York H*DB012-76 Installation Manual download pdf (Page 7)

550.38-N1Y

Unitary Products Group

Carefully remove the brazed plugs from the evaporator

liquid and vapor connections after relieving the pressure

in the evaporator.

Braze the liquid line to the evaporator liquid connection.

The nitrogen should now be flowing through the evaporator

coil.

Slide the grommet away from the vapor connection at

the coil. Braze the vapor line to the evaporator vapor

connection. After the connection has cooled, slide the

grommet back into original position.

Protect the vapor valve of the outdoor unit with a wet rag

and braze the vapor line connection. The nitrogen flow

should be exiting the system from the vapor service port

connection. After this connection has cooled, remove the

nitrogen source from the liquid fitting service port.

Replace the schrader cores in the liquid and vapor

valves.

Evacuate the vapor line, evaporator and the liquid line, to

500 microns or less.

Leak test all refrigerant piping connections including the

service port flare caps to be sure they are leak tight. DO

NOT OVERTIGHTEN (between 40 and 60 inch - lbs.

maximum).

NOTE:

Do not use the system refrigerant in the outdoor unit to

purge or leak test.

10.

Replace caps on service ports. Do not remove the flare

caps from the service ports except when necessary for

servicing the system.

11.

Release the refrigerant charge into the system. Open

both the liquid and vapor valves by removing the plunger

cap and with an allen wrench back out counter-clockwise

until valve stem just touches retaining ring. Release the

refrigerant charge into the system. See “

PRECAUTIONS

DURING BRAZING ANGLE VALVE

” on page 6.

Replace plunger cap finger tight, then tighten an additional

1/12 turn (1/2 hex flat). Cap must be replaced to prevent

leaks.

If a leak is suspected, leak test to locate the leak. To verify

the leak, close the valve to the vacuum pump suction to iso-

late the pump and hold the system under vacuum. If the

micron gauge indicates a steady and continuous rise after a

few minutes, it's an indication of a leak. If the gauge shows a

rise, then levels off after a few minutes and remains fairly

constant, its an indication that the system is leak free, but still

contains moisture and may require further evacuation if the

reading is above 1000 microns.

12.

If the refrigerant tubing, indoor evaporator coil or outdoor

condensing unit has developed a leak during shipment,

or was, for any other reason, opened to the atmosphere

for more than four (4) minutes, it is necessary to evacu-

FIGURE 6 :

HEAT PROTECTION

If visual verification of the valve stem reaching the

retaining ring is impossible, stop backing out the.valve

stem when the slightest increase in resistance is felt.

Because of the small size and therefore the reduced

resistance, back out the liquid valve

5 turns maximum

to prevent going past the retaining ring.

The evaporator is pressurized.

Do not connect manifold gauges unless trouble is

suspected. Approximately 3/4 ounce of refrigerant

will be lost each time a standard manifold gauge

is connected.

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York H*DB012-76 Installation Manual Page 7

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