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Number One
AirCorditbninq
Maker
Division of
Carrier Corporation
Carrier Parkway • Syracus |
N Y 13221 |
Air-Cooled Condensing Units
INDEX |
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Page |
SAFETY CONSIDERATIONS........................... |
1 |
INSTALLATION |
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Step 1 — Check Equipment and Jobsite.... |
2,3 |
•UNPACKAGE UNIT
•INSPECT EQUIPMENT
•COMPLETE OR CONSIDER SYSTEM REQUIREMENTS
Step 2 — Make Tubing Connections ............... |
3-5 |
•REPLACE THE ACCURATER™ REFRIGERANT CONTRQL PISTON IN THE INDOOR COIL
•CONNECT REFRIGERANT LINES
Step 3 — Make Electrical Connections........... |
5,6 |
•INSTALL A BRANCH CIRCUIT DISCONNECT PER N.E.C.
•ROUTE LINE POWER LEADS INTO UNIT
•CONNECT GROUND LEAD AND POWER WIRING
•CONNECT CONTROL POWER WIRING (24 v)
START-UP................................................................ |
6 |
SERVICE.................................................................. |
9-II |
MAINTENANCE.................................................. |
I I - I 2 |
SAFETY CONSIDERATIONS |
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Installation and servicing of air conditioning equipment can be hazardous due to system pres
sure and electrical components. Only |
trained |
and qualified service personnel should |
install, |
repair or service air conditioning equipment. |
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Untrained personnel can perform basic main tenance functions of cleaning coils and cleaning and replacing filters. All other operations should bci performed by trained service personnel. When working on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available for all brazing operations.
WARNING; Before performing service or maioienance oj^erairon^ on system, turn off m^n power switch to iadoor mut and out door UJI&. Tui» off accessory heater power switch if applicable. Eleetrical shock could causepersoii^ injury.
ik -If MTG
SLOTS(USE ANY
2)
C=3 SPACE REQUIRED FOR SERVICE ^ CONDENSER AIRFLOW
CONCRETE MOUNTING PAD^ISQUARE OR CIRCULAR)
^CONCRETE PAD SHOULD WEIGH |-f TO 2 TIMES WEIGHT OF UNIT
Certified dimension drawings available on request
Fig. 1 — Dimensions, Connections and
Mounting Pad
© Carrier Corporation 1980 |
Form 38VH-2SI |
Table 1 — Physical Data
MODEL 38VH |
001 |
0021003 |
004 |
045 |
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005 |
OPER WT (lb) |
165 |
20q 205 |
225 |
240 |
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250 |
DIMEN. (ft-in.) |
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Diameter A |
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2 |
-5-1/4 |
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Unit Height B |
2- 8 |
3-2 3-2 |
3- 8 |
3- 8 |
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3- 8 |
Coil Height C |
1-11 |
2-5 2-5 |
2-11 |
2-11 |
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2-11 |
REFRIG CONN* |
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Suction (in. ODF) |
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5/8 1 3/41 3/41 3/4 I 3/4 | 3/4 |
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Liquid (in. ODF) |
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3/8 |
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*AII models except 38VH001 are supplied with a 3/4-in to 1-1/8 in suction valve connection adapter (field installed) for 1-1/8 in suction line (field supplied)
INSTALLATION
Step 1 — Check Equipment and Jobsite
UNPACKAGE UNIT — Move to final location. Slide from carton taking special care not to damage service valves or grilles.
INSPECT EQUIPMENT — File claim with ship ping company if damaged or incomplete.
COMPLETE OR CONSIDER SYSTEM RE QUIREMENTS before installation:
Consult local building codes and National Electrical Code (NEC) for special installation requirements.
When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping and service. Recommended space minimum requirements are: overhead — 4 ft, perimeter — 3 ft (Fig. 1). Position so water from roof or eaves does not pour directly on unit.
Install on a solid, level mounting pad. Position tie-down bolts in pad. Any 2 holes in unit base may be used to fasten unit to pad.
Carrier Cooling System Capacity Optimization may require field replacement of piston in AccuRater™ (bypass type) refrigerant control supplied on evap orator. See Table 2. Enter table at cooling system Outdoor Air Design Temperature closest to that of locality. Find AccuRater Piston number required for condenser/evaporator system being installed. Piston change is not necessary if table indicates that required piston is factory installed in evaporator coil.
When evaporator is more than one size larger than condensing unit (i.e. 38VH002I28AR036), re move AccuRater and use a bleed-type thermal expansion valve (TXV) for refrigerant control. Size TXV to nominal capacity of condensing unit.
A replacement AccuRater piston is factory sup plied on Models 38VHOO 1,002,003 and 004. This piston is correctly sized for an evaporator of the same capacity as the condensing unit at an outdoor air design temperature of 95 F. Mix-matching and outdoor air design temperatures other than 95 F may require another piston number or thermal ex pansion valve. (Refer to Table 2.)
Replace piston as required before connecting refrigerant lines. Bypass type AccuRater com ponents are shown in Fig. 2. Piston replacement
i Standard factory-installed AccuRater piston
*The 28VH piston designations are applicable to full temperature range
fSize 70 piston factory supplied with 28VH004 . NOTE: Piston numbers effective December 1, 1979
instructions are included in evaporator Installation book. After system installation is complete, use Chargemaster charging device or charging chart to check and/or adjust refrigerant charge.
Condensing Units Connected to Carrier-Approved Evaporators — Condensing units contain correct system refrigerant charge for operation with evap orator of same size when they are connected by 50 ft of field-supplied tubing of recommended size (see Piping Connections) or 50 ft or less of Carrier acces sory tubing. Check refrigerant charge for maximum system efficiency. See Refrigerant Charging for details.
Fig. 2 — AccuRater (Bypass Type)
Components
Condensing Units Connected to Non-Carrier Evap orators — Check refrigerant charge when the con densing unit is added to a system in which other than a Carrier-approved evaporator is to be used or where the evaporator has been previously installed. Check that field-supplied refrigerant piping is in accordance with refrigerant piping data (Table 3).
Step 2 — Make Tubing Connections — Con densing units may be connected to evaporator sec tions using Carrier accessory tubing package or field-supplied tubing of refrigerant grade. See Table 4 for accessory tubing sizes. Table 3 for recom mended field-supplied tubing sizes.
Isolate interconnecting tubing from framing and ductwork or where tubing runs thru stud spaces, enclosed ceilings or pipe chases. Use isolation type hanger (Fig. 3) since rigid fastening transmits pulsa tions to structure creating objectionable sound.
A capacity and efficiency reduction results if undersized Carrier accessory tubing is used in 38VH systems. (Example: When a 25-ft accessory tubing
Fig. 3 — Refrigerant Line Hangers
package is used on a 38VH004 system, the smaller suction line will result in a capacity reduction of 3%.) For maximum capacity and efficiency from this sys tem, use suction line recommended in Table 3.
Length of interconnecting tubing may necessitate refrigerant charge adjustment. Follow special re quirements described in Initial Start-Up, Refrig erant Charging. Do not use less than 10 ft of inter connecting tubing. On Carrier accessory tubing packages, do not cut 5/16-in. or 1 / 4-in. liquid line or 7/8-in. suction line. These tubing packages have swaged ends. If swage at end of tubing is cut off, the tubing will not fit into unit refrigerant line fittings. Bend or coil excess tubing to fit.
Table 3 — Field-Supplied Tubing Data
NOTES
1Maximum allowable vertical separation for evaporator over the condensing unit is 50 feet
2Over 50-ft vertical separation, the condensing unit must be located above evaporator
3The maximum total tubing length between units is 150 feet
4All suction tubing must be insulated with 3/8-in thick, flexible foam tubing (Armaflex 22 or equivalent)
5Piston numbers effective December 1, 1979
Vertical separation from 51 to 100 feet (Condensing unit iabove evaporator)
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REFRIGERANT LINE LENGTH (ft) |
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CONO |
EVAP |
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10 to 50 ft |
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51 to 150 ft |
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UNIT |
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Line Diameter |
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SIZE |
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38VH |
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Suction |
Liquid |
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Indoor |
Suction |
Liquid |
Indoor |
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(in.) |
(in.) |
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Piston* |
(in.) |
(in.) |
Piston* |
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018 |
5/8 |
3/8 |
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52 |
3/4 |
5/16 |
52 ^ |
001 |
024 |
5/8 |
3/8 |
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52 |
3/4 |
5/16 |
52 ■ |
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030 |
5/8 |
3/8 |
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TXV |
3/4 |
5/16 |
TXV ■ |
002 |
024 |
7/8 |
3/8 |
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57 |
7/8 |
5/16 |
57 ■ |
030 |
7/8 |
3/8 |
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59 |
7/8 |
5/16 |
59 ■ |
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036 |
7/8 |
3/8 |
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TXV |
7/8 |
5/16 |
TXV ■ |
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030 |
7/8 |
3/8 |
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63 |
1-1/8 |
5/16 |
63 ■ |
003 |
036 |
7/8 |
3/8 |
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65 |
1-1/8 |
5/16 |
65 ■ |
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042 |
7/8 |
3/8 |
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TXV |
1-1/8 |
5/16 |
TXV ■ |
004 |
036 |
1-1/8 |
3/8 |
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76 |
1-1/8 |
5/16 |
76 U. |
042 |
1-1/8 |
3/8 |
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78 |
1-1/8 |
5/16 |
78 ■ |
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048 |
1-1/8 |
3/8 |
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TXV |
1-1/8 |
5/16 |
TXV ■ |
045 |
042 |
1-1/8 |
3/8 |
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76 |
1-1/8 |
3/8 |
76 ■ |
048 |
1-1/8 |
3/8 |
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78 |
1-1/8 |
3/8 |
78 m. |
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060 |
1-1/8 |
3/8 |
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TXV |
1-1/8 |
3/8 |
TXV » |
nriR |
048 |
1-1/8 |
3/8 |
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82 |
1-1/8 |
3/8 |
82 ■ |
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060 |
1-1/8 |
3/8 |
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84 |
1-1/8 |
3/8 |
84 fm |
002 |
28VH002 |
1-1/8 |
3/8 |
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63 |
1-1/8 |
5/16 |
63 W |
003 |
28VH004 |
1-1/8 |
3/8 |
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70 |
1-1/8 |
5/16 |
70 W |
004 |
28VH004 |
1-1/8 |
3/8 |
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78 |
1-1/8 |
5/16 |
78 B |
*At 95 F outdoor air design temperature At other design temperatures, piston sizes may vary See Table 2
Table 4 — Accessories
PART NO. |
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DESCRIPTION |
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UNIT |
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HH01AD040 |
Low-Voltage Control — Floneywell Deluxe Thermostat |
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HH93AZ040 |
Thermostat Subbase |
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C |
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HH51AR001 |
Comfort Control Center (Use with FIFI01AD040) |
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HH07AT070 |
Low-Voltage Control — Honeywell Thermostat |
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HH07AT074 |
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HH93AZ076 |
Thermostat Subbase (with Automatic Changeover) |
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All |
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HH01AD042 |
Low-Voltage Control — Honeywell Thermostat |
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HH93AZ042 |
Thermostat Subbase |
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HH01YA092 |
Low-Voltage Control — Grayson Thermostat |
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HH93YZ094 |
Thermostat Subbase |
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38GS900102 |
Indoor Fan Relay (Six HN61KJ210) |
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38GS900212 |
Low-Voltage Transformer (Six 38GS900091) |
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38HQ900011 |
Hot Shot — domestic water pre-heater |
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38UE900001 |
Chillermate refrigerant-to-water heat exchanger |
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38VH003,004, |
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045,005 |
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32LT900301 |
Motormaster® Head Pressure Control Special field-installed fan motor HC42VE233 required |
38VH002,003,004, |
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045,005 |
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38GS900321 |
Liquid Line Filter-Drier (Six 38GS900332) |
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All |
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TUBING* |
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TUBING |
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Liquid |
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Suctionf |
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UNIT |
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Length |
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Tube End, |
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PACKAGES |
OD |
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Tube End |
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OD |
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(ft) |
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OD (in.) |
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(in ) |
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OD (in.) |
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(in.) |
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Evap |
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Cond |
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38LS958151 |
15 |
3/8 |
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3/8 |
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5/8 |
3/4t |
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5/8 |
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38VH001 |
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38LS958201 |
20 |
3/8 |
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3/8 |
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5/8 |
3/4t |
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5/8 |
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38VH002 |
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38LS958251 |
25 |
3/8 |
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3/8 |
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5/8 |
3/4t |
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5/8 |
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38LS958301 |
30 |
5/16 |
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3/8 |
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5/8 |
3/4J |
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5/8 |
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38LS958351 |
35 |
5/16 |
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3/8 |
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5/8 |
3/4i |
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5/8 |
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38VH001 |
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38LS958401 |
40 |
5/16 |
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3/8 |
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5/8 |
3/4i |
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5/8 |
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38LS958501 |
50 |
1/4 |
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3/8 |
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5/8 |
3/4i |
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5/8 |
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38LS934251 |
25 |
3/8 |
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3/8 |
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3/4 |
3/4 |
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3/4 |
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38LS934301 |
30 |
3/8 |
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3/8 |
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3/4 |
3/4 |
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3/4 |
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38VH002 |
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38LS934351 |
35 |
3/8 |
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3/8 |
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3/4 |
3/4 |
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3/4 |
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38LS934401 |
40 |
3/8 |
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3/8 |
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3/4 |
3/4 |
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3/4 |
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38LS934501 |
50 |
3/8 |
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3/8 |
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3/4 |
3/4 |
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3/4 |
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38LS978151 |
15 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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38VH003 |
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38LS978201 |
20 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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38VH004 |
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38LS978251 |
25 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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38VH045 |
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38LS978301 |
30 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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38VH005 |
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38LS978351 |
35 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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(See Note 2) |
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38LS978401 |
40 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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38LS978501 |
50 |
3/8 |
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3/8 |
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7/8 |
3/4 |
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3/4 |
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*For maximum capacities, use suction line sizes recommended in Table 3 If accessory tubing package is used on 38VH004,045, 005 units, a reduction in capacity can result Field-supplied 1-1/8 in suction line is recommended with all 28VFI coil installations
fSuction line is insulated and has a 90 degree bend at one end JFor 5/8-in evaporator connection, cut off 3/4-in end
NOTE Do not cut 3/8-in OD liquid lines to a length shorter than 10 feet Do not cut 5/16-or 1/4-in liquid line Do not cut 7/8-in OD suction lines
Do not use damaged or contaminated tubing. Always evacuate or purge evaporator coil and tubing system. When purging, use field-supplied refrigerant, not unit holding charge refrigerant.
When making tubing connections, be sure to pro vide clearance at unit for electrical connections.
REPLACE THE ACCURATER™ REFRIGER ANT CONTROL PISTON IN THE INDOOR COIL, if required, before connecting refrigerant lines. See Carrier Cooling System Optimization, page 2.
CONNECT REFRIGERANT LINES to fittings on condensing unit suction and liquid service valves
(Fig. 1). Unit Compatible Fittings permit mechani cal (quick connect) or sweat connections.
Models 38VH002,003,004,045,005 — When using 1-1/8 in. field-supplied suction line, remove suction line adapter taped to compressor suction line. Sweat connect refrigerant suction line to 1-1/8 in. end of adapter. Be sure to provide a heat sink at the service valve to prevent damage during sweating operation. Connect 3/4-in. end of adapter to unit suction line Compatible Fitting. Connect liquid refrigerant line to unit. When a 7/8-in. field-supplied suction line is used, provide a field-supplied 3/4-in. to 7/8-in. suction line adapter. (Not necessary if 38LS acces sory tubing is used.)
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