York 2000 user manual

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Page 1

SUNLINE 2000



SINGLE PACKAGE HEAT PUMPS

INSTALLATION INSTRUCTION

MODELS B*CH 036 AND 048 (STYLE B)

GENERAL

YORK Model BCH units are single package heat pumps designed for outdoor installation on a rooftop or a slab. Supplemental electric heate rs are available as field-instal led accessories.

The units are completely assembled on rigid, permanently attached base rails. All pipi ng, refrigeran t charge, a nd electrical wiring is factory-installed and tested. The units require only electric power and duct co nnecti ons at the po int of i nstall ation.

Supersedes: 511.06-N5Y (1298)

AND MODELS B*CH 060A (STYLE A)

(10 SEER - w/Belt-Drive Option)

(* = 3 or 5)

Replacement Parts:

Refer to Parts M anual for complete li sting of replacem ent

•

part s on this equipment.

All forms referenced in this instruction may be ordered from:

Standard Register Norman, OK 73069 T oll Free: Tel. 877-318-9675/Fax. 877-379-7920

511.06-N5Y (500)

035-16197

The supplemental electric heaters have nickel-chrome elements and utilize single point power connection.

INSPECTION

As soon as a unit is received, it should be inspected for possible damage during transit. If damage is evident, the extent of the damage should be note d on the carrier’ s fre ight bil l. A se parate request for inspection by the carrier’s agent should be made in writing. Refer to Form 50.15-NM for additional information.

REFERENCE

Additional information on the design, installation, operation and service of this equipment is av ailab le in the f ollo wing ref erence forms:

55.70-N1 -General Installation

•

55.70-N2 -Pre-start & Post-start Check List

•

530.18-N1.2V -Economiz er Acces so ry

•

530.18-N1.13V -Man. Outdoor Air Damper Accy 0-35%

•

530.18-N1.14V -Man. Outdoor Air Damper Accy 0-100%

•

530.18-N1.12V -Motorized Outdoor Air Damper Accy.

•

530.18-N7.1V -Electric Hea te r Acce ss ory

•

530.18-N7.2V -Fuse Block Accessory

•

Installer shou ld pay particular attent ion to the word s: NOTE, CAUTION and WARNING. Notes are intended to clarify or make the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury and/or equipmen t da ma ge may result if inst a ll at io n pro ce du r e is not han dl ed properly.

APPROVALS

Design certified by U.L. and C.G.A. as follows:

1. For use as a heat pump only unit or a heat pump unit with supplemental electric heat.

2. For ou td oo r inst a ll at io n on ly.

3. For in stallation on combustibl e ma te ria l.

LIMITATIONS

CAUTION

THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE WITH THE ENCLOSED INSTALLAT I ON I NST RUCTIONS AND ANY APPLI CABL E

LOCAL, STATE, AN D NA TIONAL CODES I NCLUDING, BUT NOT LIMIT E D

TO, BUILDING, ELECTRICAL, AND MECHANICAL CODES.

WARNING

I NCORRECT INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF THE PRODUCT COULD CAUSE PERSONAL INJURY OR PROPERTY DAM AGE.

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511.06-N5Y

TABLE OF CONTENTS

General................................................................................ 1

Inspection............................................................................. 1

Reference............................................................................. 1

Approvals ............................................................................. 1

Nomenclature....................................................................... 2

INSTALLATION

Limitations............................................................................3

Location ...............................................................................3

Condensate Drainage Precaution.......................................3

Rigging and Handling .......................................................... 3

Clearances...........................................................................3

Ductwork .............................................................................. 3

Filters ................................................................................... 4

Condensate Drain................................................................4

Service Access .................................................................... 4

Blower Speed Selection....................................................... 4

Disconnect Switch Bracket For Optional Belt-Drive ............ 4

Compressors........................................................................ 4

Thermostat...........................................................................4

Power and Control Wiring.................................................... 4

Electric Heaters ................................................................... 5

Optional Economizer Rain Hood.............................. .. .........6

OPERA T ION

Cooling System.................................................................. 12

Preliminary Opera tion Cooling................................. .......... 12

Cooling Sequence of Operation....... .............. .............. ......12

Heating Sequence of Operation................. .. .. .. .............. ...12

Defrost Sequence of Operation......................................... 12

Lockout Control..................................................................13

Checking Supply Air CFM....... .. .............. .. .. .............. .. .. .. ...13

Secure Owner’s Approval .................................................. 14

MAINTENANCE

Normal Maintenance ....... .................................................. 14

TABLES

No. Description Page

1 Unit Application Data................ .. .. .. ............ 3

2 Air Flow Limitati on s..... .. .. .. .. .............. .......... 5

3 Physical Data.............................................. 7

4 Supply Air Perf. 5 Supply Air Perf. 6 Supply Air Perf.

3 & 4 Ton w/Belt-Drive Blower 5 Ton w/Belt-Drive Blower

w/Di rect - D ri ve B l o w e r.......... 10

.. 9

........ 10

7 Static Resistances ...................................... 10

8 Motor and Drive Data - Belt-Drive Blower .. 11

9 Electrical Data w/Direct-Drive Blower......... 11

10 Electrical Data w/Belt-Drive Blower............ 11

11 Belt-Drive Sup pl y Air Moto r Pulley Adj.

......

FIGURES

No. Description Page

1 Center of Gravity......................................... 3

2 Recommended Drain Piping....................... 4

3 Typical Field Wiring..................................... 5

4 Economizer Rain Hood Assembly.............. 6

5 Adjusting Enthalpy Setpoint........................ 7

6 Dimensions and Clearances....................... 8

7 Defrost Initiati on Times............... ...... ...... .... 12

8 Ambient Modified Time/Temp. Control........ 12

9 Hole Loc. for Press. Drop Readings ........... 13

10 Press. Drop versus Supply Air CFM........... 13

PRODUCT NOMENCLATURE

B 3 C H A

PRODUCT CATEGORY

B = Single Package Heat Pump (Air Cooled)

PRODUCT GENERATION

3 = Third Generation 4 = Fourth Generation

5 = Fifth Generation

PRODUCT IDENTIFIER

CH = Heat Pump

2 Unitary Products Group

NOMINAL COOLING CAPACITY

30 6 2 5

036 = 3 Ton 048 = 4 Ton 060 = 5 Ton

VOLTAGE CODE

06 = 208/230-1-60 25 = 208/230-3-60 46 = 460-3-60 58 = 575-3-60

FACTORY INSTALLED HEAT

A = No Supplemental Heat

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INSTALLATION

These units must be installed i n accordanc e with the curren t edition of the following national and local safety codes:

In U.S.A.:

1. National Electrical Code ANSI/NFPA No. 70.

2. Local elec tric ut il ity requirements . In Canada:

1. Canadian El ectrical Code C22.1

2. Canadian Installation Codes CAN/CGA-B149.1 and .2. Refer to Table 1 for Unit Applic at ion Data. If components are to be added to a unit to meet local codes, they

are to be installed at the dealer’s and / or the customer’ s expense .

511.06-N5Y

WARNING: The unit should not be installed in an area where mud

or ice could cause personal injury. Remember that condensate wil l drip fro m the ou tdoor co il during heat and defrost cycle s and that this co ndensate will freeze when the temperat ure of the outdoor air is below 32°F.

RIGGING AND HANDLING

Exercise care when moving the unit. Do not remove any packaging until the unit is near the place of installation. Rig the unit by attaching chain or cable slings to the lifting holes provided in t he base rails. Spreaders, wh ose length exceed s the larges t dime nsion across the uni t, MUST be used acros s the top of the unit.

BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT WILL LIFT EVENLY.

Size of unit for propos ed in st al la tion sh ou ld be ba sed on hea t loss / heat gain calculation made according to the methods of Air Conditioning Contractors of America (ACCA).

LOCATION TABLE 1

*Rated in accordance with ARI Standard 110, utilization range "A".

Use the following guidelines to sele ct a suitable location for these units.

1. Unit is designed for outdoor installation only.

2. Outdoor coil must have an unlimited supply of air.

3. For ground level installation, a level pad or slab should be

4. Roof structures must be able to support the weight of the unit

- UNIT APPLICATION DATA

V oltage V ariation

Min. / Max.*

Wet Bulb Temperature (°F) of Air

Cooling

Heating

on Indoor Coil, Min. / Max. Dry Bulb Temperature (°F) of Air

on Outdoor Coil, Min. / Max. Minimum Dry Bulb T emper ature

(°F) of Air on Outdoor Coil

used. The thickn ess and size of the pa d or slab used should meet local codes and unit weight. Do not tie the slab to the building foundation.

and its options and / or accessories. Unit m ust be installed on a solid level roof curb or appropriate angle iron frame.

208/230V 187 / 253

460V 414 / 506 575V 518 / 630

57 / 72

45 / 120

-10

Units may also be moved or lifted with a forklift. Slotted openings in the base r ai ls ar e provided for th is purpose .

LENGTH OF FORKS MUST BE A MINIMUM OF 42". Remove the nesting b rackets from th e four corn ers on to p of

the unit. All screws that are removed when taking these brackets off must be replaced on the unit.

Refer to T able 3 for unit weights and to Figure 1 for approximate center of gravity.

CLEARANCES

All units req uire cer tain clearances for prop er operation and

APPROXINATE CENTER OF GRAVITY

FRONT

⁄

“

FIG. 1

- CENTER OF GRAVITY

⁄

“

service. Refer to Figure 6 for the clearances required for combustib le construct ion, servicing, an d proper unit op eration.

WARNING:Do not permit overhangin g s tru ct ure s or sh rub s to

obstruct outdoor air di sc ha rge out le t.

“

⁄

“

CAUTION: If a unit is to be installed on a roof curb or special frame

DUCTWORK

other than a YORK roof curb , gasketing must be applied to all surfaces that come in contact with the unit underside.

Ductwork should be designed and sized according to the methods in Manual Q of the Air Conditioning Contractors of

5. Maintain le v el tole rance t o 1/2" m aximum a cross th e entire

America (ACCA).

length or width of the unit.

A closed return duct system shall be used. This shall not

6. Elevate the unit sufficiently to prevent any blockage of the air entrances by snow in areas where there will be snow accumulation . Check the local weathe r bureau for the ex-

preclude u se of ec onomizers or outd oor fres h air inta ke. The supply and r eturn air duct connections at t he unit should be made with flexible j oint s to m inimiz e th e tr ansm issi on o f no ise .

pected snow accumulation in your area.

The supply and return air duct systems should be designed for

OUTDOOR COIL CONDENSA TE DRAI NAG E PRECA UTION

Condensate will drain from the outdoor coil during the heating and defrost cycles. Normally this condensate may be allowed to drain directly onto the ground/roof. A gravel bed is recommended to prevent mud splashing.

Unitary Products Group 3

the CFM and static requirements of the job. They should NOT be sized to matc h the dime nsions of the duct connect ions on the unit.

CAUTION: When fastening duc twor k to the side duct fl ange s

on the unit, insert the screws through the duct flanges only. DO N OT insert the sc rews through t he

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511.06-N5Y

casing. Outdoor ductw ork must be insulated and waterproofed.

Refer to Figure 6 for infor mation concerning side and bottom supply and return air duct openings.

FILTERS

1" filters are supplied with each unit. 2" replacement filters may be used with no modification to the filter racks. Filters must always be installe d ahead of the evaporator c oil and must be kept clean or rep laced wit h same siz e and type . Dirty filte rs will reduce the capacity of the unit and will result in frosted coils or safety shutdown. Minimum filter area an d required sizes are shown in T able 3.

Figure 6. Several existing screws at the top of the unit and one approximately midway down from the top will be used for mounting the bracket. Screws should be lo os ened onl y - NOT REMOVED. Mounting holes in the bracket have elongated keyways allowing easy installation. Re-tighten screws after bracke t is in pl ac e to ens ure pan el s wil l rem ai n le ak t ight.

COMPRESSORS

On some units the co mpressor is mounted on spr ings which have been tightened down for shipment only.

After this un it is in stalle d, back out the compre ssor bo lts unti l the sleeve clears the top g r om me t.

CAUTION: Do Not loosen compressor mounting bolts.

CONDENSATE DRAIN

Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install a condensate drain line from the 3/4" PVC f emale conn ection on the un it to spill into an open drain.

NOTE: The condensate drain line MUST be trapped to provide

proper drainage. See Figure 2.

SERVICE ACCESS

FIG. 2

- RECOMMENDED DRAIN PIPING

Access to all serviceable components is provided by the follo w in g rem o vable pane ls :

Compressor compartment

•

Heater compartment

•

Blower compartment

•

Main control box

•

Filter compartment

•

Motor Access (on units w /b el t-d rive option)

•

Refer to Figure 6 for locati on of th es e ac ce ss pan el s .

BLOWER SPEED SELECTION

Three blower motor speeds are available on the di rect-drive units. The speed selection for the direct-drive units is determined by the CFM and ESP requirements of the applications. Al l units with belt-drive optio n have an a dj us ta ble motor pulley to achieve the above conditions.

All direct-drive units are shipped with the black wire (labeled #8) connected to the high speed tap on the blower motor. If a lower blo wer speed is desire d, this wire shou ld be mov ed to the medium or low speed tap on the motor.

DISCONNECT SWITCH BRACKET FOR UNITS WITH OPTIONAL BELT-DRIVE BRACKET

A special bracket for mounting a field-supplied disconnect switch is provided in each unit ordered with an optional belt-drive supp ly air blower. The bracket is shipped inside the blower compartment taped to the top of the blower housing. Install the bracket on the left hand side of the unit as shown in

THERMOSTAT

The room thermostat should be located on an inside wall approximately 56" above the floor where it will not be subject to drafts, sun exposure, or heat from electrical fixtures or appliances. Follow manufacturer’s instructions enclosed with thermostat for general installation procedure. Color coded insulated wires (#18 AWG) should be used to connect thermostat to unit. See Figure 3 for w iring det ai ls.

NOTE: On units with econ omizer, remove jumper "J1" from

termin als 8 and 10 on plug connector J3/P 7 on the relay board in the unit control box. Refer to the unit wiring labels located on the inside of the control box access panel.

An "Emergency Heat" position is provided with the thermostat. In the "Emergency Heat" position, the thermostat will allow electric resistance heat only. The compressor will be locked out. A pilot light on the thermostat will indicate that the switch is on "EM HT".

POWER AND CONTR OL WIRING

Field wiring to the unit must conform to provisions of the National Electrical Code (NEC) ANSI/NFPA No. 70 (in U.S.A.), current Canadian Electrical Code (CEC) C22.1 (in Canada) and/or local ordinances. The unit must be electrically grounded in accordance with the NEC and CEC (as specified above) and/or local codes. V oltage tolerances which m ust be maintained at the compressor terminals during starting and running conditions are indicated on the unit Rating Plate and T ab le 1.

The wiri ng har n ess fu rni shed w ith t his un it is an int egral part of a UL and C.G.A. design certified unit. Field alteration to comply with electrical codes should not be required.

A disconnect switch should be field provided for the unit. The switch must be separate from all other circuits. Refer to Figure 6 for installation location. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram.

Electrical lines must be sized properly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly protected.

CAUTI ON: When connecting electrical power an d contro l wi r-

ing to the unit, waterproof type connectors MUST BE USED so that water or moisture cannot be drawn into the unit during normal operation. The above waterproofing conditions will also apply when install ing a field-sup plied disconnect switch.

Refer to Figure 3 for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information. Refer to Tables 9 and 10 for electrical data.

4 Unitary Products Group

Page 5

ELECTRIC HEATERS

Supplemental electric heaters may be ordered as a field-installed accessory. Refer to Form 530.18-N7.1V for installation instruction . The se UL and C .G. A. appro ve d heaters are located within the central compartment of the unit (see Figure 6 for ac cess panel) wi th the heati ng elements e xtendi ng into the supply air chamber.

Fuses are supp li ed , whe re r eq ui red , by the factory. Some KW sizes require fuses and others do not. Refer to the electric heater accessory installation instruction for the heater electrical data.

The minimum air flow limitations across these heaters are listed in Table 2.

TABLE 2

NOMINAL

- AIR FLOW LIMITATIONS

HEATER

SIZE

VOLT AGE

UNIT MODEL SIZE, NOMINAL TONS

1,100 1,100 1,200 1,200

1,300

10 15 20

5 7

208 /

230-1-60

1,100 1,100 1,200 1,200

1,300

10 15 20

5 7

208 /

230-3-60

30 10

15 20

460-3-60

1,100 1,200 1,200 1,300

30 10

15 20

575-3-60

1,200 1,200 1,300

1208/230 and 46 0 v olt heaters are UL appro v ed . 208/230 and 575 volt h eaters are CGA approved.

CGA minimum is 1,40 0 C FM .

511.06-N5Y

345

MINIMUM SUPPLY AIR CFM

1,300 1,300 1,300 1,300

–

1,300

–

1,300 1,300 1,300 1,300

1,300

–

1,300 1,300 1,300 1,300

–

1,300 1,300 1,400

–

1,600 1,600 1,600 1,600

1,600 1,600

1,600 1,600 1,600 1,600 1,600 1,600

1,600 1,600 1,600 1,600 1,600

1,600 1,600 1,600 1,800

24-volt thermostat with subbase;

-2TH11704024 for manual changeover.

-2TH11704124 for automatic changeover.

Only required on units with supplemental electric heat.

CONTROL WIRING

Electronic progammable thermostat 2ET04700324 with subbase for either

manual or automatic changeover.

Only required on units with economizer. Remove jumper L2 from terminals 4 and 9 on jumper plug P7. The outdoor air intake dampers will return to their fully closed position when the thermostat switches to the “unoccupied” mode.

Second stage cooling may be used on units with economizer. Remove jumper J1 from terminals 8 and 10 on jumper plug connector P7.

Only required on units with supplemental electric heat.

POWER WIRING

TO REMOTE SENSOR 2TH04702224 IF USED

REFER TO ELECTRICAL DATA T ABLES TO SIZE THE DISCONNECT SWITCH, THE WIRING AND THE OVERCURRENT PROTECTION.

FIG. 3

- TYPICAL FIELD WIRING

REFER TO ELECTRICAL DATA T ABLES TO SIZE THE DISCONNECT SWITCH, THE WIRING AND THE OVERCURRENT PROTECTION.

Unitary Products Group 5

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511.06-N5Y

OPTIONAL ECONOMIZER RAIN HOOD

The following proced ure sh ou ld be us ed when ass em bling an economizer rai n hood onto a unit. Ref er to Figure 4. The ou tdoor and return air dampers, damper actuator, the linkage and all the controls a re factory mounted as pa rt of the economizer option.

All of the hood c ompo nent s, incl udin g t he fi lters , the gask e ting and the hardware f or assemblin g are located abov e the top filte r racks within th e filte r section . The outdoor air sens or is in th e bag of parts located at the bott om of th e ret urn air section.

1. With filter section access panel removed, take out hood components, filters and sensor described above. Remove and discard outdoor air opening cover on back unit (Upper right hand corner).

2. Remove the 1/2" knockout (A) in the units rear panel (located to the right side of the outdoor air opening). Insert the two loose wires from inside the unit, into the 1/2" bushing provided. Inser t w ires a nd bushi ng in to knockout. Snap bushing into place.

3. Mount the outdoor air sensor to the rear panel, just below the knocko ut described in Step 2. Secure with t wo self-drill ing screws at dimples (B) provided in the panel.

NOTE: Sensor must be positioned so that the sensing ports

4. Connect th e two wires, indicated i n Step 2, to th e sensor as

•

5. Assemble the LH and RH side pl ates to the top cover (2

are at the top (louvers pointing downward) and terminal connections to the right.

follows:

Wire #73 to terminal (+) Wire #74 to terminal (S)

screws each side) to f orm the hood . App ly gask eting to the flange surface on each side plate. Extend gasketing 1/4" beyond top and bottom of each flange to insure adequate corner sealing. Secure this assembly to the unit back panel (upper right hand corner). First, remove screw (C) on unit top cover. Then slip flan ge of hoo d co v e r in unde r fla nge of unit top cov er, replace screw (C), en gaging hole (E) in hood

flange and tighten. Attach the two side plates to the unit panel by using two self-drilling screws for each side plate at dimples (D) provided in the panel.

6. Position fillpiece at bottom of hood, between the two side plates but do not secure at this time. (Slotted openings MUST be downward for drainage). After fillpiece is properly positioned, n ote wh ere cont act i s made w ith t he uni t pa nel. Remove fillpiece a nd ap ply gas ket mate r ial t o this a rea to provide a seal. Reposition fillpiece and secure with 2 screws.

7. Install the two filters into the hood assembly, sliding down along retainers on side plates, into fillpiece at bottom of hood.

NOTE: Install filters so that "Air Flow" arrows point toward the

unit.

8. Install filt er c over over the e nd of th e ho od with one scr ew (center of hood), securing filters into position.

CAUTION: When proceeding with steps 9 and 10, extreme

care must be exercised while turning both the set point and minimum position adjusting screws to prevent twisting them off.

9. The enthal py set point for the dampers may now be set by selecting th e des ire d set- poi nt from graph in Figure 5. For a single enthal py economizer, carefully tur n the set-point adjusting screw to the "A", "B", "C" or "D" setting corresponding to the lettered curve. For a dual enthalpy economizer, carefully turn the set-point adjusting screw fully clockwise past the "D" setting.

10. To c heck that the damper blad es move smoothly without binding, carefully turn the minimum position adjusting screw fully cl ockwise and then energize and de -energize termin als "R" t o "G". With termi nals "R" to "G" energ ized, turn the minimum position screw counterclockwise until the desired mini mum position has been attained.

11. Replace the filter section access panel.

OUTDOOR AIR

HOOD

FILTER COVER

GASKETED FLANGE

L. H. SIDE PLATE

FILTERS

FIG. 4

- ECONOMIZER RAIN HOOD ASSEMBLY (OPTION)

6 Unitary Products Group

COVER

FILLPIECE

OPENING COVER

GASKETED FLANGE

R. H. SIDE PLATE

SIDE DUCT

APPLICATION SHOWN

OUTDOOR AIR SENSOR

GASKET

FILTER SECTION ACCESS PANEL

Page 7

511.06-N5Y

FIG. 5

- ENTHALPY SET POINT ADJUSTMENT

TABLE 3

SUPPLY AIR

- PHYSICAL DATA

BLOWER

INDOOR

COIL

OUTDOOR

FAN

OUTDOOR

COIL

AIR

FIL TERS

(SEE NOTE)

MODELS

CENTRIFUGAL BLOWER (Dia. x W d. in.) FA N MOTOR HP (Direct-Drive Units) FA N MOTOR HP (Belt-Drive Units)

ROWS DEEP FINS PER INCH FACE AREA (Sq. Ft.)

PROPELLER DIA. (in.) F AN MOTOR HP NOM. CFM TOT A L

ROWS DEEP FINS PER INCH FACE AREA (Sq. Ft.)

QUANTITY P E R UNIT (15" x 20" x 1") QUANTITY PER UNIT (14" X 25" X 1") TO TAL FACE AREA (sq. ft.)

BCH

036 048 060

12 x 10

4,300

17.1

1.5 16

4.3 22

6.3

12 x 10

⁄

12 x 10

⁄

1.5

5.1 22

⁄

4,200

17.1

2 1

6.3

1.5 3

5.1

⁄

4,500

17.1 2

6.3

WEIGHTS (LBS)

3 Ton 555

Basic Unit

4 Ton 595 5 Ton 620

OPTIONS / ACCESSORIES

Electric Heat (Nominal KW)

5 - 7 KW 18 10 - 15 KW 23

20 - 30 KW 28 Economizer 50 Belt-Drive Blower 5 Motorized Outdoor

Air Damper Barometric Relief/Fixed

Outdoor Air Intake Damper

26 10

Roof Mounting Curb 92

CHARGE REFRIGERANT 22 (lbs./oz.) 7/12 8/4 8/4

COMPRESSOR HERMETIC, RECIPRICATING (Qty) 1 1 1

NOTE: Filter racks are adapted for 1" or 2" thick fil ters.

Unitary Products Group 7

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511.06-N5Y

(Direct-Drive Units) FIELD-SUPPLIED DISCONNECT SWITCH

FILTER ACCESS

LOCATION

BLOWER ACCESS

CONTROL BOX ACCESS

OUTDOOR COIL

COMPRESSOR ACCESS

⁄

FRONT VIEW

⁄

“ PVC FEMALE

COND. DRAIN (See Detail ”A")

A, B

⁄

WIRING ENTRY (See Detail “B”)

⁄

BOTTOM SUPPLY & RETURN AIR OPENINGS (SEE NOTE)

B - POWER WIRING ENTRY

A - CONTROL WIRING ENTRY

⁄

CLEARANCES

Front 24"

12" (Less Economizer)

Back

Left Side (Filter Access)

Right Side (OD Coil) 24" Below Unit

Above Unit

NOTE: Units and ductwork are approved for zero clearance to combustible materials when equipped with electric heaters.

Units may be installed on combustible floors made from wood or

class A, B or C roof covering material. (Applicable in USA only). 2

Units must be installed oudoors. Overhanging structures or shrubs

should not obstruct the outdoor coil nor the fan outlet.

36" (With Economizer or Fixed Air/Motorized Damper)

24" (Less Economizer) 36" (With Economizer)

20"

72" (For Outdoor Air Discharge)

ELECTRIC

⁄

HEAT ACCESS

⁄

DUCT COVERS - Units are shipped with all air duct openings covered. For

side duct applications;

1.Remove and discard the supply and return air duct covers.

⁄

UNIT BASE WITH RAILS

Shown separately to illustrate bottom duct openings and power connection locations.

NOTE: For curb-mounted units, refer to the duct hanger dimensions of the curb for the proper size of the supply and return air duct connections.

2.Connect ductwork to duct flanges on the rear of the unit. For

bottom duct applications;

1. Remove the side supply air duct cover to gain access to the bottom supply air knockout panel.

2. Remove and discard the bottom knockout panel.

3. Replace the side duct cover.

4. With filter section access panel remov ed from the unit, remove and discard the bottom return air knockout panel.

5. Replace the filter access panel.

All dimensions are in inches. They are subject to change without notice. Certified di-

⁄

mensions will be provided upon request.

⁄

UTILITIES ENTRY DATA

HOLE

KNOCKOUT

SIZE

USED FOR

⁄

(DIA.)

⁄

REAR VIEW

SIDE SUPPLY AND RETURN

AIR OPENINGS

⁄

A7/8" * B2" *

*Knockouts in the bottom of the unit can be located by the slice in the insulation.

Do not remove the 2" knockout ring.

Control Wiring (Side or Bottom)**

Power Wiring (Side or Bottom)

AIR FLOW LEGEND

RETURN AIR

⁄

"A"

⁄

DETAIL “B”

⁄

UNIT WITH FIXED OU TDOO R

AIR/MOTORIZED DAMPER RAIN HOOD

⁄

FIG. 6

⁄

“ CONDENSATE

DRAIN (must be trappe d)

⁄

SUPPLY AIR

OUTDOOR AIR

OUTDOOR AIR (Economizer)

DIMENSION "A"

⁄

DETAIL “A”

UNIT WITH ECONOMIZER RAIN HOOD

FIXED

OUTDOOR

AIR DAMPER

MOTORIZED

DAMPER

- DIMENSIONS & CLEARANCES - 3, 4 & 5 TONS

8 Unitary Products Group

⁄

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511.06-N5Y

TABLE 4

- SUPPLY AIR PERFORMANCE - 3 & 4 Ton Units w/Belt-Drive Blower

3 TON - SIDE DUCT CONNECTIONS @230/460/575 Volts

MODEL

BCH

AIR FLOW

CFM

0.20 0.30 0.40 0.50 0.60 0.70 0.80

RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 2000 843 860 880 925 919 1005 956 1065 993 1145 1030 1195 1067 1235 1900 817 775 854 850 893 920 930 995 970 1065 1008 1125 1046 1170 1800 790 700 828 760 867 840 906 905 944 980 985 1040 1025 1100 1700 - - 802 670 840 745 881 815 920 900 961 970 1001 1030

036

1600 - - - - 818 665 858 740 898 820 940 890 980 950 1500 - - - - - - 842 695 882 755 922 835 962 895 1400 - - - - - - 833 650 867 705 904 765 942 820 1300 - - - - - - - - 858 665 893 725 932 785 1200 - - - - - - - - 847 640 880 680 916 730

MODEL

BCH

AIR FLOW

CFM

0.90 1.00 1.10 1.20 1.30 1.40 1.50

RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 2000 1103 1270 - - - - - - - - - - - 1900 1085 1210 - - - - - - - - - - - 1800 1064 1145 1102 1180 - - - - - - - - - 1700 1040 1075 1081 1115 1121 1140 - - - - - - - -

036

1600 1020 1005 1060 1050 1100 1085 - - - - - - - 1500 1003 945 1044 995 1086 1035 - - - - - - - 1400 982 880 1024 920 1067 965 1107 1000 - - - - - 1300 970 835 1010 870 1053 920 1099 960 - - - - - 1200 953 780 992 815 1034 855 1080 905 - - - - - -

NOTE: FOR 208 V O LTS, MULTIPLY VALUES B Y 0.95. *INCLUDES ALLOWANCES FOR A WET INDOOR COIL AND 1" FILTERS. REFER TO TABLE 7 FOR RESISTANCE VAL UES ON APPLICATIONS OTHER THAN HEAT PUMP UNITS

WITH SIDE DUCT AIRFLOWS.

Available External Static Pressure - IWG*

4 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts

MODEL

BCH

AIR FLOW

CFM

0.20 0.30 0.40 0.50 0.60 0.70 0.80

048

MODEL

BCH

AIR FLOW

CFM

0.90 1.00 1.10 1.20 1.30 1.40 1.50

RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 2000 1103 1270 - - - - -------1900 1085 1210 - - - - -------1800 1064 1145 1102 1180 - - -------1700 1040 1075 1081 1115 1121 1140 --------

048

1600 1020 1005 1060 1050 1100 1085 -------1500 1003 945 1044 995 1086 1035 -------1400 982 880 1024 920 1067 965 1107 1000 -----1300 970 835 1010 870 1053 920 1099 960 -----1200 953 780 992 815 1034 855 1080 905 ------

NOTE: FOR 208 V O LTS, MULTIPLY VALUES B Y 0.95. *INCLUDES ALLOWANCES FOR A WET INDOOR COIL AND 1" FILTERS. REFER TO TABLE 7 FOR RESISTANCE VAL UES ON APPLICATIONS OTHER THAN HEAT PUMP UNITS

WITH SIDE DUCT AIRFLOWS.

Available External Static Pressure - IWG*

Unitary Products Group 9

Page 10

511.06-N5Y

TABLE 5

- SUPPLY AIR PERFORMANCE - 5 Ton

w/Belt-Drive Blower

5 TON - SIDE DUCT CONNECTIONS @ 230/460/575 Volts

MODEL

BHN

AIR FLOW

CFM

0.20 0.30 0.40 0.50 0.60 0.70 0.80

RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 2500 1059 1560 1077 1590 1095 1630 1114 1650 1134 1660 1158 1685 1181 1720 2400 1032 1405 1054 1470 1074 1525 1094 1560 1116 1595 1140 1620 1167 1640 2300 1005 1260 1024 1275 1049 1370 1069 1440 1090 1475 1116 1505 1142 1535 2200 980 1160 1002 1170 1022 1190 1044 1250 1066 1350 1090 1410 1117 1440 2100 930 1060 957 1070 983 1080 1010 1100 1039 1160 1064 1260 1092 1340

060

2000 877 950 908 975 941 1000 976 1020 1009 1050 1040 1100 1070 1225 1900 - - - - 894 885 940 940 980 980 1014 1020 1047 1095 1800 - - - - 855 815 903 860 950 905 988 940 1022 970 1700 - - - - - - 884 815 925 850 964 880 1001 910 1600 - - - - - - 864 770 908 805 948 835 987 870 1500 - - - - - - - - 882 740 926 780 965 830

MODEL

BCH

AIR FLOW

CFM

0.90 1.00 1.10 1.20 1.30 1.40 1.50

RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 2500 - - - - - - - - -----2400 1193 1665 - - - - - - -----2300 1170 1580 1202 1620 - - - - -----2200 1148 1480 1180 1530 - - - - -----2100 1121 1385 1155 1425 1190 1475 - - ------

060

2000 1100 1285 1133 1340 1169 1385 1205 1445 -----1900 1079 1180 1110 1240 1143 1280 1178 1330 1222 1375 ---1800 1058 1060 1090 1135 1122 1190 1158 1240 1196 1295 ---1700 1035 960 1071 1030 1103 1100 1134 1140 1164 1175 1197 1205 - 1600 1020 900 1056 965 1088 1035 1118 1065 1145 1105 1170 1130 1198 1150 1500 1004 860 1038 880 1070 925 1101 980 1130 1045 1158 1075 1184 1110

NOTE: FOR 208 V O LTS, MULTIPLY VALUES B Y 0.95. *INCLUDES ALLOWANCES FOR A WET INDOOR COIL AND 1" FILTERS. REFER TO TABLE 7 FOR RESISTANCE VAL UES ON APPLICATIONS OTHER THAN HEAT PUMP UNITS

WITH SIDE DUCT AIRFLOWS.

Available External Static Pressure - IWG*

TABLE 6

- SUPPLY AIR PERFORMANCE - 3, 4 & 5 Ton

w/Direct-Drive Blower

230 / 460 / 575 VOLTS - SIDE DUCT APPLICATIONS

MODEL

BCH

036

048

060

NOTE: FOR 208 V O LTS, MULTIPLY VALUES B Y 0.95. *INCLUDES ALLOWANCES FOR A WET INDOOR COIL AND 1" FILTERS. REFER T O TABLE 7 FOR RESISTANCE VALUES ON APPLICATIONS OTHER THAN HEAT PUMP UNITS

WITH SIDE DUCT AIRFLOWS.

TABLE 7

MOTOR

SPEED

HI MED LOW

0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00

CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts

- 1660 1470

- 1810 1635

- 2390 2270

850 750

910 810

1350 1320

1630 1440

- 1780 1610

- 2350 2230

- STATIC RESISTANCES*

820 725

880 780

1300 1270

- 1590 1410

2000

- 1740 1580

2500

- 2300 2190

EXTERNAL STATIC PRESSURE DROP

DESCRIPTION

Economizer Electric Heaters Bottom Duct Connections

1Deduct these resistance values from the available external static pressure shown in the respective Blower Performance T able. 2

The pressure thru the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM

during full economizer operation.

1, 2

5 - 15 KW 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.16

20 - 30 KW 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20

1000 1200 1400 1600 1800 2000 2200 2400 2600

0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23

0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.14 0.16

Available External Static Pressure - IWG*

780 700

1010

850 760

1400 1255 1220

- 1500

750

1550 1370

1950 1700 1555

2420 2245 2145

675 975

825 740

1350 1210 1170

1330 1905

1665 1540

2340 2190 2090

720 650

945 800 730

1300 1165 1110

1450 1290

1840 1620 1510

2260 2130 2030

1600

795

1665

825

1720

RESISTANCE, IWG

CFM

765 690 625

910 775 715

1250 1120 1070

1540 1400 1250

1770 1560 1460

2160 2065 1960

735 665 610

825 740 690

1190 1075 1020

1490 1360 1220

1660 1480 1400

2060 1990 1890

700 650 600

825 700 660

1135 1030

970

1380 1270 1130

1530 1390 1300

1925 1900 1810

670 610 560

775 660 615

1065

970 920

10 Unitary Products Group

Page 11

511.06-N5Y

TABLE 8

- MOTOR AND DRIVE DATA w/Belt-Drive Blower

MOTOR*

FRAME

SIZE

MODEL

BLOWER

RANGE

(RPM)

HP RPM

SERVICE

FACTOR

ADJUSTABLE

MOTOR PULLEY

PITCH

DIA.

(in.)

BORE

(in.)

FIXED

BLOWER PULLEY

PITCH

DIA.

(in.)

BORE

(in.)

BELT

PITCH

LENGTH

(in.) BCH 036 790 - 1120 1-1/2 1725 56 1.15 2.4 - 3.4 7/8 5.7 1 37.3 A36 BCH 048 790 - 1120 1-1/2 1725 56 1.15 2.4 - 3.4 7/8 5.7 1 37.3 A36 BCH 060 850 - 1220 1-1/2 1725 56 1.15 2.4 - 3.4 7/8 5.2 1 37.3 A36

*All motors have soli d ba ses an d ar e inh er en tly pr ot ect ed . These motors can be selected to oper a te into the i r service f a cto r be cau se th e y ar e loca te d in th e mo ving air, upstre am of an y heating device.

TABLE 9

MODEL

- ELECTRICAL DATA

BCH

POWER SUPPLY

MIN. MAX. RLA LRA

208/230-1-60

036

208/230-3-60 460-3-60 575-3-60

208/230-1-60

048

208/230-3-60 460-3-60 575-3-60

208/230-1-60

060

208/230-3-60 460-3-60 575-3-60

NOTES: 1. Rated in accordance wtih ARI Standard 110, utilizatin range "A".

2. Dual element, time delay type.

w/Direct-Drive Blower Motor

VOLT AGE

LIMITATIONS

(SEE NOTE 1)

187 187 414 518

253 253 504 630

COMPRESSOR

19.0

11.9

5.9

4.8

23.1

14.7

7.7

6.4

32.1

19.3

10.0

7.9

105

85 42 34

105 130

64 52

169 137

62 50

OUTDOOR

FAN

MOTOR,

FLA

1.7

1.0

2.3

1.4

2.3

1.4

SUPPLY

AIR

BLOWER

MOTOR,

FLA

4.4

2.2

5.0

2.2

6.6

3.3

MINIMUM

CIRCUIT

AMPACITY

29.9

21.0

10.6

10.2

36.1

25.7

13.2

11.6

49.0

33.0

17.2

14.6

MAX.

FUSE

SIZE,

(SEE NOTE 2)

AMPS

45 30 15 15

50 40 20 15

80 50 25 20

HACR

BREAKER

AMPS

DESIG-

NATION

MAX.

SIZE,

45 30 15 15

50 40 20 15

80 50 25 20

TABLE 10

MODEL

BCH

- ELECTRICAL DATA

POWER SUPPLY

LIMITATIONS

(SEE NOTE 1)

MIN. MAX. RLA LRA

208/230-1-60

036

208/230-3-60 460-3-60 575-3-60

208/230-1-60

048

208/230-3-60 460-3-60 575-3-60

208/230-1-60

060

208/230-3-60 460-3-60 575-3-60

NOTES: 1. Utilizatio n Range “A” in accordance with ARI Standard 110.

2. Dual element, time delay type.

187 187 414 518

w/Belt-Drive Blower Motor

VOLT AGE

253 253 504 630

COMPRESSOR

19.0

11.9

5.9

4.8

23.1

14.7

7.7

6.4

32.1

19.3

10.0

7.9

105

85 42 34

105 130

64 52

169 137

62 50

OUTDOOR

FAN

MOTOR,

FLA

1.7

1.0

2.3

1.4

2.3

1.4

SUPPLY

AIR

BLOWER

MOTOR,

FLA

5.3

3.1

8.6

5.2

2.6

2.0

8.6

6.0

3.0

2.4

MINIMUM

CIRCUIT

AMPACITY

34.8

21.9

11.5

11.1

39.7

25.9

13.6

11.4

51.0

32.4

16.9

13.7

MAX. FUSE SIZE,

(SEE NOTE 2)

AMPS

45 30 15 15

50 40 20 15

80 50 25 20

MAX.

HACR

BREAKER

SIZE,

AMPS

45 30 15 15

50 40 20 15

80 50 25 20

Unitary Products Group 11

Page 12

511.06-N5Y

OPERATION

COOLING SYSTEM

The unit has an air-co oled cond enser and i s factory- charged with Refrigerant-22.

The compressor is hermetically sealed, internally sprung, mounted on spring isolators and inherently (internally) protected. If there is an abnormal temperature rise in the compressor, the protector will open to shut down the compressor.

250

200

150

100

T3 - 110 Minute Setting (Factory Set Point)

T2 - 80 Minute Setting

PRELIMINARY OP ERATION COOLING

After the installation has been completed, the crankcase heater of the compressor must be energized f or at least 4 hours bef ore starting the unit. After this initial warm-up, the compressor should be given three false starts (energized just long enou gh to make a few revolutions) with a 5 minute delay between each start before being put into full time service.

NOTE: Prior to each co oling season, the crankcase he ater

must be energiz ed at least 10 ho urs befo re the syst em is put into operation.

COOLING SEQUENCE OF OPERATION

When the thermost at call s f or cool ing, the comp ressor a nd the outdoor f an mo to r w ill b e e ne r gi z e d t hro ug h t erminal "Y1 " a nd the supply air blower motor will be ene rgi z e d through terminal "G" (if the fan switch on the subbase is set in the "AUTO" position). The supply air blower motor will run continuously if the fan switch is set in the "ON" pos it io n.

The reversing valve is energized th ru th e "O" cir cui t when the subbase is in the cooling mode.

HEATING SEQUENCE OF OPERATION

The following sequence of operation is based on using a standard Y ORK he at pump thermostat w ith two heatin g stages.

FIRST STAGE HEAT When the thermostat calls for heating, the compressor and the

outdoor f an mo to r w ill b e e ne r gi z e d t hro ug h t erminal "Y1 " a nd the supply air blower motor will be ene rgi z e d through terminal "G" (if the fan switch on the subbase is set in the "AUTO" position). The supply air blower motor will run continuously if the fan switch is set in the "ON" pos it io n.

T1 - 50 Minute Setting

TIME BETWEEN DEFROST CYCLES, MINUTES

-10

FIG. 7

- DEFROST INITIATION TIMES

10 OUTDOOR AMBIENT, DEG. F

40 50

EXAMPLE: If t he ti me is factory set on pin T-3 (110 minutes at 35°F outdoor) and the out door temper ature climbs to 45°F, the time initiation cycle will decreas e to every 100 minut es.

If the outdoor temperature drops to 10°F where ice is less likely to form, the 110 minute interval will extend to every 150 minutes.

Two r equir ements must be m et before a def rost c ycle ca n be initiated.

1. The defrost time cycle must be complete.

2. The liquid line te mp erature must be l es s t ha n 2 8°F. Defrost will terminate when the liquid line sensor reaches 55°F

or after 10 minutes . The defrost time cycle will restart 10 minutes after the start of

the defrost cycle even though the liquid sensor terminated defrost after 3 minutes.

During troubleshooting, the defrost time can be reduced to 20 seconds by sh orting out the SW1 tes t pegs on the module . The pegs are 1 /2" long, 3/ 16" apar t and are m ounted on a whit e base. See Figure 8.

SECOND STAGE HEAT If compressor operation can not satisfy the heating

requirements, second stage heat will energize supplemental

T2 - 80 MINUTE SETTING

T3 - 110 MINUTE SETTING

(Factory Set Point)

T1 - 50 MINUTE SETTING

electric heat (if supplied) thru the "W1" circuit.

DEFROST SEQUENCE OF OPERATION

The BCH has a un ique “ambient modif ied” time-temperature defrost control that automatically adjusts to changes in the outdoor temperature. The defrost control will shorten the defrost in itiation time pe riods above 35°F and will extend the defrost initiation time periods below 35°F. The control is factory set to defro st at 110 m inute s (T3) , but it can be field adj us ted

SHORTING PEGS TO OVERRIDE TIMER FOR SERVICE

MOVABLE JUMPER WIRE TO CHANGE DEFROST TIMER

to defrost a t 80 m inu te s ( T2 ) o r 5 0 mi nut es ( T1) in a rea s wit h high humidity.

The curve in Figure 7 shows how defrost initiation times are automatically compensated for changes in outdoor temperature.

12 Unitary Products Group

FIG. 8

- AMBIENT MODIFIED TIME/TEMPERATURE CONTROL

Page 13

LOCKOUT CONTROL

Any one of four conditions will put the system into a lock-out condition durin g th e he at ing or cooling mode:

The discharge line temperature reaches 255°F (215°F reset) or,

2. The discharge pressure reaches 398 PSIG (310 PSIG reset) or,

The suction line f ree z e stat equals 26°F (38°F reset) or ,

4. The low-pressure cut-out equals 7 PSIG (22 PSIG reset).

A lock-out will energize the emergency heat light on the thermostat and the red LED ligh t on the unit relay board. T urning the thermostat switch to "Off" then back to "On", will reset the system.

NOTICE T O O WNER: If a lockout occurs, ch eck for the following problems b efore

calling a serviceman:

1. Dirty filters.

2. Snow accumulation.

3. Leaf or debris blockage.

After eliminating the problem, attempt to restart the system as follows:

turn the system s witch on the thermostat to its "OFF " position

•

for 10 seconds. turn it back to its origi na l po si ti on .

•

If the unit doesn’ t st art, call a se rviceman.

NOTE: Models with an anti-recycle accessory will have a

5-minute delay before starting.

CHECKING SUPPLY AIR CFM

The speed of the supply air blower will depend on the required CFM, the unit acc essories and th e static resistan ces of both the supply and the return air duct systems. With this information, the speed for the supply air blower can be

TABLE 11

*Pulley can be adjusted in half-turn increments.

determined from the b lo wer p erf ormance and st atic re sistan ce data on T ab les 4 through 7.

Knowing the required blower RPM and the blower motor HP, the speed settin g for the supply air mo tor can be determined.

The setting (turns open) for the optional belt-drive supply air pulley can be determined from Table 11 .

- BELT-DRIVE SUPPLY AIR MOTOR PULLEY ADJUSTMENT

TURNS

OPEN*

5 4 3 2 1 0

BLOWER DRIVE RANGE (RPM)

3 TON 4 TON 5 TON

780 842 904

966 1028 1090

790 856 922

988 1054 1120

850 924

998 1072 1246 1220

511.06-N5Y

OPTIONAL BELT-DRIVE BLOWER All units wit h belt-driv e b lowers hav e sin gle spee d motors . T he

variable pitch pu lley on the blower motor can be adjust ed to obtain the desired supply air CFM. Refer to Table 8 for blower motor drive data. The tension on the belts should be adjusted as shown in Figure 9.

Procedure for adjusting belt tension:

1. Loosen nut (D) from the motor mount.

2. Never loosen nuts (C) from each other while loosening nut (D).

3. Adjust the tension by turning bolt (B).

4. Do not loosen the four nuts (top and bottom) (A); unless additional tensioning distance is required; immediately re-tighten these bolts if loosened.

5. Use a belt tension checker to apply a perpendicular force to one belt at the midpoint of the span as shown. The deflection force should be applied until a specific deflection distance of 4mm (5/32")is obtained. To determine the deflection distance from normal position, use a straight edge from sheave to sheave as a reference line. The recommended deflection force is as follows:

Tension new belts at the max. deflection force recommended for the belt section. Check the belt tension at least two times during the first 24 hours of operation. Any re-tensioning should fall between the min. and max. deflection force values.

6. After adjusting, re-tighten nut (D) against the motor mount taking care not to loosen nuts (C).

FIG. 9

- BELT ADJUSTMENT

CAUTION

SPAN LENGTH

(A)

DEFL FORCE

(C)*

(B)

(D)

* NEVER LOOSEN

Start the supply air blower motor. Adjust the resistances in both the supply an d the retur n air duct system s to balan ce the air distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other tha n the equipment inst al le r.

T o check the supply air CFM after the initial balancing has been completed:

Remove the (tw o)

⁄

" dot plugs from the hole s loc ated on

the filter access panel side of the unit.

2. Insert at least 8" of 1/ 4 inch tub ing into each of these h oles for sufficient pene tration into the air flow on both side s of the indoor coil.

NOTE: The tubes must be inserted and held in a position

perpendicular to the air flow so that velocity pressure will not affect the static pres su re rea dings.

3. Using an inclined manometer, determine the pressure drop across a d ry indoor c oil. Since the mo isture on an indoor coil may vary greatly, measuring the pressure drop across a wet coil under field condi tions would be inac curate. To ensure a dry coil, the com pressors should be de-energiz ed while the test is being run.

4. Knowing the pressure drop across a dry coil, the actual CFM through the unit can be determined from the curve in Figure 10.

Unitary Products Group 13

Page 14

511.06-N5Y

WARNI NG:Failure to prope rly adjust th e total syst em air quan -

tity can result in poor system performance.

After readings hav e been obta ined, remo ve th e tubes and se al the drilled holes in the side panels. 5/16" dot plugs (P/N 029-13880) are available through normal parts ordering procedures.

0.5

0.4

0.3

036

048

060

NOTE: DE-ENERGIZE THE COMPRESSORS BEFORE

TAKING ANY TEST MEASUREMENTS TO ENSURE A DRY INDOOR COIL.

0.2

PRESSURE DROP (IWG)

0.1

0 1000 1500 2000 2500 3000

FIG. 10

- PRESSURE DROP ACROSS A DRY INDOOR

NOMINAL CFM

COIL VS. SUPPLY AIR CFM

SECURE OWNER’S APPRO VAL: When the system is functioning properly, secure the owner’s approval. Show him the location

of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature settings within the limi tations of the system.

MAINTENANCE

NORMAL MAINTENANCE

CAUTION: Prior to any of th e following maintenance proce-

dures, shut off all power to the unit to prevent personal injury.

FILTERS - Inspect once a month. Replace disposable or clean permanent type as necessary. DO NOT replace permanent type with disposable.

MOTORS - Indoor fan and outdoor fan motors are permanently lubricated and requi re no mai nt en ance.

OUTDOOR COIL - Dirt should not be allowed to accumulate on the outdoor coil surface or other par ts in the air circuit. Cleaning sh ould be as often a s nec es sar y to kee p coi l cle an. Use a brush, vacuum cleaner attachment, or other suitable means. If water is used to clean coil, be sure power to the unit is shut off prior to cleaning.

NOTE: Exercise care when cleaning the coil so that the coil

fins are not damage d. Do not permit the outdoor air discharge to be ob-

structed by overhanging structures of shrubs.

14 Unitary Products Group

Page 15

511.06-N5Y

Unitary Products Group 15

Page 16

208/230/460 V O LT

MODELS ONLY

208/230/575 VOLT

MODELS ONLY

511.06-N5Y