Day and Night WCH**4 Manuale di istruzioni per l'installazione - Pagina 6

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INSTALLATION INSTRUCTIONS

Figure 4

OUTDOOR WALL

CAULK

INSULATION

THROUGH THE WALL

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in improp-

er product operation.

Do not bury more than 36" (1m) of line set under-

ground. Refrigerant may migrate to cooler buried

section during extended periods of unit shut−

down, causing refrigerant slugging and possible

compressor damage at start−up.

If ANY section of the line set is buried under-

ground, provide a minimum 6" (152mm) vertical

rise at the service valve.

D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT

Proper oil return to the compressor should be maintained

with suction gas velocity. If velocities drop below 1500

fpm (feet per minute), oil return will be decreased. To

maintain suction gas velocity, do not upsize vertical

suction risers.

E. LIQUID LINE FILTER−DRIER

NOTE: It is recommended that an appropriate filter−drier

be installed in the liquid line.

Leave the plugs in the tube ends until the filter−drier is

installed. The optimal location for the filter−drier is close

to the indoor coil. Heat pump filter−driers are "bi−flow"

type. Either end can be pointed towards indoor coil. Refer

to Figure 5.

Routing and Suspending Refrigerant Lines

INDOOR WALL

LIQUID TUBE

SUCTION TUBE

R−410A Split System Heat Pump

HANGER STRAP

(AROUND SUCTION

TUBE ONLY)

1" (25mm) MIN

SUSPENSION

Liquid Line Filter−Drier

Figure 5

Installed at Indoor Coil

Filter−Drier

F. SERVICE VALVES

Service valves are closed and plugged from the factory.

Outdoor units are shipped with a refrigerant charge

sealed in the unit. Leave the service valves closed until all

other refrigerant system work is complete or the charge

will be lost. Leave the plugs in place until line set tubing is

ready to be inserted.

Heat pumps require a piston metering device in the liquid

service valve for proper heating operation. Piston is

shipped in the piston body of the liquid service valve,

temporarily held in place with a plastic cap. Do not remove

the plastic cap until line set tubing is ready to be installed.

Refer to Figure 6 and follow these steps for piston

installation:

JOIST

INSULATION

SUCTION TUBE

LIQUID TUBE

38−11−84

428 01 5302 00