General installation information – Envision Peripherals IM1603 User Manual

Page 9

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8

ENVISION SERIES AIR HANDLER INSTALLATION MANUAL

General Installation Information

Refrigeration

The Envision NAH series air handlers are supplied with an

expansion device. Once the line set has been brazed into

the air handler the txv bulb must be attached to the suc-

tion line outside of the cabinet and insulated with foam

tape. Be careful not to crush the txv bulb by over-tighten-

ing the clamp. The txv supplied has an internal check valve

so no external check valve is necessary. The air handler txv

should be adjusted initially per TXV Superheat Adjustments

table. Check sub-cooling and superheat, refrigerant charge

and txv may require further adjustment.

TXV Superheat Adjustment Procedure (see figure 4)

Txv’s may require adjustment for a specific application.

Remove the seal cap from the bottom of the valve.

Turn the adjustment screw counterclockwise to increase

superheat and clockwise to decrease superheat.

One complete 360° turn changes the superheat

approximately 3-4°F. You may need to allow as much as

1.

2.

30 minutes after the adjustment is made for the system

to

stabilize.

Once the proper superheat setting has been achieved

replace and tighten the seal cap.

Warning – There are 8 total (360°) turns on the superheat

adjustment stem from wide open to fully closed. When

adjusting the superheat stem counterclockwise (superheat

increase) and the stop is reached, any further counterclock-

wise turning adjustment will damage the valve.

NOTE: The air handler is factory supplied with a holding

charge of dry nitrogen.

Charging the System

Refer to IM1592 for charging the system, checking sub-cool-

ing/superheat and unit operating parameters. Refer to the

Refrigerant Line Sizing table for initial refrigerant charge

amounts used with the Envision Split.

3.

Refrigerant Line Sizing

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