Carrier 09DC User Manual

Download

Page 1

Carrier

: .¿'K 5:-K , w

ci"' i/''

s io 80 Tons

9AB,09DC

DESCRIPTION

Capacities to 10 Tons

9AB Air-Cooled Condensers available in nominal capacities of 5, 7% and 10 tons are designed for verti cal installations with horizontal air flow. They may be located in any area having unobstructed air circula tion; the low silhouette permits installation in varied ground or roof locations. Each unit consists of a direct drive motor (or motors), fan (or fans), fan guards, motor mounts, condenser coil with integral subcooling circuit, wind deflector, and electrical junction box.

Weather Armor* enclosures (which are also provided

for 09DC016) have a baked enamel finish which pro vides maximum weather protection.

FEATURES

• Multiple Fans and Motors provide inexpensive, re liable system control in intermediate seasons. Standby protection is provided in case one fan motor fails.

• Subcooling permits greater liquid lift in vertical

risers without liquid flashing. Special coil circuiting cools liquid refrigerant below the saturated condensing temperature, extending system capacity without in creasing motor horsepower.

• Direct Drive Fans require no tensioning device or

pulleys. Alignment problems, belt maintenance, and friction loss are eliminated.

• Three Types of Head Pressure Control (Accessory)

are available to maintain a refrigeration load by hold-

Air-Cooled Condensers

Capacities 15 Tons and Over

09DC Air-Cooled Condensers are available in 15-, 20-, 25-, 30- and 40-ton sizes. The 25-, 30- and 40-ton sizes are designed for use in multiples to give capacities of 50, 60 and 80 tons. Each size has three direct drive fans, three motors and motor mounts, three guards, a junction box, and a condenser coil with integral sub cooling circuit. The 20-, 25-, 30- and 40-ton units, all using vertical air flow, may have 2 or 3 circuits, each with an integral subcooling circuit. Each circuit may be used as a separate condenser for a single system. Double-weight, hot dipped, galvanized steel enclosures give maximum protection.

ing a minimum head pressure and reducing condenser capacity at low outdoor temperatures.

1. Motormaster Electronic Control (9AB6, 8, 12 and 09DC016, single-phase) modulates condenser fan motor speed from zero to full rpm.

2. Fan Cycling Control cycles one fan (9AB8, 12) or two fans (09DC) for control during intermediate seasons.

3. Head Pressure Control Damper (09DC024, 084), mounted below unit at the uncontrolled fan section,

further reduces capacity.

• Winter Start Control — Optional package permits start-up of compressor regardless of low temperatures.

•SINGLE FEATURE SHEET AVAILABLE

Form 9AB, 09DC-2P

Page 2

PHYSICAL DATA

UNIT

RATING (tons)* NET WEIGHT (lb)t

FAN (Prop.), No.

Prop. Diom (in.) Rpm Cfm

MOTORS, No. ... Hp

COILS, Type

No. Face Area (sq ft)

DIMENSIONS (ft-in.)

Length (each) A Width (module) B

Height, w/o Legs Adj Stand (in.) D

9 AB

6 8 12 016

6.8 10.5 13.8

215 315

1120

410

2 2 3

22 22

1 120

1120

4400 6600 8800

2...Vs 2... Vs

1.. Vs 3-row

9 0

3-7Vs 5-2 Vs

13 5

18 0

6-8Vs

3-1 Vs 3-1 Vs 3-1 Vs

3-2Vi6

lOV or

3-2 Vs

3-2Vs

16 V.

09DC

024

15.8

22.1

550 854

028

28.0 904

3 3

22 26

1120

13,000

3...V

1140

18,200 25,200

3...%

1140 1140

3 . 1

3-row

26.2 35.4 39 0 49.6

6-9Vs 4-6 V.

9- 7% 9- 1% 9- 7V. 3-1IV.

3-1IV. 4-lOV.

1-8V. 2- 4 Vs 2- 4 Vs

12Vsor 19Vs 16 or 24

16 or 24

09DC054

034 044

35.8 46.7 56.0

1225

1600

3 3 6

30 32 30

1140 1140 1140

28,200 31,000

3...1 3...1 4-row

60.4 78 0 99 2

9-lOV. 9-lOVst

6- OV. 3-1IV.

3- iVs

18 or 26 20 or 28

3- r/s

16 or 24 18 or 26

(T wo

028’s)

(Two

034*s)

71.7

09DC064

1808

2450

6 6

50,400 56,400

6...1

3-row

9- 1% 9- 7%

4-lOV.

2- 4 Vs

3- iVs 3- r/s

09DC084

(Two

044’s)

93.4

3200

1140

62,000

6...1 4-row

120.8

9-lOV. 9-lOVst

6- OV.

20 or 28

Data common to 1- and 2-module units.

*Tons of refrig effect at 30 F temp diff with 1 20 compr heat rejec

tion factor for R-22. tWithout damper or refrigerant. iFor three-circuit coil.

DIMENSIONS

9AB6,8,12 09DC016, 024, 028,

034, 044

5/„ ODF LIQUID OUTLET

“ (09DC0I6 ONLY)

AIR FLOW

ELECTRICAL KNOCKOUT

OUTLET

'''a' ODE

S3 SPACE FOR AIR FLOW

**Use 50/50 split for single circuit. 09DC034 coil 40/40/20 split

may be field modified into 40/60 split.

tt80% liquid, 20% vapor at 90 F.

NOTES:

1. For 09DC024 thru 084, use maximum adjustable stand height when using a damper section.

2. Certified dimension drawings available on request.

024,028.034,044

50/50

COIL SPLIT

1/2-024,028

7/"-034, 044

024,028

63/37

COIL SPLIT

ODF

RIGHT END VIEWS

7/^' ODF Vg" ODF

034

40/40/20

COIL SPLIT

044

38/38/24

COIL SPLIT

7/g ODF

Page 3

CONDENSER RATINGS TYPICAL ARRANGEMENTS

(Two-Module Condensers)

la. Select minimum or optimum charge ratings.

Use optimum charge when compressor, condenser, and evaporator may be selected as a package and the com ponents may be balanced* to secure maximum benefits of 15 F subcooling (for example, in selecting 09DC con densers with Carrier compressors rated at 15 F sub cooling). Optimum charge activates the subcooling circuit, resulting in higher system capacity at slightly higher head pressure and corresponding condensing temperature. Liquid refrigerant leaves the system sub cooled to a stable condition to allow greater length of

refrigerant run or lift.

Otherwise, use minimum charge which gives higher heaf rejection, since entire surface of condenser and sub cooling circuit is used for condensing only. Minimum charge ratings, however, do not represent greatest po tential system capacity. They are comparable to com petitive ratings without subcooling.

b. List the refrigerant, total heat rejection (THR), suction

and discharge temperatures as determined from com pressor data.

2. Determine condensing temperature (saturated discharge temperature minus discharge line loss).

3. Determine temperature difference (condensing tempera ture minus entering air temp).

4. Enter Condenser Ratings table (minimum or optimum charge as determined in Step 1) at selected refrigerant and established temperature difference. Read across to total heat rejection equal to or greater than required.

Interpolate if necessary. Read unit size.

Example (Optimum Charge)

1. Given: R-22, Optimum Charge THR (including subcooling)

Saturated Disch Temp................................................................................123.8 F

Saturated Suction Temp..................................................................................40 F

Entering Air Temp............................................................................................95 F

Disch Line Loss.................................................................................................2 F

2. CondTemp^ 123.8F-2F= 121.8F

3. TD = 121.8F-95F- 26.8 F

4. Interpolate in Condenser Ratings table (optimum charge) and obtain capacity of 09DC028 as 30,0 tons and 09DC024 as 23.6 tons. Select the 09DC028.

..........................................................

29.4 Tons

Example (Minimum Charge)

1. Given: R-12, Minimum Charge THR . . ■

....................................................................................

Saturated Disch Temp...................................................................................122 F

Saturated Suction Temp..................................................................................40 F

Entering Air Temp...........................................................................................95 F

Disch Line Loss ............................................................................................2 F

2. Cond Temp = 122 F-2 F - 120 F

3. TD= 120 F-95 F-25 F

4. Enter Condenser Ratings table (minimum charge) and select 09DC016 with 15,2 tons THR. (Note that with optimum charge this unit has THR of 14.8 tons which does not meet specifications).

*See Carrier System Design Manual.

15.0 Tons

Page 4

HEAD PRESSURE CONTROL

General — Efficient operation of evaporator expansion

valves requires a 90 F minimum condensing temperature for

100% compressor capacity, 80 F for 75% capacity, and 70 F for 50% and 25% capacity. The capacity of an air-cooled condenser increases with increased temperature difference (cond temp minus entering air temp) and decreases with decreased temperature difference. Therefore, a drop in en tering air temperature lowers the condensing temperature for a given heat rejection. When outdoor air temperatures drop below prescribed minimums, some form of head pres sure control is required. (See Head Pressure Control Data table for minimum outdoor temperatures and specific head pressure controls for 9AB and 09DC units.)

9AB, 09DC Head Pressure Controls — Head pressure on

9AB and 09DC condensers may be controlled by the Motor-

master Electronic Control, by fan cycling, or by fan cycling

supplemented by the Motormaster or a modulating damper.

Motormaster — When outdoor temperatures are low enough

to cause low condensing pressures, the Motormaster modu

lates the motor speed of one condenser fan from full to zero rpm to maintain a constant saturated condensing tempera ture. The Motormaster, available only with single-phase

motors (on unit sizes thru 09DC016), may be the sole con trol on single fan units or may be used in conjunction with fan cycling control on multiple fan units for full year-round head pressure control.

Fan Cycling — The fan cycling control, used primarily during intermediate seasons, cycles one fan or two fans. On two-module condensers (09DC034, 064, 024), the fan cycling control cycles four of the six condenser fans (two

of three in each module) from a two-step thermostat respond

ing to variations in ambient temperature. The first step of

the thermostat cuts out two corresponding fan motors, one in each module; the second step cuts out a second pair of cor

responding fan motors. The two condenser modules are controlled from a single, completely wired fan cycling con

trol box consisting of one two-stage thermostat, one power and one control terminal block, and two quick-connect re ceptacles (one at the end of a 10-foot flexible conduit).

HEAD PRESSURE CONTROL DATA

HEAD

UNIT

SIZES

All

9AB6 Motormaster

^ABS,Ï2

9AB8,12

024j,028,

OH 044i

09DC016

09DC024, 028, 034,

044t

PRESSURE

CONTROL

Far\

Ort i'<>>

Fan Cycling,

One Fan with

Motormaster

Tw«^ FiTK,

Fan Cycl ing,

Two Fans with

Motormaster

Fan Cyc 1 ing,

With Mod Damper

Winter Season

None

С/с''в^ j,

Two Fans

30 25 20

3Q 2S 20 :

30 25 20

: 30 : 25

ГС

30 25 20

25 20

TD - Temperature Diff (cond temp minus ent air temp)

* Interpolation permitted. t Based on 90 F minimum cond temp at 100% capacity, 80 F at 75%

and 70 F at 50% and 25%. (Motormaster holds cond temp to 100 ±

10 F at all loads and at temperatures down to -20 F.) On some ap plications with multiple DX coils, the compressor may be unloaded while individual coil(s) are still fully loaded. In this case, expan sion valve selection must be based on condensing temperatures

listed, or the minimum outdoor air temperature must be raised by the difference between listed cond temp and cond temp used for valve selection.

t Applied also to each module of 09DC054, 064 and 084.

COMPR CAP. (%)*

100 75 50 25

Min Outdoor Temp (F)t

57 61 65

-20 -20

! m

55 57 60

60 65 70

-20

1 S3 i

-20 -20

1 4'i

-20 -20

-20-213

62 64 65

-20

'S3

43 S2 SS

SCHEMATIC WIRING DIAGRAM

— CONDENSER CONTROL

(Single Refrigerant Circuit, Single Phase)

Head Pressure Control Damper — An accessory head pressure control damper is available to supplement the fan cycling control on the 09DC024 and larger units. The 09DC054, 064, and 084 require two damper packages in stalled for parallel throttling of air to the two uncontrolled fans. Each damper assembly has a pressure-operated actu ator to operate the damper blades which modulate inlet air flow to the uncontrolled fan in response to head pressure variations. The pressure sensing tubing (capillary) for both pressure actuators is connected to the same point in the

liquid line serving the last refrigerant circuit to shut down. Each capillary is provided with a 1/4-inch flare connection. A single shut-off valve at the liquid line is recommended, for service.

Multiple Circuit Condensers — Multiple circuit conden

sers applied to separate refrigeration cycles present special problems when head pressure is controlled from a single control point. For such applications, more positive system control may be ensured by using individual condensers and

head pressure controls.

LP — Low Pressure Switch ^ HP — High Pressure Switch

NOTES:

1. For three-phase service, holding coils are wired in parallel.

2. Multicircuit units may be similarly controlled by wiring fan motor holding coil(s) in series with thermostat, compressor overloads, and low pressurestat of each refrigerant circuit

3. Two or more condensers, piped in parallel on a single refrig erant circuit, must be of equal size and wired in parallel.

Page 5

SCHEMATIC WIRING —HEAD PRESSURE CONTROL

ТШЙЙОЗТЙТ i i

COMMON FOR

ALL WIRING

JiNTERLOCKED

[FC

[with СОМРЙ

■9AB WITH MOTORMASTER

,^5-9AB8,12 fan cycling ONE FAN / MOTORMASTER iSl+m - 09DC0I6 FAN CYCLING TWO FANS/MOTORMASTER

CONTROL TERMINAL BLOCK (FAN CYCLING CONTROL BOX)

2-STAGE

THERMOSTAT

FAN CYCLING TWO FANS (EACH MODULE) 09DC0I6, 024.028,034,044

QUICK-CONNECT

INTERLOCKED WITH COMPR

BULB

LOCATED IN AIRSTREAM

OF FM|

PLUG -Л

208/230/ i

TO fUSED DISCONNECT

3-PHASE POWER

TO FUSED DISCONNECT

FC| [

FM|)

" ; 1

____

FM,

___

1 i u

FC2

FC3

'I'

POWER

TERMINAL

BLOCK

(FAN CYCLING CONTROL

BOX)

QUICK-CONNECT_J

PLUG

FM|

(FM^

(FM3,

“i±:

TO FUSED DISCONNECT

_FLEXIBLE

CONDUIT

(PART OF

FAN CYCLING

CONTROL BOX

PACKAGE)

208/230 V

LEGEND

— Fan Contactor — Fan Motor

Ad(d this wiring for 054,064,084

TYPICAL PIPING AND WIRING CONNECTIONS (09DC Units shown)

l-CIRCUIT

FUSED DISCONNECT SWITCHES

FROM POWER SOURCE

3 WIRES (Зф) OIG, _

024,028,034,044

2 WIRES(lф)OI6

NOTES:

1. Single-phase motors (9AB, 09DC016) require one field-supplied contactor to start all fans. Three-phase motors (09DC016, 024,

028, 034 and 044) require one field-supplied contactor for each fan unless supplied with accessory fan cycling control.

2. All pip ing between two mocdule units is fielid supplied.

3. Wiring and piping shown are general points-of-connection guides only and do not include detai is required for specific instaI lotions,

4. All wiring must comply with appl ¡cable notional and local codes.

HOT GAS

2-CIRCUIT

ACCESSORY FAN

CYCLING CONTROL

(INCLUDES CONTACTORS;

THREE-PHASE)

JUNCTION BOX

LIQUID TO EVAPORATOR

WIRE AS IN EITHER OF ABOVE DIAGRAMS

3-ClRCUIT

ACCESSORY DAMPER

SECTION 024, 028, 034

LIQUID

All piping must follow standard refrigerant piping practices. Piping to two-module units (09DC054, 064 and 084) should

follow standard proctice for multiple condensers. See Carrier

System Design Manual for details.

For pressure relief requirements, see latest revision of Safety

Code for Mechanical Refrigeration - ASA-B9 1.

AND 044 (USE ONLY WITH

FAN CYCLING CONTROL)

Page 6

ELECTRICAL DATA (60-cycle)

UNIT

9AB6

9AB8

9AB12

09DC016

09DC024

VOLTS

208/230 208/230

208/230

460 575

208 230 3 460

575 208 3

PHASE

09DC028, 230 3 034, 044

460 575 3

1 2 1

1 1

3 3 1.0

3 4 0

3 3 1.6

FANS FLA

No.

T otal

T Ota 1

T otal

1 1

(ea)

2 1*

2.1*

2.4

2.1*

2 4

V3 3 3*

4 0

1 2

3 8

1.9

5 3

4 8

2 4

1 9

FLA - Full Load Amps

*These are special motors suitable for use with Motormaster head pres

sure control.

NOTE: All 208/230-volt single-phase units are suitable for operation on either voltage.

GUIDE SPECIFICATIONS

Furnish and Install as shown on the drawing—^—air

cooled condensers suitable for tons each of total heat rejection, when condensing refrigerant at , F saturated condensing temperature with air entering at«

F dry-bulb temperature. Units shall be arranged for hori zontal (vertical) air flow.

Units shall consist of: coils, with integral subcooling, 2.

supporting casing with stand, and wind deflector (9AB only). Coil shall be constructed of plate aluminum fins on mechani cally expanded copper tubes, cleaned, dehydrated, sealed, and leak tested at 400 psig (9AB), 410 psig (09DC016), or 420 psig (09DC024 and larger).

Fans shall be direct drive, propeller type, protected by

guards. Motors shall be permanent split-capacitor (9AB, 09DC016) or 3-phase, 60-cycle (09DC016, 024, 028, 034, 044, 054, 064, 084). All motors shall be resiliently mounted and prelubricated, with built-in overload protection. Fan shaft shall be corrosion protected and mounted in prelubri cated bearings. Fan blades shall have an iridite finish. A magnetic contactor shall be field supplied for 9AB, 09DC- 3. 016, and shall be field supplied for 09DC024, 028, 034, 044, 054, 064, 084 if head pressure control is not used.

Casing shall be painted, Galvanneal steel (9AB, 09DC-

016) or heavy-gage, double-weight (2-1/2 oz zinc/sq ft) galvanized steel (09DC024, 028, 034, 044). Access panels shall be provided for electrical connections.

Accessories (To specify from Items 1 thru 4 below, refer to 4.

Head Pressure Control Data table.)

1. Motormaster Electronic Head Pressure Control — Units shall be provided with a completely transistorized vari able speed fan control to modulate unit capacity in re sponse to variations in head pressure. The control en- 5.

Manufacturer reserves the right to change any

closure shall be weathertight and shall have Weather Armor finish. Mounting hardware shall also be provided. Control shall modulate fan motor speed from full to zero rpm to maintain a saturated condensing temperature of approximately 100 F at outdoor temperatures down to —20 F.

Fan Cycling Control — Unit(s) shall be provided with a control to cycle one of two fans (9AB8,12), two of three fans (09DC016,024,028,034,044), or four of six fans (09DC054,064,084), in response to outdoor ambient temp erature. Control package shall include; thermostat and remote bulb (9AB8,12); contactor(s), terminal strip(s), plug, and two-stage thermostat (09DC016,024,028,034,

044); contactors, two-stage thermostat, power control terminal blocks and two quick-connect receptacles, one at end of 10-foot flexible conduit (09DC054,064,084). Controls shall be enclosed in weathertight sheet metal box with cover. Necessary mounting hardware shall be

provided. Head Pressure Control Damper — Unit(s) shall be pro

vided with a control for further reduction in condenser capacity to meet system part load operation or lower outdoor ambient temperatures. This assembly shall in clude: flanged damper frame, movable damper blades, operating linkages, self-contained pressure-operated damper actuator with capillary, and necessary mounting

hardware. Winter Start Control (required when minimum ambient

temperature is below design coil suction temperature) — Unit(s) shall be provided with a Winter Start Control

Package which shall temporarily bypass the system low pressurestat to permit start-up at low temperature.

Floor Mounting Stand (9AB8 and 12).

product specifications without notice.

CARRIER AIR CONDITIONING

Tab 5

Form 9AB,09DC-2P Supersedes 9AB,09DC-1P

COMPANY • SYRACUSE, NEW YORK

Printed in U.S.A.

2-66

Codes C and MC (520902)