Evacuation Of The System; Leak Testing; Vacuum Purge - Sea Breeze SMZ42H46ZOGX Installation Manual

EVACUATION OF THE REFRIGERATION TUBES AND INDOOR UNIT
After connecting the indoor and outdoor units, evacuate the air from the line set and the indoor unit as follows:
Leak Testing - Indoor units are nitrogen pre-charged, however they should be pressure tested before
installation.
1. Connect the charging hoses to the low side of the manifold and the service port of the Gas valve (See figure
20).
2. Connect the center hose of the manifold valve to a
nitrogen source.
NOTE: The nitrogen gas cylinder is used in a vertical standing position.
3. Charge system with nitrogen to 150 PSI and check for leaks, using standard industry leak detection methods.
4. Pay attention to possible evaporator leaks that may have occurred during shipping or installation.
5. Remove the nitrogen by opening the manifold valves.

Vacuum Purge

1. Connect the center hose of the manifold valves to a vacuum pump, and open fully the low and high pressure
sides of the manifold valves.
DO NOT OPEN SERVICE PORT VALVES
2. Turn on the vacuum pump. Evacuate system for about 30 minutes and confirm that the vacuum reading is
500 microns.
3. Close all manifold valves and turn off the vacuum pump. After waiting for several minutes, confirm that the
vacuum reading of the manifold has not changed. If the vacuum reading has changed, there is a leak that must
be found and repaired before continuing.
4. Remove the valve caps from the two valves. Slowly open liquid valve fully using a hexagonal Allen wrench.
Use the same procedure on the suction valve. Open both valves to the full back seat position.
5. Securely tighten the caps back onto liquid and suction the valves.
6. Check for gas leaks from all connections. Test with an electronic leak detector, or with soapy water and
check for bubbles. Be sure to wipe off the soap with a clean cloth after leakage test.
950-0203-revK
Manometer
" "
LO knob
Liquid Valve
Figure 20
Gas Valve
- 18 -
Manometer
" "
HI knob
Vacuum pump
Hose
March 1, 2016