LSN090HFV3 User Manual

Loading ...

Insulation

Due to our policy of continuous product innovation, some specifications may change without notification.

INSULATION

Figure 67: Typical Insulation Butt-

Joint at Indoor Unit Casing.

Figure 68: Typical Refrigerant

Flare Fitting Insulation Detail.

Refrigerant Piping System Insulation

For information regarding insulation for underground or penetration situations, see the “General Refrigerant Piping System Information” section.

All refrigerant piping from the outdoor unit to the indoor units must be insulated correctly for safety and usage. Refrigerant piping, field-pro-

vided isolation ball valves (if present), service valves, and elbows must be properly and completely insulated using closed cell pipe insulation

(up to the indoor unit piping connections). To prevent heat loss / heat gain through the refrigerant piping, all refrigerant piping including liquid

lines and vapor lines must be insulated separately. Insulation must be a minimum 1/2 inches thick, and thickness will need to be increased

based on ambient conditions and local codes. Table on next page lists minimum wall thickness requirements for Ethylene Propylene Diene

Methylene (EPDM) insulation.

Inside the outdoor unit, maximum pipe temperature is 248°F and minimum pipe temperature is -40°F. For field insulation of refrigerant piping

between outdoor units and indoor units, consider the following pipe temperature ranges for an operating heat pump system:

• Heating mode refrigerant temperature ranges: Liquid = 75-118°F; High Pressure Vapor = 95-220°F

• Cooling mode refrigerant temperature ranges: Liquid = 75-118°F; Low Pressure Vapor = 40-90°F

All insulation joints must be glued with no air gaps. Insulation material must fit snugly against the refrigeration pipe with no air space between

it and the pipe. Do not allow insulation passing through pipe hangers, inside conduit, and/or sleeves to be compressed. Protect insulation

inside hangers and supports with a second layer. All pipe insulation exposed to the sun and outdoor elements must be properly protected

with PVC, aluminum vapor barrier, or alternatively placed in a weather-resistant enclosure such as a pipe rack with a top cover; and meet

local codes.

Surface of

Indoor Unit Casing

Field-Provided

Pipe Insulation

Figure 69: Insulating the Shut Off / Insulation Ball Valve (If Present).

Indoor Unit

Insulation (Field Supplied)

Cable Tie, etc.

(Field Supplied)

Refrigerant Piping

Always include plenty of insulation on all refrigerant and drain piping to ensure condensate does not form and cause damage to walls, oors, etc.

Loading ...

User Manual - Page 45