Terra Indoor Unit Installation - Gree MULTI18HP230V1CO Installation Manual

Multi21 plus ductless inverter heat pump

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Service manual (62 pages)

Table Of Contents

Table of Contents

Enlarged version

TWD-1518 multi21+ install_printer.qxp_Layout 1 3/22/17 9:41 AM Page 21

TESTING AND INSPECTION

Leaking Test

Leak test each indoor unit, one unit at a time. Repeat the leak test sequence for each indoor unit.

1. Connect the charging hose of the manifold valve to charge the end of the low-pressure valve.

2. Add dry nitrogen to a pressure of 200 lbs. Tightly close both high- and low-pressure valves.

3. Leak-test flare fittings with soap bubbles. If no leak is detected, release nitrogen.

System Vacuum and Charge

Evacuate each indoor unit, one unit at a time. Repeat the evacuation sequence for each indoor unit.

UNIT DAMAGE HAZARD – Never use the system compressor as a vacuum pump.

It may result in equipment damage or improper system operation.

Refrigerant pipes and indoor coil should be evacuated using the recommended deep vacuum

method of 500 microns. The alternate triple evacuation method may be used if the procedure

outlined below is followed.

NOTE: Always break a vacuum with dry nitrogen.

Using Vacuum Pump

1. Completely tighten flare nuts A, B, C, D,

connect manifold gauge charge hose to a

charge port of the low side service valve.

2. Connect charge hose to vacuum pump.

3. Fully open the low side of manifold gauge.

See figure at right.

4. Start vacuum pump.

C UTION

Refrigerant

Outdoor Unit

Low Side

High Side

Service Valve

Manifold Gauge

500 microns

Low Side Valve

High Side Valve

Charge Hose

Low Side Valve