York H*DB012-76 Installation Manual download pdf (Page 5)

550.38-N1Y

Unitary Products Group

After holding charge is completely discharged, loosen

and remove the liquid line fitting from the orifice distributor

assembly. Note that the fitting has

right

hand

threads

Remove the orifice from the distributor body using a

small diameter wire or paper clip.

Orifice

not

used

when

the

TXV

assembly

installed.

After orifice is removed, install the thermal expansion

valve to the orifice distributor assembly with supplied fit-

tings. Hand tighten and turn an additional 1/8 turn to

seal.

Do not overtighten fittings

Reinstall the liquid line to the top of the thermal expan-

sion valve. Hand modify the liquid line to align with cas-

ing opening.

Install the TXV equalizer line into the vapor line as follows:

Select a location on the vapor line for insertion of the

equalizer line which will not interfere with TXV bulb

placement.

Use an awl to punch through the suction tube and

insert the awl to a depth to achieve a 1/8 inch diam-

eter hole.

Install TXV equalizer line in 1/8 hole previously made in

vapor line. Equalizer line can be bottomed out in vapor

line as end of equalizer line is cut on 45 degrees angle to

prevent blockage. Braze equalizer line making sure that

tube opening is not brazed closed.

All connections to be brazed are copper-to-copper and

should be brazed with a phosphorous-copper alloy material

such as Silfos-5 or equivalent. DO NOT use soft solder.

Install the TXV bulb to the vapor line near the equalizer line,

using the two bulb clamps furnished with the TXV assembly.

Ensure the bulb is making maximum contact. Refer to TXV

installation instruction for view of bulb location.

Bulb should be installed on a horizontal run of the

vapor line if possible. On lines under 7/8" OD the

bulb may be installed on top of the line. With 7/8"

OD and over, the bulb should be installed at the

position of about 4 or 8 o'clock.

If bulb installation is made on a vertical run, the bulb

should be located at least 16 inches from any bend,

and on the tubing sides opposite the plane of the

bend. On vertical bulb installations, the bulb should

be positioned with the bulb tail at the top, so that the

bulb acts as a reservoir.

Bulb should be insulated using thermal insulation

provided to protect it from the effect of the surround-

ing ambient temperature.

PIPING CONNECTIONS

The outdoor condensing unit may be connected to the indoor

evaporator coil using field supplied refrigerant grade copper

tubing that is internally clean and dry. Units should be

installed only with the tubing sizes for approved system com-

binations as specified in Tabular Data Sheet. The charge

given is applicable for total tubing lengths up to 15 feet. See

Application Data Form 690.01-AD1V for installing tubing of

longer lengths and elevation differences.

NOTE:

Using a larger than specified line size could result in oil

return problems. Using too small a line will result in loss

of capacity and other problems caused by insufficient

refrigerant flow.

Slope horizontal vapor lines at least 1"

every 20 feet toward the outdoor unit to facilitate proper

oil return

PRECAUTIONS DURING LINE INSTALLATION

Install the lines with as few bends as possible. Care must

be taken not to damage the couplings or kink the tubing.

Use clean hard drawn copper tubing where no apprecia-

ble amount of bending around obstruction is necessary.

If soft copper must be used, care must be taken to avoid

sharp bends which may cause a restriction.

The lines should be installed so that they will not obstruct

service access to the coil, air handling system or filter.

Care must also be taken to isolate the refrigerant lines to

minimize noise transmission from the equipment to the

structure.

The evaporator coil is under 30 psig pressure.

Dry nitrogen should always be supplied through the

tubing while it is being brazed, because the tempera-

ture required is high enough to cause oxidation of the

copper unless an inert atmosphere is provided. The

flow of dry nitrogen should continue until the joint has

cooled. Always use a pressure regulator and safety

valve to insure that only low pressure dry nitrogen is

introduced into the tubing. Only a small flow is neces-

sary to displace air and prevent oxidation.

In all cases, mount the TXV bulb after vapor line is

brazed and has had sufficient time to cool.

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York H*DB012-76 Installation Manual Page 5

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