HP N2H3, H2H3 manual Outdoor Unit Higher than Indoor Unit, Liquid Line FILTER-DRIER

INSTALLATION INSTRUCTIONS

C. ROUTING AND SUSPENDING REFRIGERANT LINES

Run refrigerant lines as straight and direct as possible, avoiding unnecessary bends and turns. Always insulate the entire suction line. Both lines should be insulated when routed through an attic or when routed through an underground raceway.

When routing refrigerant lines through a foundation or wall, do not allow refrigerant lines to come in direct contact with the building structure. Make openings large

3-phase R-22 Split System Heat Pump

enough so that lines can be wrapped with extra insulation. Fill all gaps with RTV caulk. This will prevent noise transmission between the tubing and the foundation or wall.

Along floor or ceiling joists, suspend refrigerant lines so that they do not contact the building structure, water pipes, or ductwork. Use insulated or suspension type hangers. Metal straps must be at least 1” wide to avoid cutting into the tube insulation. Keep the liquid and suction lines separate. Refer to Figure 5.

Figure 5

Routing and Suspending Refrigerant Lines

OUTDOOR WALL	INDOOR WALL	HANGER STRAP
CAULK		(AROUND SUCTION
	LIQUID TUBE	TUBE ONLY)

SUCTION TUBE

INSULATION

1” MIN

JOIST

INSULATION SUCTION TUBE

LIQUID TUBE

	THROUGH THE WALL		SUSPENSION
!	CAUTION	Figure 6	Oil Traps for Outdoor Unit Higher
			than Indoor Coil
UNIT OPERATION HAZARD
Failure to follow this caution may result in improp‐			10” Max.
er product operation.
Do not bury more than 36” of line set underground.
Refrigerant may migrate to cooler buried section			3” Min.
during extended periods of unit shut-down, caus‐
ing refrigerant slugging and possible compressor
damage at start-up.
If ANY section of the line set is buried under‐
ground, provide a minimum 6” vertical rise at the			20 ft.
service valve.
D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT			20 ft.
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. Use the “<80 feet” suction line sizes shown
Figure 4.		E. LIQUID LINE FILTER-DRIER
Install oil traps every 20 feet of vertical suction line riser		Outdoor units are shipped with an appropriate filter-drier
(refer to Figure 6).		for installation in the liquid line. Leave the plugs in the tube
NOTE: If there is more than 20 feet vertical separation		ends until the filter-drier is installed. The optimal location
		for the filter-drier is close to the indoor coil. Heat pump
between outdoor and indoor units, refer to the Long Line
		filter-driers are “bi-flow” type. Either end can be pointed
Application Guidline document for additional instructions.
		towards indoor coil. Refer to Figure 7.

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