quantity...Size (in.) 2...20 x 25 x 1

1...20 x 20 x 1

RETURN-AIR FILTERS (TYPE) 10% Efficient — 2-in. Throwaway Fiberglass

Quantity... Size (in.) 4...20 x 20 x 2

4...16 x 20 x 2

LEGEND

Al — Aluminum

Cu — Copper

*Evaporator coil ﬁn material/condenser coil ﬁn material.

†Weight of 14 in. roof curb.

**Rollout switch is manual reset.

UNIT

48HJ MAXIMUM SHIPPING WEIGHT

Lb Kg

D015 1920 871

E015 1940 880

E017 2310 1048

UNIT

48HJ

DIMENSIONS

Ft-in. mm Ft-in. mm

D015 3-2 965 4-0 1219

E015 3-2 965 4-0 1219

E017 3-7

⁄

1102 3-6

⁄

1083

UNIT

48HJ

WEIGHT OF CORNER*

ABCD

Lb Kg Lb Kg Lb Kg Lb Kg

D015 365 166 360 163 373 169 540 245

E015 372 169 363 165 377 171 547 248

E017 509 231 506 230 475 216 519 235

*Weights are for unit only and do not include options or crating.

NOTES:

1. Dimensions in ( ) are in millimeters.

2. Center of gravity.

3. Direction of airﬂow.

4. Ductwork to be attached to accessory roof curb only.

5. Minimum clearance:

a. Rear: 78-09(2134) for coil removal. This dimension can be reduced

to 48-09(1219) if conditions permit coil removal from the top.

b. Left side: 48-09(1219) for proper condenser coil airﬂow.

c. Front: 48-09(1219) for control box access.

d. Right side: 48-09(1219) for proper operation of damper and power

exhaust (if so equipped).

e. Top: 68-09(1829) to assure proper condenser fan operation.

f. Local codes or jurisdiction may prevail.

6. With the exception of clearance for the condenser coil and the damper/

power exhaust as stated in Note No. 5, a removable fence or barri-

cade requires no clearance.

7. Dimensions are from outside of corner post. Allow 08-

⁄

9(8) on each

side for top cover drip edge.

Fig. 4 — Base Unit Dimensions, 48HJ015,017

MAXIMUM SHIPPING WEIGHT

Lb Kg

2535 1150

NOTES:

1. Dimensions in ( ) are in millimeters.

2. Center of gravity.

3. Direction of airﬂow.

4. Ductwork to be attached to accessory roof curb only.

5. Minimum clearance:

a. Rear: 7809(2134) for coil removal. This dimen-

sion can be reduced to 4809(1219) if conditions

permit coil removal from the top.

b. 4809(1219) to combustible surfaces, all four sides

(includes between units).

c. Left side: 4809(1219) for proper condenser coil

airﬂow.

d. Front: 4809(1219) for control box access.

e. Right side: 4809(1219) for proper operation of

damper and power exhaust (if so equipped).

f. Top: 6809(1829) to assure proper condenser fan

operation.

g. Bottom: 149(356) to combustible surfaces (when

not using curb).

h. Control box side: 3809(914) to ungrounded sur-

faces (non-combustible).

i. Control box side: 3869(1067) to block or concrete

walls, or other grounded surfaces.

j. Local codes or jurisdiction may prevail.

6. With the exception of clearance for the condenser

coil and the damper/power exhaust as stated in Note

No. 5, a removable fence or barricade requires no

clearance.

7. Dimensions are from outside of corner post. Allow

08-

⁄

9(8) on each side for top cover drip edge.

CORNER WEIGHT*

ABCD

Lb Kg Lb Kg Lb Kg Lb Kg

523 237 541 245 574 260 596 270

*Weights are for unit only and do not include options or crating.

Fig. 5 — Base Unit Dimensions, 48HJ025

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use ﬂexible duct connectors be-

tween unit and ducts as required. Insulate and weatherproof

all external ductwork, joints, and roof openings with counter

ﬂashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be

insulated and covered with a vapor barrier.

Step 4 — Make Unit Duct Connections — Unit

is shipped for through-the-bottom duct connections. Duct-

work openings are shown in Fig. 1, 4, and 5. Duct connec-

tions are shown in Fig. 6. Field-fabricated concentric duct-

work may be connected as shown in Fig. 7 and 8. Attach all

ductwork to roof curb and roof curb basepans.

Step 5 — Install Flue Hood — Flue hood is shipped

secured to a baffle under main control box. To install, secure

ﬂue hood to access panel. See Fig. 9.

NOTE: When properly installed, ﬂue hood will line up with

combustion fan housing. See Fig. 10.

NOTE: Do not drill in this area; damage to basepan may result in

water leak.

Fig. 6 — Air Distribution — Through-the-Bottom

(48HJ017 and 025 Shown)

NOTE: Do not drill in this area; damage to basepan may result in

water leak.

Fig. 7 — Concentric Duct Air Distribution

(48HJ017 and 025 Shown)

NOTE: Dimensions A, A8, B, and B8are obtained from ﬁeld-supplied

ceiling diffuser.

areas indicate block-off pans.

Fig. 8 — Concentric Duct Details

Fig. 9 — Flue Hood Location

Step6—TrapCondensate Drain — See Fig. 11

for drain location. One

⁄

-in. half coupling is provided

inside unit evaporator section for condensate drain connec-

tion. An 8

⁄

in. x

⁄

-in. diameter and 2-in. x

⁄

-in. diameter

pipe nipple, coupled to standard

⁄

-in. diameter elbows, pro-

vides a straight path down through hole in unit base rail (see

Fig. 12). A trap at least 4-in. deep must be used.

Step 7 — Install Gas Piping — Unit is equipped for

use with natural gas. Installation must conform with local

building codes or, in the absence of local codes, with the

National Fuel Gas Code, ANSI Z223.1.

Install manual gas shutoff valve with a

⁄

-in. NPT pres-

sure tap for test gage connection at unit. Field gas piping

must include sediment trap and union. See Fig. 13.

Do not pressure test gas supply while connected to unit.

Always disconnect union before servicing.

Natural gas pressure at unit gas connection must not be

less than 5 in. wg or greater than 13.5 in. wg.

Size gas-supply piping for 0.5-in. wg maximum pressure

drop. Do not use supply pipe smaller than unit gas connec-

tion (

⁄

-in. NPT).

PRESSURE

SWITCH

COMBUSTION

FAN HOUSING

HEAT

EXCHANGER

SECTION

Fig. 10 — Combustion Fan Housing Location

3/4" FPT DRAIN

CONNECTION 1-3/8"

DRAIN HOLE

Fig. 11 — Condensate Drain Details

Fig. 12 — Condensate Drain Piping Details

Fig. 13 — Field Gas Piping

Step 8 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factory wired for volt-

age shown on unit nameplate.

When installing units, provide a disconnect per NEC

(National Electrical Code) of adequate size (Table 2).

All ﬁeld wiring must comply with NEC and local

requirements.

Route power and ground lines through control box end

panel or unit basepan (see Fig. 4 and 5) to connections as

shown on unit wiring diagram and Fig. 14.

The unit must be electrically grounded in accordance

with local codes and NEC ANSI/NFPA 70 (National Fire

Protection Association).

Field wiring must conform to temperature limitations for

type ‘‘T’’ wire. All ﬁeld wiring must comply with NEC and

local requirements.

Transformer no. 1 is wired for 230-v unit. If 208/230-v

unit is to be run with 208-v power supply, the transformer

must be rewired as follows:

1. Remove cap from red (208 v) wire.

2. Remove cap from orange (230 v) spliced wire.

3. Replace orange wire with red wire.

4. Recap both wires.

IMPORTANT: BE CERTAIN UNUSED WIRES

ARE CAPPED. Failure to do so may damage the

transformers.

Operating voltage to compressor must be within voltage

range indicated on unit nameplate. On 3-phase units, volt-

ages between phases must be balanced within 2%.

Table 2 — Electrical Data

UNIT

48HJ

NOMINAL

VOLTAGE

(3 Ph,

60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST COMBUSTION

FAN MOTOR POWER SUPPLY DISCONNECT

SIZE

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty FLA

(ea) LRA

(ea) Hp FLA LRA FLA LRA FLA MCA MOCP* FLA LRA

015

208/230 187 254 39.7 228 — — 3 1.7 3.8 3.7 10.5/10.5 84.5/84.5 — — 0.57 65/65 100/100 64/64 324/324

4.6 18.8 0.57 70/70 100/100 70/70 343/343

460 414 508 19.9 114 — — 3 0.8 1.9 3.7 4.8 42.3 — — 0.30 32 50 32 162

2.3 6.0 0.30 34 50 34 168

575 518 632 16.0 91 — — 3 0.75 1.5 3 3.9 23.4 — — 0.57 26 40 26 119

2.1 4.8 0.57 28 40 29 124

017

208/230 187 254 28.2 160 28.2 160 3 1.7 24.8 5 15.8/15.8 105/91 — — 0.57 84/84 110/100 90/90 499/485

4.6 18.8 0.57 89/89 110/110 95/95 518/504

460 414 508 14.1 80 14.1 80 3 0.8 10.8 5 7.9 46 — — 0.30 42 50 45 238

2.3 6.0 0.30 44 50 47 244

575 518 632 11.3 64 11.3 64 3 0.75 8.4 5 6.0 37 — — 0.57 34 40 36 190

2.1 4.8 0.57 36 45 39 195

025

208/230 187 254 35.6 198 35.6 198 2 5.5 24.8 10 28.0/28.0 193/168 — — 0.57 119/119 150/150 127/127 639/614

4.6 18.8 0.57 124/124 150/150 133/133 657/632

460 414 508 17.8 99 17.8 99 2 2.8 10.8 10 14.6 84 — — 0.30 60 70 65 304

2.3 6.0 0.30 63 80 67 310

575 518 632 14.3 79 14.3 79 2 3.4 8.4 10 13.0 66 — — 0.57 52 60 56 241

2.1 4.8 0.57 54 60 59 246

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*This is the maximum size permissible; smaller fuse size may be used where

conditions permit.

NOTES: In compliance with NEC requirements for multimotor and combina-

tion load equipment (refer to NEC Articles 430 and 440), the overcurrent pro-

tective device for the unit shall be fuse or HACR breaker. The Canadian units

may be fuse or circuit breaker.

LEGEND

EQUIP — Equipment

GND — Ground

NEC — National Electrical Code

TB — Terminal Board

NOTE: Maximum wire size for TB1 is 2/0.

Fig. 14 — Field Power Wiring Connections

Use the following formula to determine the percent volt-

age imbalance.

% Voltage Imbalance:

= 100 x max voltage deviation from average voltage

average voltage

EXAMPLE: Supply voltage is 460-3-60.

AB =452 v

BC =464 v

AC =455 v

Average Voltage = 452 +464 +455

=1371

= 457

Determine maximum deviation from average voltage:

(AB) 457 −452 =5 v

(BC) 464 −457 =7 v

(AC) 457 −455 =2 v

Maximum deviation is 7 v.

Determine percent voltage imbalance:

% Voltage Imbalance =100 x 7

457

=1.53%

This amount of phase imbalance is satisfactory as it is be-

low the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance

is more than 2%, contact your local electric utility com-

pany immediately.

Unit failure as a result of operation on improper line

voltage or excessive phase imbalance constitutes abuse and

may cause damage to electrical components.

FIELD CONTROL WIRING — Install a Carrier-approved

accessory thermostat assembly according to installation

instructions included with accessory. Locate thermostat as-

sembly on a solid interior wall in the conditioned space to

sense average temperature.

Route thermostat cable or equivalent single leads of col-

ored wire from subbase terminals through conduit in unit to

low-voltage connections as shown on unit label wiring dia-

gram and in Fig. 15.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (Ameri-

can Wire Gage) insulated wire (35 C minimum). For 50 to

75 ft, use no. 16 AWG insulated wire (35 C minimum). For

over 75 ft, use no. 14 AWG insulated wire (35 C minimum).

All wire larger than no. 18 AWG cannot be directly con-

nected at the thermostat and will require a junction box and

splice at the thermostat.

Set heat anticipator settings as follows:

UNIT VOLTAGE UNIT W1 W2

48HJD015 All 1.20 —

48HJD025, HJE015,

HJE017 All 1.20 0.60

Settings may be changed slightly to provide a greater de-

gree of comfort for a particular installation.

Refer to Accessory Remote Control Panel instructions if

required.

Step 9 — Make Outdoor-Air Inlet Adjustments

MANUAL OUTDOOR-AIR DAMPER — All units (except

those equipped with a factory-installed economizer) have a

manual outdoor-air damper to provide ventilation air.

Damper can be preset to admit up to 25% outdoor air into

return-air compartment. To adjust, loosen securing screws

and move damper to desired setting, then retighten screws to

secure damper (Fig. 16).

OPTIONAL FACTORY-INSTALLED ECONOMIZER

Economizer Motor Control Module (See Fig. 17-19) — Set

economizer motor to the D setting (Fig. 18).

Damper Vent Position Setting

1. Set fan switch at ON position (continuous fan operation)

and close night switch if used.

2. Set system selector switch at OFF position.

3. Turn damper adjustment knob located on control module

clockwise slowly until dampers assume desired vent po-

sition. Do not manually operate economizer motor. Dam-

age to motor will result.

NOTE: Refer to accessory installation instructions included

with the ﬁeld-installed economizer for installation informa-

tion. Also see Accessory Field-Installed Economizer Adjust-

ment section on page 12.

Step 10 — Install Outdoor-Air Hood — The outdoor-

air hood is common to 25% air ventilation and economizer.

If economizer is used, all electrical connections have been

made and adjusted at the factory. Assemble and install hood

in the ﬁeld.

NOTE: The hood top cover, upper and lower ﬁlter retain-

ers, hood drain pan, baffle (017 and 025 only), and ﬁlter sup-

port bracket are secured opposite the condenser end of the

unit. The screens, hood side panels, remaining section of ﬁl-

ter support bracket, seal strip, and hardware are in a package

located inside the return-air ﬁlter access panel (Fig. 20).

1. Attach seal strip to upper ﬁlter retainer. See Fig. 21.

2. Assemble hood top cover, side panels, upper ﬁlter re-

tainer, and drain pan (see Fig. 22).

3. Secure lower ﬁlter retainer and long portion of support

bracket to unit. See Fig. 22. Leave screws loose on 017

and 025 units.

4. 48HJ017,025 Units Only: Slide baffle behind lower ﬁlter

retainer and tighten screws.

Fig. 15 — Field Control Thermostat Wiring

Fig. 16 — 25% Outdoor-Air Section Details

5. Loosen sheet metal screws for top cover of base unit

located above outdoor-air inlet opening.

6. Match notches in hood top cover with unit top cover screws.

Insert hood ﬂange between top cover ﬂange and unit. Tighten

screws.

7. Insert outdoor-air inlet screens and spacer in channel

created by lower ﬁlter retainer and ﬁlter support bracket.

8. Attach remaining shorter section of ﬁlter support bracket.

Fig. 17 — Economizer DamperAssembly — End View

LED — Light-Emitting Diode

Fig. 18 — Economizer Motor Control Module

Fig. 19 — Economizer Motor Control

Module Location

Fig. 20 — Outdoor-Air Hood Component Location

Fig. 21 — Seal Strip Location

START-UP

Use the following information and Start-Up Checklist

on page CL-1 to check out unit PRIOR to start-up.

Unit Preparation — Check that unit has been installed

in accordance with these installation instructions and appli-

cable codes.

Compressor Mounting — Loosen the compressor hold-

down bolts until sidewise movement of the washer under

each holddown bolt head can be obtained. Do not loosen

completely as bolts are self-locking and will maintain

adjustment.

Internal Wiring — Check all electrical connections in

unit control boxes; tighten as required.

Refrigerant Service Ports and Valves — Each 48HJ

unit has 2 Schrader-type service ports per circuit; one on the

suction line and one on the liquid line. Be sure that the caps

on the ports are tight. The units also have 2 service valves

per circuit; one on the suction line and one on the discharge

line. Be sure all valves are open.

Crankcase Heater — Crankcase heater is energized

as long as there is power to the unit.

IMPORTANT: Unit power must be on for 24 hours

prior to start-up. Otherwise, damage to compressor may

result.

Evaporator Fan — Fan belt and pulleys are factory in-

stalled. See Tables 3A, 3B, 4, and 5 for Fan Performance

Data. Remove tape from fan pulley and adjust pulleys on

48HJ015 units as required. See Evaporator-Fan Perfor-

mance Adjustment section on page 19. Be sure that fans ro-

tate in the proper direction. See Table 6 for air quantity lim-

its. See Table 7 for static pressure drops for accessories and

options. See Fig. 23 and 24 for fan performance using hori-

zontal adapter and power exhaust. To alter fan performance,

see Performance Adjustment sections on page 19.

Condenser-Fans and Motors — Condenser fans and

motors are factory set. Refer to Condenser-Fan Adjustment

section on page 20 as required. Be sure that fans rotate in the

proper direction.

Return-Air Filters — Check that correct ﬁlters are in-

stalled in ﬁlter tracks (see Table 1). Do not operate unit with-

out return-air ﬁlters.

Outdoor-Air Inlet Screens — Outdoor-air inlet screens

must be in place before operating unit.

Accessory Field-Installed Economizer Adjust-

ment — Remove ﬁlter access panel. Check that outdoor-

air damper is closed and return-air damper is open.

Economizer operation and adjustment are described in

Base Unit Operation section on page 17; and Economizer

Adjustment section on page 20.

NOTES:

1. Dimensions are in millimeters.

2. The 50DP900211 high static regain adapter accessory may be used

to provide horizontal supply/return.

NOTE: The 50DP900211 horizontal supply/return adapter accessory

improves 48HJ fan performance by increasing external static pres-

sure by amount shown above.

Fig. 23 — Horizontal Supply/Return Fan Performance

With 50DP900211 High Static Regain Adapter

Fig. 22 — Outdoor-Air Hood Details

Table 3A — Fan Performance Data, 48HJ015, 208/230, 460-V Units

AIRFLOW

(CFM)

EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 741 510 0.58 854 715 0.82 952 921 1.05 1041 1130 1.29 1124 1344 1.53

4000 773 647 0.74 882 859 0.98 978 1071 1.22 1064 1285 1.46 1145 1502 1.71

4250 806 796 0.91 912 1015 1.16 1004 1233 1.40 1089 1452 1.65 1167 1674 1.91

4500 839 958 1.09 942 1183 1.35 1032 1407 1.60 1114 1632 1.86 1191 1859 2.12

4750 873 1134 1.29 972 1365 1.56 1060 1595 1.82 1140 1825 2.08 1215 2056 2.34

5000 908 1323 1.51 1003 1560 1.78 1089 1796 2.05 1167 2032 2.32 1241 2268 2.58

5250 942 1527 1.74 1035 1769 2.02 1118 2011 2.29 1195 2252 2.57 1267 2494 2.84

5500 978 1745 1.99 1067 1992 2.27 1148 2240 2.55 1223 2487 2.83 1293 2733 3.11

5750 1013 1978 2.25 1099 2230 2.54 1179 2484 2.83 1252 2736 3.12 1321 2988 3.40

6000 1049 2227 2.54 1132 2483 2.83 1210 2742 3.12 1282 2999 3.42 1349 3257 3.71

6250 1085 2491 2.84 1166 2751 3.13 1241 3015 3.44 1312 3279 3.74 1378 3541 4.03

AIRFLOW

(CFM)

EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 1203 1562 1.78 1277 1784 2.03 1349 2010 2.29 1417 2240 2.55 1483 2473 2.82

4000 1222 1724 1.96 1294 1950 2.22 1364 2180 2.48 1431 2413 2.75 1495 2650 3.02

4250 1242 1900 2.16 1313 2129 2.43 1381 2362 2.69 1446 2599 2.96 1509 2839 3.23

4500 1264 2089 2.38 1333 2322 2.65 1399 2558 2.91 1463 2799 3.19 1525 3042 3.47

4750 1286 2290 2.61 1354 2528 2.88 1419 2769 3.15 1482 3012 3.43 1542 3259 3.71

5000 1310 2507 2.86 1376 2748 3.13 1440 2992 3.41 1501 3240 3.69 1560 3489 3.98

5250 1335 2737 3.12 1399 2983 3.40 1461 3230 3.68 1522 3481 3.97 ———

5500 1360 2981 3.40 1423 3231 3.68 1484 3483 3.97 1543 3737 4.26 — — —

5750 1386 3241 3.69 1448 3495 3.98 1508 3750 4.27 — — — — — —

6000 1413 3514 4.00 1474 3773 4.30 1532 4032 4.59 — — — — — —

6250 1440 3803 4.33 1500 4066 4.63 1558 4330 4.93 — — — — — —

LEGEND

Bhp — Brake Horsepower Input to Fan

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

NOTES:

1. Boldface indicates standard operating range.

2. indicates ﬁeld-supplied motor and drive required.

3. All other numbers indicate ﬁeld-supplied drive required.

4. Factory shipped motor drive range is 1194 to 1526 rpm. Other rpms

require a ﬁeld-supplied drive.

5. Static pressure losses (i.e., economizer) must be added to exter-

nal static pressure before entering Fan Performance table. See

Table 7 for accessory/FIOP static pressure information.

6. Interpolation is permissible. Do not extrapolate.

7. Maximum continuous bhp is 4.25 and the maximum continuous

watts are 3775. Extensive motor and drive testing on these units

ensures that the full horsepower range of the motor can be uti-

lized with conﬁdence. Using your fan motors up to the watts rating

shown will not result in nuisance tripping or premature motor fail-

ure. Unit warranty will not be affected.

Table 3B — Fan Performance Data, 48HJ015, 575-V Units

AIRFLOW

(CFM)

EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 741 510 0.58 854 715 0.82 952 921 1.05 1041 1030 1.29 1124 1344 1.53