Carrier 38YCW ConnectingTubing Installation, Dimensions In, MountingUnit to Pad, ElevateUnit

NOTE: Avoid contact between tubing and structure

OUTDOOR WALL INDOOR WALL

CAULK

LIQUID TUBE

VAPOR TUBE

INSULATION

THROUGH THE WALL

JOIST

HANGER STRAP

(AROUND VAPOR

TUBE ONLY)INSULATION VAPOR TUBE

1″ MIN.

LIQUID TUBE

SUSPENSION

A94028

Fig. 2—Connecting Tubing Installation

INSTALLATION

Step 1—Check Equipment and Job Site

UNPACK UNIT

Move to final location. Remove carton, taking care not to damage unit.

INSPECT EQUIPMENT

File claim with shipping company prior to installation if shipment is damaged or incomplete. Locate unit-rating plate on unit-service panel. It contains information needed to properly install unit. Check rating plate to be sure unit matches job specifications.

Step 2—Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad, tie-down bolts should be used and fastened through knockouts provided in unit base pan. Refer to unit-mounting pattern in Fig. 3 to determine base-pan size and knockout-hole location.

On rooftop applications, mount on level platform or frame 6 in. above roof surface. Place unit above a load-bearing wall and isolate unit and tubing set from structure. Arrange supporting members to adequately support unit and minimize transmission of vibration to building. Consult local codes governing rooftop applications.

Roof-mounted units exposed to winds above 5 mph may require wind baffles to achieve adequate defrost. Consult Low-Ambient Guideline for wind-baffle construction.

NOTE: Unit must be level to within ±2° (±3/8 in./ft) per compressor manufacturer specifications.

Step 3—Clearance Requirements

When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping, and service. Allow 30-in. clearance to service end of unit and 48 in. above unit. For proper airflow, a 6-in. clearance on 1 side of unit and 12 in. on all remaining sides must be maintained. Maintain a distance of 24 in. between units. Position so water, snow, or ice from roof or eaves cannot fall directly on unit.

On rooftop applications, locate unit at least 6 in. above roof surface.

C

						3⁄8″ D. (9.53) TIEDOWN
		A				KNOCKOUTS (2) PLACES
				B				A94199
			Dimensions (In.)
UNIT		MINIMUM			TIEDOWN KNOCKOUT LOCATIONS
	MOUNTING-PAD
SIZE					A		B	C
		DIMENSIONS
018–030		22-1/2 x 22-1/2			3-11/16		18-1/8	14-3/8
036–060		30 x 30			6-1/2		23-1/2	20

Fig. 3—Mounting Unit to Pad

Step 4—Operating Ambients

The minimum outdoor-operating ambient in cooling mode is 55°F, and the maximum outdoor-operating ambient in cooling mode is 125°F. The maximum outdoor-operating ambient in heating mode is 66°F.

Step 5—Elevate Unit

Accumulation of water and ice in base pan may cause equipment damage.

In areas where prolonged freezing temperatures are encountered, elevate unit per local climate and code requirements to provide clearance above estimated snowfall level and ensure adequate drainage of unit.

Step 6—Check Indoor And Outdoor AccuRater® Piston

Check indoor-coil piston to see if it matches the required piston shown on outdoor unit-rating plate. If it does not match, replace indoor-coil piston with piston shipped with outdoor unit. The piston shipped with outdoor unit is correct for any approved indoor-coil combination.

Remove indoor-coil piston if unit is to be installed on system with a TXV-metering device.

Step 7—Check Defrost Thermostat

Check defrost thermostat to ensure it is properly located and securely attached. There is a liquid header with a brass distributor and feeder tube going into outdoor coil. At the end of 1 of the feeder tubes, there is a 3/8-in. O.D. stub tube approximately 3 in. long. The defrost thermostat should be located on stub tube. Note that there is only 1 stub tube used with liquid header, and on most units it is the bottom circuit.

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