Carrier 50DL User Manual

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Number One Air Conditioning

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mstaflation, Start-Up and Service Instructions

Carrier Parkway • Syracuse NY 13221

Single-Package Cooling Units

INSTALLATION

Rigging and Unit Placement — Inspect unit for

transportation damage. File claim with transporta tion agency. Do not remove shipping skid until unit is ready to be set in final location. 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 reference. See Fig. 1 for additional information.

Unit weight is shown in Table 1.

Fig. 1 — Rigging Details

Units are designed to be hoisted only. However, units with optional shipping skids may be moved with a fork truck. Refer to Accessory Roof Curb

Installation Instructions for additional information

as required.

Roof Curb — Assemble and install as described in

instructions shipped with this accessory. Accessory

roof curb and information required to field fabricate

a roof curb of 2-in. x 14-in. planks is shown in Fig. 2.

Install insulation, cant strips, roofing and flashing as required. For unit drains to function properly, curb

must be level or within tolerances shown in Fig. 3.

Roof Mount — Check building codes for weight

distribution requirements. Unit weight is shown

in Table 1.

Slab Mount — Provide a level concrete slab that

extends beyond unit cabinet at least 6 inches. Make a slab 8 in. thick with 4 in. above grade. Use gravel apron in front of condenser air inlet to prevent grass and foliage from obstructing airflow.

Alternate Unit Support Methods — Where the

preferred curb or slab mount cannot be used, support unit with sleepers on perimeter, using curb support area. However, if sleepers cannot be used, support long sides of unit (dimension “A,” Fig. 4)

with 4-in. X 4-in. pads equally spaced on each side. Unit may sag if supported by corners only.

Positioning — Unit condenser air inlets and outlets

may be located in any compass direction since they are not affected by wind. Provide clearances around and above unit for airflow, safety and service access (Fig. 4).

Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

Field-Fabricated 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 all

roof openings with flashing and mastic in accord

ance with applicable codes.

Carrier Corporation 1983 Form 50DL-1SI

Roof Curb Dimensions

Insulate ducts passing thru unconditioned spaces

and cover with a vapor barrier.

Maintain one-in. minimum clearance between supply air duct and any combustible material for at least 3 ft of duct run from unit.

Unit is shipped set up for thru-the-bottom duct connections. Ductwork openings are shown in

Fig. 4.

Economizer Section

ECONOMIZER HOODS INSTALLATION (Fig.

5) — The economizer mechanism and all electrical connections are factory installed and adjusted except as noted below. Hood assembly, outdoor air

inlet screens and required hardware are shipped separately and must be field installed. Units have 2 hood assemblies.

Install economizer hoods and enthalpy control

as follows:

1. Loosen unit top panel sheet metal screws above outdoor air inlet opening.

2. Assemble hood top panel, side panels and

support channel.

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3. Insert hood flange between unit top panel flange and unit. Slots are provided in hood flange to clear sheet metal screws. Tighten sheet metal screws. Apply RTV sealant to surfaces as shown in Fig. 5.

4. Secure hood side panels to outdoor air opening flanges, using screws provided.

5. Install hood support bracket(s) between U-

channel and support channel.

6. Install screen retainer on support channel,

using screws in the slots. Do not tighten.

8. Remove enthalpy control assembly from ship ping location on horizontal deck in return air filter compartment.

9. Using 4 no. 10-1/2 screws from envelope in con trol assembly junction box, mount enthalpy control assembly to inside of economizer hood side panel nearest condenser section (Fig. 4).

Fig. 3 — Unit Leveling Tolerances

10. Route the red and yellow wires thru knockout in side plate. Wrap end of blue wire with electrical tape. Using wire connectors from envelope in

junction box, wire enthalpy control assembly as

shown in Fig. 6. Use strain reliefs from envelope on side plate and junction box.

11. Install outdoor air screens.

12. Push retainer snugly against screens and tighten screws.

Exhaust Air Hood Installation — The optional

power exhaust package hood damper assemblies and required sheet metal screws are shipped in the compartment at right of indoor air fan motor com partment. Using screws provided, install a hood damper assembly over each exhaust air opening as shown in Fig. 4. Power exhaust is applied only to economizer units using bottom duct connections.

Exhaust fan and motor assembly is factory wired and adjusted. Refer to Service, Power Exhaust Air Fan Adjustment if required.

Indoor Air Fans — The fan belt and pulleys are

factory installed and adjusted. If required, adjust as described in Service, Indoor Air Fan Adjustment.

Condensate Drains — See Fig. 4 for drain loca

tions. Condensate drain is open to atmosphere and must be trapped. Install a trapped drain line at con nection to be used. Trap must be at least 3in. deep

and made of flexible material or be installed to pre vent freeze-up.

Condensate drain pan under unit is fitted with a one-in. FPT coupling. A gasket is shipped taped to this drain. Install gasket in unit basepan opening or alternate opening on end of unit.

Field Power Supply — Unit is factory wired for

voltage shown on nameplate. The main power ter minal block is suitable for use with aluminum or copper wire. Units have circuit breakers for com pressors, fan motors and control circuit. If required by local codes, provide an additional disconnect switch.

If an external electrical source is used, unit must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI Cl-1978.

All field wiring must comply with National Elec trical Code and local requirements.

Install conduit connector in unit basepan or side panel openings provided as shown in Eig. 4. Route power lines thru connector to terminal connections

in control box as shown in Fig. 8, 9 and 10.

Affix crankcase heater sticker to unit disconnect

switch.

Voltage to compressor terminals during com pressor operation must be within voltage range indicated on unit nameplate. Also, see Tables 2 and

3. Phases must be balanced within 2%. Contact local power company for correction of improper voltage or phase unbalance. Failure due to operation of unit on improper line voltage or with excessive phase unbalance constitutes abuse and may cause damage to unit electrical components.

Field Control Wiring

STANDARD UNIT (WITHOUT ENERGY MANAGEMENT OPTION) — Install a Carrier-

approved accessory electronic thermostat on a sub

base (or a transmitter on subbase if remote sensor is used) per installation instructions included with the accessory. Note that the subbase must be used oh constant volume units without night setback. Locate thermostat, or remote sensor, if used, in the condi tioned space where it will sense average temperature.

Route thermostat cable or equivalent single leads of no. 18 AWG colored wire from subbase terminals thru connector on unit to low-voltage connections in main control box as shown on unit wiring dia gram and in Pig. 8.

UNITS WITH ENERGY MANAGEMENT OPTION — In addition to the standard control box, units with Energy Management option are also equipped with a remote box and a night setback box. The remote box contains a 7-day time clock, a bypass switch that can manually bypass the time clock for up to 5 hours, 6 indicator lights and 2 terminal blocks for field wiring connections. Mount this box remote from the unit in an indoor or

Table 1 — Physical Data

UNIT 50DL OPERATING WEIGHT (lb)

Base Unit Economizer 225 250 Roof Curb 200 225

COMPRESSOR

Quantity...Type Quantity Cylinders (ea)...Rpm 4 1750 4 6 1750 Capacity Steps (%) (Standard) 50, 100 60, 100

With Accessory Unloaders 25, 50, 75, 100

Capacity Steps (%) (Variable Volume)

With Electric Unloaders

REFRIGERANT CHARGE

System 1...System 2 (lb) 37 0 37 0 53 0 42 0

OUTDOOR AIR FANS

Quantity...Diameter (in.) 3 30 4 30 Nominal Cfm 21,000

Motor Hp...Rpm 1 1050

CONDENSER COIL

Rows...Fins/in. 3 158

Total Face Area (sq ft)

INDOOR AIR FANt

Quantity...Size (in.) Maximum Allowable Rpm Nominal Cfm Standard Motor and Drive

Motor Hp Motor Frame Size

Single Speed Two Speed

Fan Pulley Pitch Diameter (in.) Fan Pulley Bore I’Me Single-Speed Motor Rpm

Two-Speed Motor Rpm

Motor Pulley Pitch Diameter (in.)

Pulley A Pulley B

Resulting Fan Rpm

Single-Speed with Pulley A. .B Two-Speed with Pullley A...B

Alternate Motor and Drive

Motor Hp Motor Frame Size

Single Speed

Two Speed

Fan Pulley Pitch Diameter (in.) Fan Pulley Bore I'Me I'Me Single-Speed Motor Rpm Two-Speed Motor Rpm

Motor Pulley Pitch Diameter (in.)

Pulley A Pulley B

Resulting Fan Rpm

Single-Speed with Pulley A...B

Two-Speed with Pulley A...B

EXHAUST FAN MOTOR Quantity...Hp EVAPQRATQR CQIL

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

ELECTRIC RESISTANCE HEATERS

HeatikW

INDQQR AIR FILTERS

No. ...Size

Standard; 2-in Throwaway

Bag Type; 12-in. (Optional)

044

5406 6100

Serviceable, Hermetic

2 06E 2. .06E*

20, 40, 60, 80, 100

25, 50, 75, 100 20, 40, 60, 80, 100

Type 22; Controlled by Thermostatic Expansion Valve

Direct Driven, Propeller Type

28,000 1 1050

61 0

Belt Driven, Centrifugal Type

4 15x9

4 15x11

1300

16,000

20,000

254T 284T

10 6

1750

1750/1170

6 5

5 6 60

1073 925

1073/751

925/617

1073 ..991 1073/751

991/661

256T 286T

80 80

1750

1750/1170

5 3 5 6

1159 1225* 1159 1225

1159/773.

1225/817

1159/773.

1225/817

2 3 2 3

4 15 30 2

Open Nichrome Wire Elements with Multiple-Stage Control

See Electrical Data tables

27 16x25

21 16x25

6 12x24 6 24x24 7 24x24

054 064

6485

250 225

2 06E

6 1750

50, 100

16, 33, 50, 67, 83, 100 16, 33, 50, 67, 83, 100

81 0 81 0

4 30

31,000

1 1150

3 158

81 5

1300

256T 284T 286T

106

I’Me

1750

6 5

25t

284T 286T —

4 15.8

81 25

4 15x11

1450

24,000

286T

1750

1750/1170

56 60

1225 1312 1225/817.

1312/875

30t

286T

10 6

1750

5 3 5 6

4 15 35 4

9 20x25

7 12x24

1750

1750/1170

8 0

1321 —

1321/881

2 3

4 139

35 4

9 20x25

21 16x25

*Unit contains one 06EA250 and one 06EA275 compressor tStandard fan motor supplied with standard fan drive pulleys and

belts; alternate fan motor supplied with alternate fan drive pulleys and belts Other combinations are field supplied Pulley A is installed in unit; Pulley B is shipped with unit (044 and 054).

288

JDue to large frame size, the 25-hp, 208-230-volt and 30-hp

motors are available in single speed only

**The 50DL064 alternate drive is supplied with Pulley A only

Fig. 4 — Base Unit Dimensions

288

APPLY RTV SEALANT TO AREAS SHOWN

Fig. 5 — Economizer Outdoor Air

Inlet Hood Assembly

Fig. 6 — Enthalpy Control Assembly

Fig. 7 — Psychrometric Chart for

Enthalpy Control

MAIN POWER TERMINAL BLOCK IN UNIT CONTROL BOX OR HEATER COMPARTMENT

FIELD POWER

SUPPLY

THERMOSTAT SUBBASE

NOTE Thermostat subbase required.

Fig. 8 — Field Wiring Connections

Constant Volume Units Without

Energy Management Option

TB4 MAIN CONTROL BOX

I I

weathertight space. The night setback box contains a terminal block for field wiring connections, a morning warmup thermostat and the setback/ setup module. The night setback box remains in the unit. Shipping locations of remote box and permanent location of night setback box are shown in Fig. 11.

1. Remove remote box and mount in a restricted access area (indoors or in a weathertight space).

Run separate 115-volt, 60-Hz (230-volt, 50-Hz)

power to the remote box per Fig. 9. Use no. 14

AWG wire or larger and a proper field-supplied

electrical connector.

Install a Carrier-approved accessory electronic thermostat or transmitter if remote sensor is used (subbase not required) according to the installa tion instructions included with the accessory.

Note that the subbase is not used on units with

the Energy Management option. Locate the ther

mostat or remote sensor, if used, in the condi

tioned space where it will sense average

temperature.

Route thermostat cable or equivalent single leads

of no. 18 AWG eolored wire from thermostat or

transmitter terminals thru connector on unit to

low-voltage (TB4) connections in main control

box as shown on unit label wiring diagram and

in Fig. 9.

Run 24-volt wires between the remote box and night setback box per Fig. 9. Use no. 18 AWG wire for lengths up to 100 feet. Local codes may dictate use of conduitfor low voltage. Knockouts are provided in the night setback box and in the fan deck separating heating section from section containing the night setback box (Fig. 11). A watertight connector is installed in side of unit.

Two rubber grommets are taped inside the night

setback box. Use grommets in knockouts in fan deck and night setback box.

288

MAIN POWER TERMINAL

~r~

NOTE Subbase not used

I I

FIELD POWER

SUPPLY

BLOCK IN UNIT CONTROL

BOX OR HEATER COMPARTMENT

Fig. 9 — Field Wiring Connections

Constant Volume Unit With Energy Management Option

Fig. 10 — Field Wiring Connections for 50DL VAV

Fig. 11 — Shipping Location — Remote Box

UNITS WITH VARIABLE VOLUME OPTION — Units do not use room thermostats or sensors. In addition to the main control box, units are equipped with a remote box and a variable volume box. Remote box is described above (Units With

Energy Management Option). The variable volume box (Fig. 12) contains a microprocessor, a morning warmup thermostat, a time-delay relay, 3 unloader

relays, an interlock relay, a night relay, a day relay

and a terminal block for field wiring. Shipping loca tion of remote box is shown in Fig. 11.

1. Remove the remote box and mount in a restricted access area (indoors or in a weathertight space).

2. Run separate 115-volt, 60-Hz (230-volt, 50-Hz) power to the remote box per Fig. 10. Use no. 14 AWG wire or larger and proper electrical con nector (field supplied).

3. Run 24-volt wires between remote box and variable volume box per Fig. 10. Use no. 18 AWG wire for lengths up to 100 feet. Run wire in con duit to unit if local codes dictate. Knockouts are provided in the variable volume box and the fan deck separating heating section from section con taining the variable volume box (Fig. 11). Water tight connectors are installed in unit cornerpost

and side of unit. Two rubber grommets are shipped taped inside variable volume box. Use grommets in knockouts in fan deck and variable volume box.

288

4. If the unit is equipped with electric heat, the room terminals must be controlled to go fully open when unit goes into heating. An interlock relay is provided in the variable volume box. When unit goes into heating, the interlock relay energizes providing switch closure to open the room ter minals. Field connections for the interlock relay are terminals 1 and 2 of the terminal block (TB10) located in upper left corner of electric heat sec tion (Fig. 11).

Route field-supplied power wiring thru watertight connector supplied in unit cornerpost. Make TBIO connections as shown in Fig. 13.

Return Air Filters — Check that return air filters

are of the correct type and size and installed in unit filter racks. Filter data is shown in Table 1. Do not operate unit without return air filters.

Fig. 13 — Morning Warmup Interlock

Outdoor Air Inlet Screens — Outdoor air inlet

screens must be in place before operating unit.

Compressor(s) — Loosen compressor holddown

bolts until sidewise movement of the washer under each holddown bolt head occurs. Do not loosen completely as bolts are self-locking and will main tain their adjustment.

Open the compressor discharge and suction service valves. Replace and tighten valve caps to prevent leaks.

Liquid Line Service Valve — Open the liquid line

service valve. Replace and tighten valve cap to prevent leaks.

Low Ambient Compressor Lockout (Fig. 14) —

All units are equipped with an adjustable low ambient lockout thermostat to lock off the compressor(s) at low outdoor air ambients. Thermostat is located in the main control box. Setting will depend on specific installation but should be approximately 50 F on VAV units and 55 F on constant volume units.

Convenience Outlet — All units are equipped

with a 115-volt convenience outlet for handling

small power load or service light. See Fig. 14.

CIRCUIT BREAKERS CONVENIENCE OUTLET LOW AMBIENT LOCKOUT

Fig. 14 — Control Box

THERMOSTAT

LOGIC PANEL

Table 2 — Electrical Data — 5ODL044 and 054

MODEL

NOMINAL

VOLTS-PH-HZ

50DL044

208/230-3-60

50DL044

460-3-60

50DL044

575-3-60

50DL054

208/230-3-60

50DL054

460-3-60

50DL054

575-3-60

VOLTAGE

RANGE NO. 1 NO 9

Min Max

187

414 508

518 632

187 254

414

518

COMPR

RLA LRA RLA

254

80 345 80

37 173 37

30 120

117 506

508 53

632 42 5

78 5

253 36

176

28 6 120 4

COMPR

LRA

345

173

120

345

173

OUTDOOR

FAN

MOTORS Qty FLA

76 20

(ea)

3 3

(ea)

2 7

(ea) 20

7 6

(ea)

2 7

(ea)

INDOOR

FAN

MOTOR

Hp 15

15 20 15 15

15 46 0 3 11 15 20 20 20 20

15 21 0 15 21 0 3 4 8 20 15 21 0 15 21 0 20 15 21 0 15 21 0 20 20 20 27 0 20

15 17 15 17 3

20 22 20

20 25 20 20 25 75 20 60 3 11 20 25 25 25 25

20 27 20 27 25 34 20 27 20 25 34 20 20 25 34 25 25 34 25 34

20 20 25 25

EXHAUST

FAN

MOTOR

FLA

46 0

— —

FLA

46 0 3 60 0

—

46 0

—■ — 45/54 9 46 0 — 60 0 3 11

11 — — —

—

HEATERS

—

60/73 2

— —

45/54 9

3 11

46 0 60 0 60 0

— —

—

60/73 2 45/54 9

60/73 2 166/184 60 0 3 11 45/54 9 125/184 60 0 3 11

60/73 2 166/184

— — — —

— —

—

27 0

27 0 3

27 0 27 0

27 0 3 4 8

22 —

60 60 3 11 75 60 60

— — — — —

4 8 4 8

3 3

48 73 2 92 — — —

4 8

54 9 69

—

73 2 92

— —

54 9 69

54 9 69 121 73 2 92 54 9 69 73 2 92

_ __

3 9

—

3 3 9

—

— — — —

— —

—

3 11

— — — — 101

— — — —

60/73 2 166/184 75/91 5

— —

—

60/73 2 166/184

60 3 11

—

— —

75 75 3 11 75 3 11

75/91 5

—

60/73 2 166/184 75/91 5 60/73 2 166/184 75/91 5

— — — —

3 48

—

— — —

3 27 3 27 3

22 0

48 48 73 2 92 48 91 5 115

—

48 73 2 92

48 91 5 115 187

—

22 0 3 3 9

— —

27 0 27 0 3 3 9

—

— — 73 2 92 91 5

— — 158

73 2 92 91 5 115 187

— —

—

— —

FLA

— —

125/138 166/184

MCA

249

271

263 249

265/288

285 125/138 166/184 125/138

271

271/288

263

283/305

285

285/305

115

124

121

115

142

130

124

142

149

130

149

—

106

312

334

327

312 208/230

335/363

349

334 208/230

335/363

327 208/230

354/382

349 208/230 354/382

—

141

151

148

149

115 178

151

178

158

113

121

—

118

126

ruvvcn

SUPPLY

MOCP*

300 350 300 300

350/350

350 350 350 350 400 350 400

150 150 150 150 175 150 150 175 175 200 175 200

110 125 125 125

400 450 400 400

400/450

450 450 450 450 500 450 500

175 200 200 200 200 200 200 200 225 250 225 250

150 150 150 150

See Legend and Notes on page 10

Table 3 — Electrical Data — 50DL064

MODEL VOLTAGE

NOMINAL

VOLTS-PH-HZ

50DL064

208/230-3-60

50DL064 460-3-60

Compr — Compressor FLA — Full Load Amps Hp — Nominal Horsepower kW — Kilowatts LRA — Locked Rotor Amps MCA — Minimum Circuit Ampacity MOCP — Maximum Overcurrent Protection RLA — Rated Load Amps

*Fuse only. NOTES (Tables 2 and 3)

1 All outdoor fan motors are single-phase motors 2 All heaters are 3-phase assemblies 3 Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase unbalance in supply volt age is greater than 2% Use the following formula to determine the % voltage unbalance

% Voltage Unbalance

100 X-

RANGE NO. 1

Min Max RLA LRA RLA LRA

187 254 119 506 119 506

414

LEGEND (Tables 2 and 3)

max voltage deviation from average voltage

COMPR

508

average voltage

COMPR

253 53

NO. 2

253

OUTDOOR

FAN

MOTORS

Qty FLA

6 6/6 0

INDOOR

FAN

MOTOR MOTOR

25 75 25 75 30 88 25 75 25 75 30 25 75 3 25 30 30 30 88 3 30 88 3

25 34 25 34 3 48 30 25 25 34 302540

25 34 3 48 30 30

30 40 3 48

30 40 3

EXHAUST

FAN

FLA

— —

—

— — — — — — — —

3 11

75 3 88 88

34334848

40 40

Example:

A B

Determine maximum deviation from average voltage (AB) 457 - 452 = 5 volts

(BC) 464 - 457 = 7 volts (AC) 457 - 455 = 2 volts

Maximum deviation is 7 volts

Determine % voltage unbalance % Voltage Unbalance = 100 x - ~ = 1 53% This amount of phase unbalance is satisfactory as it is below

the maximum allowable 2%

11 60/73 2 11

—

— —

—

11 11

—

— — —

—

— — — — —

— —

—

Supply voltage is 460-3-60

“ 457

HEATERS

—

60/73 2 75/91 5 208/230 370/382 500

75/91 5 208/230 392 500 60/73 2 75/91 5 60/73 2 75/91 5

— — —

73 2 91 5 115 187 250

73 2 92 91 5 115 187 250 73 2 92 172 250 91 5 115 194 250 73 2 91 5

AB = 452 volts BC = 464 volts AC = 455 volts

FLA

—

166/184 370 450

166/184 392 450

166/184 208/230 383/398 166/184 208/230 405 500

—

92 181

115

Average Voltage =

POWER SUPPLY

MCA

370 400 392 383 450

405 450

383 405 500

166 200 175 200 172 200 166 225

181 175

194 250

452 + 464 -r 455

1371

MOCP*

= 457

¿i

-gíítíf

450

500 500

200 225

250

START-UP

Constant Volume Units

COOLING (WITH OR WITHOUT ENERGY MANAGEMENT OPTION)

1. Open compressor service valves. Make sure the crankcase heater has been on for at least 24 hours to remove liquid refrigerant from compressor crankcase. Check compressor oil level. Oil sight glass should be half full.

2. Be sure that the liquid line service valve is open and that high- and low-side refrigerant service ports are closed as applicable.

3. On units equipped with the Energy Management option, move the COOL SETUP SELECT

jumper wire to the desired setting(5°, 8°, or 12°).

If cooling is not desired during the unoccupied periods, move jumper wire from COOL SETUP to COOL LOCKOUT. See Fig. 15.

4. Turn on power to unit. On standard units, set the subbase selector switch to COOL. On units with the Energy Management option, set the 7-day time clock as required. Refer to 7-Day Time

Clock Adjustment. Check that compressor low

ambient lockout contacts and morning warm-up

contacts (on units with Energy Management option) are closed.

(A) HEATING SETBACK

Fig. 15 — Setback/Setup Module (Partial)

5. Remove cover from thermostat (or from trans mitter if a remote sensor is used); note the red diagnostic light-emitting diodes (LED’s). See

Fig. 16.

6. To call for cooling, move the thermostat or transmitter cooling set point (blue lever) below

room temperature. Cooling LED on the righthand side of thermostat or transmitter should begin to glow. Check the cooling effect at supply duct outlets.If the mechanical cooling does not come on, see Service, Electronic Component Checkout.

7. Move the thermostat or transmitter cooling set point above room temperature. The cooling equipment should cycle off and the cooling

LED intensity should decrease to a faint glow or go off completely. The economizer should move to minimum position.

(B) COOLING SETUP OR LOCKOUT

To Shut Off Unit — For standard units, set the subbase selector switch to OFF or set the cooling temperature selector lever above room tempera ture. For units with Energy Management option, set the cooling temperature selector switch above

room temperature.

Do not shut off unit circuit breakers except

when unit is serviced. Crankcase heater is ener

gized only when unit power is on.

HEATING (Electric Heat Units)

1. Turn on unit power; set circuit breakers at ON.

2. On units with Energy Management option, posi tion the HEAT SETBACK SELECT switch in the setback/setup module to the desired position (5°, 10°, or 15°). See Fig. 15.

3. Move the thermostat or transmitter heating set point (red lever) above room temperature. The

HEATING

LEVER (RED)

COOLING LEVER(BLUE)

COVER THERMOSTAT/TRANSMITTER

Fig. 16 — Electronic Thermostat/Transmitter (Without Subbase)

heating LED on the left-hand side of thermo stat or transmitter should begin to glow. Electric heat should cycle on. Check supply duct outlets for heat. If heating equipment does not cycle on, see Service, Electronic Component Checkout.

4. Move the heating set point below room tempera ture. The heating equipment should cycle off and the heating LED intensity should decrease to a faint glow or go off completely.

5. Return the heating and cooling set points to desired settings and lock in place. On standard units, return subbase switch to desired position. On units with Energy Management option, an adjustable morning warmup thermostat is used to hold dampers closed until return air reaches the setting on the thermostat located in the

night setback box.

To Shut Off Unit — Standard units, set the subbase

selector switch to OFF or set the heating tempera ture selector lever below room temperature. For units with Energy Management option, set the heat ing temperature selector switch below room temperature.

AUTOMATIC CHANGEOVER — Standard units automatically switch from heating to cooling mode when the subbase selector switch is set at AUTO, and the temperature of the conditioned space rises to

the cooling selector lever setting. When the tempera

ture of conditioned space falls to heating selector

lever setting, the unit automatically changes from

cooling mode to heating mode.

The thermostat and unit are so connected that

cooling and heating systems do not operate

simultaneously.

On units with Energy Management option, with dual set point thermostat or transmitter, changeover is also automatic. There is a minimum 3 F deadband between the heating and cooling set points.

ECONOMIZER OPERATION — If unit is

equipped with modulating outdoor air control

(economizer), set enthalpy control (Fig. 4 and 6) at “A.” Unit capability to integrate economizer with

.mechanical cooling allows for a higher changeover

point than conventional economizer systems. Be cause of this, outside air is desired whenever its enthalpy (total heat content) is below return air

enthalpy. Typical return air conditions, shaded portion of Fig. 7, indicate that setting “A” should be used for maximum operating economy.

OPERATING SEQUENCE WITH ECONO MIZER (without Energy Management option)

using thermostat with subbase.

Cooling — System switch set at AUTO, or COOL,

fan switch at ON or AUTO, (indoor air fan runs

intermittently). Thermostat set at desired setting.

When thermostat calls for cooling and outdoor

air enthalpy is below setting of enthalpy controller.

the economizer modulates open. (If outdoor air enthalpy is above enthalpy set point, the outdoor air dampers remain at minimum position.) Econo mizer acts as the first stage of cooling, providing “free cooling” with outside air. If outside air alone cannot satisfy the cooling requirements of condi tioned space, economizer cooling is integrated

with mechanical cooling.

Compressor(s), working simultaneously with economizer, will come on in stages to meet the cooling load.

As the conditioned space temperature approaches the thermostat’s cooling set point, stages cycle off, last stage first. After all stages of mechanical cool ing are off, economizer modulates to minimum

position.

During the cooling cycle, a discharge air sensor

senses discharge air temperature. If discharge air

temperature drops below 62 F, economizer starts

to modulate toward minimum position. At 50 F dis charge temperature, the economizer will be at mini mum position.

Heating — System switch set at HEAT or AUTO.,

fan switch at ON or AUTO., thermostat set at

desired setting. When thermostat calls for heating, one or 2 stages of heat energize to satisfy heating demand.

As space temperature approaches the heating

temperature set point, heating stages cycle off.

During heating, economizer is limited to the minimum position to provide outdoor air for ventilation requirements.

OPERATING SEQUENCE WITH ECONO

MIZER AND ENERGY MANAGEMENT option

(using electronic thermostat or transmitter).

Clock in remote control box switches controls to

OCCUPIED mode. Indoor air fan runs continually

while in OCCUPIED mode.

If return air temperature is below the adjustable setting of morning warmup thermostat, outdoorair dampers remain closed.

When return air temperature goes above setting of morning warmup thermostat, economizer goes to adjustable minimum position.

When thermostat calls for cooling and outdoor air enthalpy is below setting of enthalpy controller, economizer modulates open. (If outdoor air en thalpy is above enthalpy set point, economizer remains at minimum position.) The economizer acts as the first stage of cooling, providing “free cooling” with outside air. If outside air alone cannot satisfy cooling requirements of the conditioned space, economizer cooling is integrated with mechanical cooling.

Compressor(s), working simultaneously with economizer, will come on in stages to meet the cooling load.

As the conditioned space temperature approaches

the thermostat’s cooling set point, stages cycle off,

last stage first. After all stages of mechanical cooling are off, economizer modulates to minimum position.

During the cooling cycle, a discharge air sensor senses discharge air temperature. If discharge air temperature drops below 62 F, the economizer modulates toward minimum position. At 50 F dis charge temperature, the economizer will be at mini mum position.

At the end of the DAY (OCCUPIED) mode on the clock, unit controls enter the NIGHT (UN

OCCUPIED) mode. Economizer closes. Indoor air fan runs only on a call for heating or cooling. Tem perature controls go into HEATING SETBACK,

COOLING SETUP or COOLING SHUTDOWN

mode.

HEATING SETBACK is field selectable at the unit for 5°, 10°, or 15° below set point on room thermostat.

COOLING SETUP is field selectable at the unit for 5°, 8°, or 12° above set point on room thermostat.

During the UNOCCUPIED mode, unit continues to use economizer cooling first and then integrates economizer cooling with mechanical cooling to meet cooling requirements.

A 5-hour bypass timer is located in the remote control box to provide air conditioning during

normally unoccupied hours.

TWO-SPEED INDOOR FAN OPTION — Table 1 lists the 2-speed indoor fan motor hp, frame size and shaft diameter. Due to the larger frame size, the

208/ 230-volt, 25-hp motors and all 30-hp motors are

available in single speed only.

The 2-speed motors are 2 winding (4 pole/6 pole)

design, with speeds of 1750/1170 rpm. Indoor fans

automatically operate at low speed until high speed is necessary to maintain comfort conditions. No field wiring or adjustment is necessary.

COOLING mode sequence of operation is out

lined in Table 4.

In HEATING mode, the indoor fan operates at

low speed for ventilation only, and operates at high

speed during active heating. A 2-heat/4-cool logic

panel provides the necessary fan control.

The circuit breakers, contactors, and relays re

quired for 2-speed motor control are located in the 2-speed indoor fan motor control box (Fig. 17).

POWER EXHAUST OPERATION — Units have an auxiliary switch located on the damper motor. This switch is factory set to prevent the power exhaust fans from operating when the economizer damper is less than 30% open.

If other than factory setting is desired, adjust

as follows:

Table 4 — Two-Speed Indoor Air Fan

Staging; Cooling Mode

ECONOMIZER COOLING (Enthalpy Permitting)

OPERATING

CONDITION

NO CALL FOR COOLING

(Ventilation Air)

CALL FOR

MINIMUM COOLING

STAGE 1 OF

LOGIC PANEL

(Economizer Cooling)

STAGE 2 OF

LOGIC PANEL

(Integrated Econ/Mech

Cooling)

STAGE 3 AND 4

OF LOGIC PANEL

(Integrated Econ/Mech

Cooling)

SPEED

ECONOMIZER

FAN

Low

High Full Open

High

High Full Open

DAMPER

POSITION

Minimum

Position

Modulating

Between

Min and

Full Open

COMPRESSOR

OPERATION

Off

Compr 1

Compr 1 and 2

MECHANICAL COOLING

(Enthalpy Not Permitting Economizer Cooling)

ECONOMIZER

OPERATING

CONDITION

NO CALL FOR COOLING

(Ventilation Air)

STAGE 1 OF

LOGIC PANEL

STAGE 2 OF

LOGIC PANEL

STAGE 3 OF

LOGIC PANEL

STAGE 4 OF

LOGIC PANEL

INDOOR FAN

FAN

SPEED

Low

High

DAMPER

POSITION

Minimum

Position

Minimum

Position

Minimum

Position

Minimum

Position

Minimum

Position

REMOTE CONTROL PANEL

COMPRESSOR

OPERATION

Compr 1

Compr 1 and 2

Off *

Off

Fig. 17 — Two-Speed Fan Control Box

Location

NOTE: Adjustment does not require running the motor.

1. Motor must be in the fully closed position.

2. Referring to Fig. 18, take off “C” clip and drive bracket. Remove screws at 4 corners of housing.

Pull off return spring housing.

3. Remove spring on motor shaft.

4. Adjust switch as shown in Fig. 19.

5. After adjustment, replace spring on motor shaft and reassemble return spring housing.

Fig. 18 — Removing Return Spring

Mechanism

STARTING POSITON

NOTE POSITION

OF RED DOT

CENTERLINE

Each adjustment mark repre sents 10 degrees of motor rota tion Use marks and center of cam roller as adjustment guide

Red dot will be to right of centerline if switch is properly adjusted

Fig. 19

Adjusting Switch Make and

Break Points

ADJUST CAMS

OPERATIONAL

Loosen operational cam adjust ment screw Rotate both cams clockwise the number of de grees motor must travel before switch makes Tighten screw

CAPACITY CONTROL, HEATING — Stages 1 and 2 of heaters are controlled by heating relays HRl and HR2, respectively. Using a suitable ammeter, check heater current draw for heating assemblies or elements. When checking secondstage heater operation, be sure heating thermostat is set high enough to activate second-stage heaters.

Also, check operation of outdoor air thermostats if

additional staging is provided.

Modu-Pac® Variable Volume Units — Units

suitable for use with Modu-Pac variable air volume systems (i.e. Carrier 37 Series terminal units) are equipped with electric unloaders on the no. 1 com pressor and hot gas bypass on the no. 1 refrigerant system.

Before starting unit, open compressor service valves and liquid line shutoff valve. Be sure com pressor crankcase heaters are on and crankcase oil level is half full. See Compressor and Crankcase

Heaters as applicable.

CONTROL SEQUENCE CHECKOUT

1. Turn on unit main power supply. Be sure unit is ready to operate. Turn off compressor circuit breakers.

2. Set the control band knob (Fig. 12) on micro processor to 8° (50DL044) or 6° (50DL054,064).

3. If unit is not in DAY (OCCUPIED) mode, turn on unit by overriding time clock with manual bypass switch on remote box cover.

4. To check for cooling, turn set point knob (Fig. 14) on microprocessor to 40 F. As cor responding stage of cooling come on, the LED’s should glow. Indicator light, located on remote box cover, should also be lit.

5. Turn set point knob on microprocessor to 90 F. The LED’s on microprocessor should go out as corresponding stages turn off (providing ambient temperature is below 90 F).

6. To check for heating on units with electric heat, set morning warmup thermostat (Fig. 12), located in variable volume box, to its maximum position. If return air temperature is below the set point, first stage of heat should come on. The outdoor dampers should be tightly closed. Light marked HEATING on the cover of remote box should come on. NOTE: If unit has been in cool ing mode, it will be necessary to shut off unit power momentarily in order to check out heating

mode; once unit goes into cooling mode, a hold

ing relay locks out heating mode.

7. The morning warmup thermostat is a 2-stage device. When first stage is satisfied, control shuts

down electric heat (if used). An adjustable dead band of 3F to 10 F exists between first and second stage. In the deadband zone, indoor air fan runs but cooling mode will not begin until return air temperature exceeds adjustable set point of the second stage. Note that the difference between heating and cooling set points will always be 3 F to 10 F.

8. When checkout is complete and unit operation is satisfactory, turn off bypass switch, position the set point knob on microprocessor to desired setting (approximately 55 F) and replace all unit panels.

ECONOMIZER OPERATION — Refer to Con

stant Volume Units, Economizer Operation. 7-DAY TIME CLOCK ADJUSTMENT

Setting ON and OFF Times (Fig. 20) — NOTE:

14 trippers (7 sets, one set for each day) are included. If more than 7 ON-OFF operations per week are required, additional trippers are needed.

1. To set ON (OCCUPIED) time, slip the ON tripper over edge of time dial and position at

desired day of the week and time of the day (AM or PM). (When switch is turned on, normally open contacts close and normally closed con tacts open.)

Fig. 20 — Setting the 7-Day Time Clock

NOTE: Dial turns clockwise when power is

connected and time clock is operating.

2. Hold tripper firmly against the edge of dial and tighten knurled screw by hand. (Do not use

pliers.)

3. To set OFF (UNOCCUPIED) operation, use OFF tripper and repeat steps 1 and 2, setting the time desired for the switeh to turn off. (Normally open contacts open and normally closed contacts close.)

4. Time cloek can be set for up to 3 ON-OFF oper ations per day or 21 per week. To omit operation, do not place trippers on the dial for that day(s).

NOTE: Minimum time from an ON operation to an

OFF operation is 3-1/2 hours.

Minimum time from an OFF operation to an ON

operation is 3-1/2 hours (limited by the width of the

trippers which cannot be set closer).

Setting the Time of Day (Fig. 20)

1. Apply power to timer motor.

2. Turn time dial clockwise until the TIME pointer is aligned with correct time and day. Do not

turn time dial counterclockwise and do not move the TIME pointer.

Time clock has a spring wound carryover me chanism to keep timer on schedule during power failure up to 10 hours. When power is restored, mechanism automatically rewinds.

VARIABLE VOLUME OPERATING SE QUENCE (with accessory electric heat) — Clock in remote control box switches controls to DAY (OCCUPIED) mode. Indoor air fan runs for one minute before any other control can function. (This allows sensing of unit discharge air to start from the

conditioned space ambient rather than initial unit

ambient.)

If return air is below adjustable set point of first stage of the morning warmup thermostat, heaters energize. Outdoor air dampers remain elosed. Normally open contacts in base unit override the field-supplied VAV terminal controls and room ter minals remain open during heating.

When first stage of morning warmup thermostat is satisfied, heaters shut down, indoor air fan runs eontinuously and outdoor air dampers remain closed.

When conditioned space temperature rises to adjustable set point of second stage of morning warmup thermostat, unit switches to COOLING mode. Outdoor air dampers go to at least the mini

mum position. (Once the unit has gone into cooling mode, heat cannot come on during OCCUPIED time period set on the clock.)

If outdoor air enthalpy is below setting of

enthalpy controller, economizer modulates open. (If outdoor air enthalpy is above enthalpy set point, economizer remains at minimum position.) Economizer acts as first stage of cooling, providing “free cooling” with outside air. If outside air alone eannot satisfy cooling requirements of the condi tioned space, economizer cooling is integrated with mechanical cooling.

Compressor(s) will start, stop, load and unload

and economizer will modulate to maintain an average discharge air temperature. If outside air temperature drops below the adjustable setting (normally 50 F) of the low ambient lockout, the compressor(s) will shut down.

At end of DAY (OCCUPIED) mode on the clock,

unit enters the NIGHT (UNOCCUPIED) mode.

The outdoor air damper closes and indoor fan and

compressors shut down.

If a field-supplied night thermostat is installed in the conditioned space, indoor air fan runs only on a call for heating or cooling. Dampers open only on a call for cooling. On a call for cooling, economizer cooling occurs first and then integrates with me chanical cooling to meet the cooling requirement.-

A 5-hour, manual bypass timer is provided in remote control box. This timer, when manually set by building occupant, overrides the UN OCCUPIED mode and places unit in OCCUPIED mode for up to 5 hours.

Constant and Variable Volume Units

TIME GUARD® CIRCUIT — Timer sequence for a particular unit depends on unit and com pressor arrangement. The Time Guard device pro vides a delay in compressor start-up after thermostat closes. On normal unit start-up, outdoor air fans energize 15 seconds before the compressor. If com pressor shutdown is due to satisfied thermostat or

automatic resetting of a safety device, the com-

pressor automatically restarts after a 5-minute inter val. If compressor shutdown is due to tripped over loads, the circuit breakers must be manually reset before compressor will start.

Timer (Time Guard®) for second compressor has a 6-minute interval to prevent compressors from starting simultaneously.

Refer to unit label diagram for specific timer

sequence.

CRANKCASE HEATER — Unit main power

supply must remain on to provide crankcase heater

operation. Crankcase heater in each compressor keeps oil free of refrigerant while compressor is off.

HEAD PRESSURE CONTROL — Each unit has a fan cycling thermostat to shut off 2 outdoor fan motors at 55 F. This permits unit to operate with correct condensing temperatures down to 35 F out door air temperature.

SERVICE

Electronic Component Checkout

CONSTANT VOLUME UNITS

The checkout procedures in this section will

determine whether;

1. The logic panel is controlling the heating and cooling equipment properly.

2. System components are correctly wired to the logic panel.

Prior to checking out control circuit, establish setting on the low ambient lockout thermostat. Compressors will not start below this setting (cool ing mode only). Recommended setting is approxi mately 50-55 F.

NOTE: To complete the electronic component checkout, a volt-ohmmeter (Simpson 260 is recommended) is required.

LOGIC PANEL (Fig. 21)

1. Check that 24 VAC is supplied to logic panel. Connect meter to terminals TR.

2. Check thermostat supply voltage at STAT ter minals 1 and 2. Reading should be 20 VDC.

3. Remove thermostat supply wires from STAT terminals 1 thru 5 on logic panel.

4. Set meter to volts AC scale equal to relay switch

ing voltage (50-volt scale for 24 VAC).

5. To simulate a call for cooling, jumper between

STAT terminals 2 and 4. Normally open Logic Panel contacts (Cool 1 and 2) should close and cooling equipment should cycle on.

6. Connect meter leads to the normally open cool ing contacts 1 and 2 on logic panel. Meter should

Fig. 21 — Logic Panel

read zero if contacts have closed and contacts are made.

If meter is reading zero and cooling equipment has not cycled on, logic panel is not at fault.

7. To simulate a call for heating, jumper between STAT terminals 2 and 5. Normally open logic panel contacts (HEAT 1 and 2) should close and heating equipment should cycle on.

8. Connect meter leads to the normally open heat ing contacts on logic panel. Meter should read zero if contacts have closed.

If meter is reading zero and heating equipment has not cycled on, logic panel is not at fault.

9. Replace thermostat wiring to terminals 1 thru 5.

DISCHARGE SENSOR

1. Set resistance on meter to R x 100.

2. Disconnect lead from SENSOR terminal T1 on logic panel.

3. Connect one meter lead to logic panel terminal T and the other meter lead to the loose lead wire from the sensor.

4. Meter readings depend on temperature. Dis charge sensor readings should be between 1500 and 4500 ohms. See Fig. 22.

THERMOSTAT/TRANSMITTER (Fig. 16)

1. Set meter to 20 VDC scale.

2. Check for power to thermostat. Connect negative (-) lead to terminal 1 and positive (+) lead to terminal 2. Meter should read 20 VDC.

3. Connect the negative (-) lead to terminal 1 and

the positive (+) lead to terminal 4.

4. Slowly move the cooling lever below room tem

perature to simulate a call for cooling. Meter

reading should gradually increase to about

16 VDC. (See Fig. 23.)

5. Move the cooling lever above room temperature. Meter reading should drop to less than 2 VDC.

6. Remove the (+) meter lead from terminal 4 and connect it to terminal 5.

7. Slowly move the heating lever above room tem perature to simulate a call for heating. Meter

5000 4800 4600 4400

4200

4000

3800

3600

3400

3200

3000 2800

2600

2400

2200

2000

1800

1600 1400

1200

1000

800 600 400

200

____ \

^30 OOnAT 77F( >50

60 65 70 75 80 85 90 95 100

(16) (18) (21) (24) (27) (29) (32) (35) (38)

TEMPERATURE DEGREES F (DEGREES C)

Fig. 22 — Resistance Range of

the Discharge Sensor

reading should gradually increase to about

16 VDC. (See Fig. 23.)

8. Move the heating lever below room temperature. The meter reading should drop to less than 2 VDC.

ECONOMIZER (Motor Operation) — Check to

see 115 V is at the economizer motor. Remove wire

from the W terminal on damper motor. Dampers should go fully open.

Short between R-W on motorterminals. Dampers

should go fully closed.

Logic Panel Economizer Signal

1. Disconnect terminal W on logic panel.

2. Connect meter (2.5 VDC scale) with negative (-)

lead to R and the positive (+) lead to W.

3. Set thermostat for a call for cooling. Meter

reading should rise to 1.5 VDC. If thermostat

was already calling for cooling, reading will be

1.5 V when meter is connected.

4. Turn thermostat up so that no cooling is called for. Voltage should fall from 1.5 VDC to 0.

Conduct the above test with air temperature at the discharge sensor (located at unit air dis charge) above 62 F. If air is below 50 F, there will be no voltage signal. If air is between 50 F and 62 F, voltage will be in the same proportions.

VOLTAGES NECESSARY TO ACTIVATE LOGIC PANEL HEAT STAGE

1 2

Differential: 63 +

VOLT DC

4 63 1 5 88

07 volts

COOL STAGE

Tolerance: i 25 volts

Fig. 23 — Thermostat/Transmitter

Output Voltage Ramps

VOLT DC

5 00 5 88

Cleaning — Inspect unit interior at the beginning

of each heating and cooling season and during each season as operating conditions require. Remove unit top panel(s) and/ or side panels as required to expose unit interior.

EVAPORATOR COILS — Clean with a stiff brush, vacuum cleaner or compressed air.

CONDENSER COILS — Clean with a stiff brush or vacuum cleaner. When cleaning with compressed air or low-pressure water or steam, guard against damaging compressor wiring and nearby controls. Condenser fan motor(s) is drip-proof but not waterproof.

CONDENSER SECTION DRAIN — Check that area under coil is clear and drains freely.

CONDENSATE DRAIN — Check and clean annually at start of cooling season. In winter, keep drain and trap dry or protect against freeze-up.

FILTERS — Replace filters at start of each heating

and cooling season or as often as necessary during

each season, depending on operating conditions.

Refer to Table 1 for type and size of filter used.

Filter access panels are shown in Fig. 4. Return air filter tracks will accept 2 layers of 1-in. thick filters if 2-in. filters are not available. Do not install bag filters in standard filter tracks. Do not install

standard filters or 2-in. high-efficiency filters in bag filter tracks.

OUTDOOR AIR INLET SCREEN(S) -- Clean screens with steam or hot water and mild detergent. Do not use throwaway filter in place of these screens. Loosen fastening-bracket screws and slide out screens.

Lubrication

COMPRESSORS — Each compressor is charged with correct amount of oil at the factory. Oil level should be between bottom and mid-level of sight glass when compressor is warm. Refer to 06D or 06E Compressor Service Manual if additional infor mation regarding compressor lubrication system is required.

FAN SHAFT BEARINGS — Charge each grease fitting with a suitable bearing grease at least once a year. Do not overlubricate.

FAN MOTOR BEARINGS — No relubrication of outdoor air fan motors is necessary for first 2 to 5 years of use, depending on operating conditions. Annually thereafter, open, clean and repack each bearing with a suitable bearing grease.

Indoor air fan motor bearings should be cleaned and repacked with a suitable bearing grease annually after initial unit installation.

Power Exhaust Air Fan Adjustment (if fitted) —

Adjust belt tension so that 1/8-in. deflection at 5-to 8-pounds pressure between pulley centers can be obtained. To change tension, loosen motor mount ing bolts, reposition motor and tighten mounting

bolts. Tighten locknut and bolt under motor mounting plate to secure in fixed position.

Outdoor (Condenser) Air Fan Adjustment

(Fig. 24) — Shut off unit power supply. Remove fan guard and loosen fan hub setscrews. Adjust fan height using a straight edge laid across venturi. Tighten setscrews and replace rubber hubcap to prevent hub from rusting to motor shaft. Fill hub

‘recess with permagum if hub has no rubber hubcap.

Damper Vent Position Setting

1. On constant volume units, adjust thermostat or transmitter so there is no call for cooling. On variable volume units, adjust set point knob on

microprocessor so there is no call for cooling. The economizer dampers go to minimum position.

2. Remove cap from vent adjustment screw on top of damper motor terminal box cover.

3. Turn adjustment screw slowly until dampers assume desired vent position. Do not manually

operate damper motor. Damage to motor will result.

POWER FAILURE — Dampers have a spring re

turn. In the event of a loss of power, dampers close

until power is restored. Do not manually operate

damper motor. Damage to motor will result.

Fig. 24 — Outdoor Air Fan Adjustment

Refrigerant Charge — Amount of refrigerant

charge is shown on unit nameplate and in Table 1. When charging refrigerant system, refer to Carrier Standard Service Techniques Manual, Chapter 1,

Refrigerants. When adding a complete charge, evacuate the system using standard evacuating pro cedures and weigh in specified amount of refrig erant. A charging chart (Fig. 25, 26, and 27) is pro vided on unit control box door above compressor and may be used (use of sight glass not required).

When using refrigerant liquid line sight glass to

charge system:

1. Install a jumper on the low-pressure switch if required.

2. Operate unit with restricted condenser airflow to achieve an operating discharge pressure of about 375 psig.

3. Slowly add refrigerant until sight glass clears.

4. Remove jumper from low-pressure switch and remove condenser air restriction.

Indoor Air Fan Adjustment — Fixed fan speeds

are set as shown in Table 1. If other than available fan speeds are required, select field-supplied motor or pulleys, using data from Tables 5 and 6, and

Fig. 28 and 29. PULLEY REMOVAL — Pulleys are of the fixed

type and have taper-lock bushings. To remove, shut off unit power. Loosen fan motor mounting plate and remove belt. Relocate taper-lock bushing bolts in removal holes to loosen bushing. Remove pulley from shaft.

After reinstalling pulley and belt, check pulley

alignment and belt tension as described below.

PULLEY ALIGNMENT — Loosen fan shaft pulley bushing and slide pulley along shaft. Make angular adjustment by loosening motor mounting plate and repositioning it as required.

BELT TENSION — Adjust belt tension by moving motor back until only a slight bow appears in the belts on the slack side of the drive while running under full load. Secure motor. Recheck belt tension after 24 hours of operation, adjust as necessary.

COMPRESSOR SUCTION PRESSURE

Fig. 27 — Charging Chart; 50DL064, System 1 and System 2

Table 5 — Indoor Air Fan Pulley Data

UNIT 50DL

MOTOR

FAN

PULLEY

RPM

No Grooves - Type - In.

i 991Ì3-3V-6.0 ! 3-3V-10.6 ! 3-3V-750 I3-3V-770

044 ! 1093 Ì4-3V-50 i 4-3V- 8.0 l’4-3V.710j 4-3yj^710

! 1039 Ì5-3V-4.75Ì 5-3V- 8.0 Ì5-3V-710 Ì

054 ^

1093 i s-3V-5.0 ! 5-3V- 8.0I5-3V-710

FAN

PULLEY

SINGLE

SPEED

BELT

NO.-SIZE

-------------------

0 Ì4-3V-710

TWO-

SPEED

BELT

NO - SIZE

mmmm

825 4 -3V- 5 6 991 4 -3V- 6 0

5-3V-475 5-3V- 80

1039

4 - 3V- 6 5 4-3V-106

1073 1093

064

5 -3V - 5 0

1159 5-3V-5.3 5-3V- 8.0

■ •iSSSewH

4 - 3V - 10 6 4-3V-750 4-3V-106 4 - 3V - 750

5-3V- 80

5-3V-710 5-3V-710 4 - 3V - 750 5-3V-710 5-3V-710 5 • 3V - 720

WW«?KSS¥Sw!

Shaded values indicate standard or optional pulley available as shown in Physical Data table All other are field supplied

•Three belts are required. 4 may be used if desired tRemove one belt

4 - 3V- 750 4 - 3V - 770

4 - 3V - 770 5 • 3V - 720

combinations

Table 6 — Indoor Air Fan Data

UNIT

50DL

054, 064

CFM

8,000 467 1 22 546 1 61 628

9,000 508 1 65 575 10,000 11,000 12,000 642 3 60 688 4 00 738 4 48 791 5 07 847 5 78 902

13,000 689 4 52 730 4 93

044

14,000 15,000 783 6 79 818 7 24 855 7 74 16,000 831 8 18 17,000 879

18,000 927 11 52 956

19.000

20.000 10,000

11,000 519 1 90 601 2 30 679 2 84 750 12,000 554 13,000 590 3 04 14,000

15,000 1 6,000 17,000 18,000 780 7 83 820 8 09 19,000

20,000 859 10 69 21,000 22,000 938 23,000 978 16 18 24,000 1018

0.20

Rpm Bhp Rpm

552

2 18 609

596

2 83 648

736

5 57

9 75 910 10 24 941

976

13 48 15 67

1024

487

1 47 577 1 89 659 2 40 733 2 42

627 3 76 684 664 4 59 716 4 87 775 5 34

703 5 54 750 741 6 62 785 6 88

819 9 19 857 9 45

12 35 932 12 62 967

898

14 18

18 36 1047 18 64 1076

0 40

Bhp

2 02 649 2 54 2 56 674 3 06

3.21 704 3 70

774

6 00

864

8 65 898 9 17 933 9 74 971

12 03 14 02

1003

16 23

1050

626 2 77 702 3 34 654

3 35 4 05

5 81

894

10 95

970 14 45 1003 14 78

16 45 1040

1008

0.60 0.80

Rpm

775 814

986 12 58 1016 1031 1076

724

749

803

833 7 28 886

865

898 9 81 943

932

EXTERNAL STATIC PRESSURE (in. wg)

Bhp

Rpm Bhp Rpm Bhp

2 12 705

5 41 6 49

10 78

14 59 16 82

3 92 4 58 813

6 24 860

8 47 914

11 30 12 96

16 78 1073 18 97

2 66 774

721

3 14 789 3 75 852

741

3 67

764

4 32

822

5 98 873

857 7 06

8 31

894 974 11 36

1059 1103

770 3 95 791 4 57 852

836 6 02

973 11 77 1005 1039 15 21

1108

1008

13 18 1048 13 83 15 21

1089

17 45

1131

2 99 802 3 42 817

5 25

6 90 7 88 9 01

10 31

1018 1241 1064

13 40 1047

1077

17 20

1109 17 72

19 38 1141

806 825 5 01 883 5 75

902 7 72 935 8 96

833 4 62

873 5 96 894 6 77

917 7 66 940 965 9 77

991 11 00

3 24

4 35 867

6 68 924 7 46

10 38 12 00 1044

15 86 18 12

3 60

4 09 879 4 76 935

5 23

8 66 993

13 99 15 76

19 88 1177

1.20 1.

Rpm Bhp

839 3 85

949 978

11 11 1050

1009

12 72 1081 13 51 14 54

1081 1119

16 58 18 84

1159

863 4 21 922

895 910 5 97 967 6 77 928 6 69 982

949 970

1016 10 62 1039 11 86

13 24 14 76 1134

1090

16 47

1118 1146 18 38

20 50 1214 21 26

Rpm Bhp

900 4 47 4 40 911 5 03 924

6 54

8 51 9 70 1022

5 35

7 52 8 47 9 49 1042

5 08 967 5 73

939

6 50

956 7 35

975

8 28 1025

997

9 35 1045 10 57 1067 11 93

1115 15 31 1150 16 17

1151

17 35 19 61

1189

4 86 977 5 58

5 42

952

6 08 1003 6 79

7 49

1000 8 32 1051 9 18

1021

9 27 1069 10 12 10 35 1089 11.21 1134

1064

11 51 1110 12 42

1087

12 78

1110 14 17

15 70 17 35

1159

1186

19.20 1226 20 20 1266 21 27

Rpm Bhp

956

5 09 5 77

978

6 48

992

7 26

1008

8 17

9 15 1074^ 10 23 11 47 12 86 1134

1092 1119 14 40

1183 18 19

6 11

989

1020 7 57 1035 8 35

1132

13 74

1155 15 14 1178 16 69

1201 18 37

1252 22 19

1.80 Rpm Bhp 1010 5 72

1020 6 46

1031

7 24 1043 8.06 1057

8 99

10 04

1091

11 17

1111

12 40 13 82

1159

15 40

1186

17 12

1217

19 10

1030

6 27 1041

6 88 1054

7 54 1069

8 33

9 21

1085 1100 10 11

1116 11 05

12 11

1155

13 33

1176

14 69

1197 16 16 1220 17 72 1243 19 42

1290 23 28

UNIT

50DL

Bhp — Brake horsepower Rpm — Revolutions per minute

CFM 2.00 2.20 2.40

Rpm Bhp Rpm Bhp Rpm Bhp

6 37 1110 7 04 1155

1061

8,000

1070 7 15

9,000 10,000 11,000 1 2,000

1 3,000

044

14,000 1 5,000 1 6,000 1 7,000

18,000

19.000

20.000 10,000

11,000 1090 7 67 1138 1 2,000

13,000

14,000

15,000 1148

16,000

054,

1 7,000 1178

064

18,000

19,000 20,000

21,000 1260 22,000 1283 20 51 23,000 1306 24,000 1329 24 39

1081 8 01 1128 1091 8 89 1139 9 73 1105 9 84 1150

1120 10 93

12 12

1137 1155 13 40 1198 1176 14 80 1198 1641 1238 17 45

1224 18 18 1261 19 25

1078 6 91 1125 7 63 1169

1102 8 33 1116 9 12 1132 10 05 1175

11 03 1193

1162 12 03 1208 13 01

13 09 1222 1197 14 29 1239 1218 15 65 1258

1239 17 17 1279 18 18

18 79 1300

22 38 1344 23 52

EXTERNAL STATIC PRESSURE (in. wg)

2.60

Rpm Bhp

7 87 1164

1118

8 78

10 72

1165

11 82 1208 12 76

1181 13 08 1223 14 04

14 42

1217 15 85 1257

8 43 1181

1149

9 18

1161 9 94 1206

10 88 11 94

14 13 1266 15 31 1281 16 40 16 66 1297 17 72

19 85 1338

1321 21 63 1359 22 74

1367 25 55 1403 26 75

NOTES 1 Fan performance has deductions for unit casing losses, wet coil and clean standard filters

7 69 1201

8 57 1173 9 54 1184

10 57

1195 11 63

1240 15 44

16 93 1297

1277

18 54

8 35 1210

9 12 1225

1194

10 05 1237 10 83 1249

1219 11 75 1234

12 81

1251

13 99 1291 15 17 1307

1317

19 23 1354 20 90 1375 22 01

24 69

1380

2 Fan motor bhp is based on minimum voltages and 80 F air access motor 3 Consult physical data and indoor air fan pulley data.for appropriate motor and pulleysizes with

corresponding rpm

4 For rpm's outside of published data, field-supplied drive may be required

8 38 1245

1209

9 33 1252 1218 10 34 1228 11 43

1238 12 55 1250

13 72

1264

15 00

1280

16 48 18 03

9 10

9 90 1266

10 87 11 76

1260 12 64 1275 13 72

14 95 16 22

1322

17 51

1337

18 85 20 33

1395

23 84

1416

25 85

1438

27 98

2.80

Rpm

Bhp

9 09

10 08

1260

11 13 1269 12 25 1280 13 46

1291

14 70

1253

9 89 1293

10 70 1303 11 50 1278 11 64 1290

12 70 1302

13 60 1342 1315 14 66

1329 15 87 1347

17 25 1362

18 61 1400 19 72 1376

20 02 1392

21 50 1410 23 14 1431

24 99

3 00

Rpm Bhp Rpm

1332

10 71

1318 12 45 1356 1330 13 60

1354 15 63 1368 16 86 1384

1415 21 19 1430

1446

1342 1369 14 45 1405

14 61

1380 1392

1405 17 87 1441 18 89

18 25 1419 19 24

1437

22 73 24 35

3.20 3.40 Bhp Rpm Bhp

1371

11 52 12 34 1380 13 22 13 32 1393 14 19

15 62

1418 16 60

16 66

1429 17 73

20 80

12 37

15 27

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CÛO

0_-'

>—t) h-O

<-■

со

—^

N .

-V,

s. Ч

N ,

\. ;

ib-

яг

¿.с

12n

'S N_

iv-

\ 1

!.,

го

S. X

МАХ RPM“ МОО MIN RPM' 800 INCR RPM' 100 MIN НР = 2 МАХ НР= 25

CFMdOOO S) (STD AIR)

Fig. 28 — 50DL044 Indoor Air Fan Data

rO cn

3 Q.

Q. — O °

■b O

CO —)

TOTAL STATIC PRESSURE IN WG

TOTAL STATIC PRESSURE IN WG *10

-3

::o

For replacement items use Carrier Specified Parts

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

Book 1

Tab

Form50DL-1SI New

Printed in U S A

288

6-83 PC 111 Catalog No 565-020

Carrier 50DL User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual