Carrier 48HJ015-025 User Manual

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

48HJ015-025

Single Package Rooftop Units

Electric Cooling/Gas Heating

1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Refer to the User’s Information Manual provided with this unit for more details.

2. Do not store or use gasoline or other ﬂammable vapors 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 neighbor’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).

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained andqualiﬁed 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, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes.W earsafetyglasses and work gloves. Use quenching cloth for unbrazing operations. Have ﬁre extinguishers available for all brazing operations.

Before performing service or maintenance operations on unit, turn offmain power switch to unit. Electrical shock could cause personal injury.

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

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 necessary to permit unit drain to function properly. Unit leveling tolerance is ±1⁄16in. per linear ft in any direction. Refer to Accessory Roof Curb Installation Instructions for additional 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.

INSTALLATION

Instructions continued on page 3.

ACCESSORY

PACKAGE NO.

50PQ900221

50PQ900141

50PQ900151

50DP900211

CURB

HEIGHT

18-29

(305)

28-09

(610)

28-09

(610)

18-119

(584)

DESCRIPTION ‘‘A’’ ‘‘B’’ ‘‘C’’

Standard Curb —

149 High

Standard Curb

for Units Requiring

High Installation

Horizontal Supply

and Return Curb

Pre-Assembled,

High-Static,

Horizontal Adapter

LEGEND

COMP SECT. — Compressor Section NOTES:

1. Roof curb accessory is shipped unassembled.

2. Insulated panels,

3. Dimensions in ( ) are in millimeters.

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

4. Direction of airﬂow.

5. Roof curb: 18 gage steel.

6. Attach all ductwork to roof curb.

7. Field installation of sidewall is mandatory.

Fig. 1 — Roof Curb and Horizontal Adapter Details

———

08-2

(64)

08-6

(159)

⁄

18-69

(457)

⁄

18-25⁄

(371)

58-69

(1676)

68-29

(1880)

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. 2 — Horizontal Supply/Return 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.

Step2 — 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 ±

⁄16in. per linear ft in any direction. See Fig. 3 for additional information. Unit operating 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 combustible 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 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).

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 distribution requirements. Unit weight is shown in Table 1.

Instructions continued on page 7.

MAXIMUM SHIPPING

UNIT

48HJ D015 1920 871

E015 1940 880 E017 2310 1048 D025 2535 1150

WEIGHT

Lb Kg

Dimension A

UNIT Ft-in. mm

48HJD015 3-1 48HJE015 3-1 48HJE017 3-4 48HJD025 3-4

⁄

⁄41035

⁄41010

949 946

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 postfrompackaging to protect coil fromdamage.Usebumper boards for spreader bars.

5. Weights do not include optional economizer.See Table1 for economizer weight.

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

Table 1 — Physical Data

UNIT SIZE 48 OPERATING WT (lb)

COMPRESSOR 06D Semi-Hermetic

REFRIGERANT TYPE R-22

CONDENSER COIL Copper Tubes, Aluminum or Copper Plate Fins

CONDENSER FAN Propeller Type, Direct Drive

EVAPORATOR COIL Copper Tubes, Aluminum or Copper Plate Fins

EVAPORATOR FAN Centrifugal, Adjustable Pitch Belt Drive

FURNACE SECTION

HIGH-PRESSURE SWITCH

LOW-PRESSURE SWITCH

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

Number 122 Cylinders 646

Charge (lb)

System 1 22.50 14.25 17.50 System 2 — 15.00 17.00

Rows 344 Fins/in. 15 15 15 Total Face Area (sq ft) 22.2 22.2 22.2

Nominal Cfm 10,500 10,500 14,200 Number...Diameter (in.) 3...22 3...22 2...30 Motor Hp (1075 Rpm) Watts Input (Total) 1090 1090 3400

Rows 234 Fins/in. 17 15 15 Total Face Area (sq ft) 17.9 17.9 17.9

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

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

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

Natural Gas

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

Natural Gas

Thermostat Heat Anticipator Setting

Stage 1 Stage 2

Gas Valve Quantity 1/2 2 2 Cutout (psig) 426

Reset (psig) 320 Cutout (psig) 7

Reset (psig) 22

208/230, 460 V 575 V

AIR INLET SCREENS Cleanable

Economizer, Quantity...Size (in.)

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

Quantity... Size (in.)

HJD015/HJE015

⁄

HJE017 HJD025

⁄

.113...33 .113...33 .113...33

(1) .055...54/

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

1.2/1.2 —/0.6

2...20 x 25 x 1

1...20 x 20 x 1

4...20 x 20 x 2

4...16 x 20 x 2

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

1.2

0.6

1...1075

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

1.2

0.6

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

Ft-in. mm Ft-in. mm

DIMENSIONS

D015 3-2 965 4-0 1219

UNIT 48HJ

E015 3-2 965 4-0 1219 E017 3-7

ABCD

Lb Kg Lb Kg Lb Kg Lb Kg

⁄

1102 3-65⁄

WEIGHT OF CORNER*

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 bereduced

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. Withtheexception of clearance forthe condenser coil andthe 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 08side for top cover drip edge.

⁄169 (8) on each

1083

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 tobe attached to accessoryroofcurb 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, allfour 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)tocombustible surfaces (when

not using curb). h. Control box side: 3809 (914) to ungrounded sur-

faces (non-combustible). i. Controlboxside: 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 coilandthe damper/power exhaust asstated in Note No. 5, a removable fence or barricade requires no clearance.

7. Dimensions are from outside of corner post. Allow

⁄169 (8) on each side for top cover drip edge.

08-

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

CORNER WEIGHT*

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use ﬂexible duct connectors between 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. Ductwork openings are shown in Fig. 1, 4, and 5. Duct connections are shown in Fig. 6. Field-fabricated concentric ductwork 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: Dimensions A, A8, B, and B8 are obtained from ﬁeld-supplied ceiling diffuser.

areas indicate block-off pans.

Fig. 8 — Concentric Duct Details

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)

Fig. 9 — Flue Hood Location

PRESSURE SWITCH

COMBUSTION FAN HOUSING

HEAT EXCHANGER SECTION

Fig. 10 — Combustion Fan Housing Location

Step6—TrapCondensate Drain — See Fig. 11

for drain location. One3⁄4-in. half coupling is provided inside unit evaporator section for condensate drain connection. An 81⁄2in. x3⁄4-in. diameter and 2-in. x3⁄4-in. diameter pipe nipple, coupled to standard3⁄4-in. diameter elbows, provides 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 sure tap for test gage connection at unit. Field gas piping must include sediment trap and union. See Fig. 13.

⁄8-in. NPT pres-

3/4" FPT DRAIN CONNECTION

1-3/8" DRAIN HOLE

Fig. 11 — Condensate Drain Details

Fig. 12 — Condensate Drain Piping Details

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 (

⁄4-in. NPT).

Fig. 13 — Field Gas Piping

Step 8 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factory wired for voltage 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.

Table 2 — Electrical Data

NOMINAL

UNIT

VOLTAGE

48HJ

(3 Ph,

60 Hz)

208/230 187 254 39.7 228 — — 3 1.7 3.8 3.7 10.5/10.5 84.5/84.5

015

208/230 187 254 28.2 160 28.2 160 3 1.7 24.8 5 15.8/15.8 105/91

017

208/230 187 254 35.6 198 35.6 198 2 5.5 24.8 10 28.0/28.0 193/168

025

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.

VOLTAGE

RANGE

Min Max RLA LRA RLA LRA Qty

460 414 508 19.9 114 — — 3 0.8 1.9 3.7 4.8 42.3

575 518 632 16.0 91 — — 3 0.75 1.5 3 3.9 23.4

460 414 508 14.1 80 14.1 80 3 0.8 10.8 5 7.9 46

575 518 632 11.3 64 11.3 64 3 0.75 8.4 5 6.0 37

460 414 508 17.8 99 17.8 99 2 2.8 10.8 10 14.6 84

575 518 632 14.3 79 14.3 79 2 3.4 8.4 10 13.0 66

LEGEND

COMPRESSOR

No. 1 No. 2

OFM IFM FLA

LRA

(ea)

Hp FLA LRA FLA LRA FLA MCA MOCP* FLA LRA

(ea)

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

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, voltages between phases must be balanced within 2%.

POWER

EXHAUST

— — 0.57 65/65 100/100 64/64 324/324

4.6 18.8 0.57 70/70 100/100 70/70 343/343 — — 0.30 32 50 32 162

2.3 6.0 0.30 34 50 34 168 — — 0.57 26 40 26 119

2.1 4.8 0.57 28 40 29 124 — — 0.57 84/84 110/100 90/90 499/485

4.6 18.8 0.57 89/89 110/110 95/95 518/504 — — 0.30 42 50 45 238

2.3 6.0 0.30 44 50 47 244 — — 0.57 34 40 36 190

2.1 4.8 0.57 36 45 39 195 — — 0.57 119/119 150/150 127/127 639/614

4.6 18.8 0.57 124/124 150/150 133/133 657/632 — — 0.30 60 70 65 304

2.3 6.0 0.30 63 80 67 310 — — 0.57 52 60 56 241

2.1 4.8 0.57 54 60 59 246

NOTES: 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. The Canadian units may be fuse or circuit breaker.

COMBUSTION

FAN MOTOR

POWER SUPPLY

DISCONNECT

SIZE

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

457

=1.53%

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.

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 assembly on a solid interior wall in the conditioned space to sense average temperature.

Route thermostat cable or equivalent single leads of colored wire from subbase terminals through conduit in unit to low-voltage connections as shown on unit label wiring diagram and in Fig. 15.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American 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 connected at the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipator settings as follows:

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 position. 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 information.Also see Accessory Field-Installed Economizer Adjustment section on page 12.

Step10 — 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 retainers, hood drain pan, baffle (017 and 025 only), and ﬁlter support bracket are secured opposite the condenser end of the unit. The screens, hood side panels, remaining section of ﬁlter 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

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.

Fig. 16 — 25% Outdoor-Air Section Details

+ 22 hidden pages