Ducane (HVAC) 2HP13/14 Manual Do Utilizador

506162-02

Issue  0847

      Page  4  of   14

It is im portant that no tubing be cut or seals broken

until you are ready to actually m ake connections to the
evaporator and to the condenser section.  DO NOT rem ove
rubber plugs or copper caps from  the tube ends until ready
to m ake connections at evaporator and condenser.  Under
no circum stances leave the lines open to the atm osphere
for any period of tim e, if so unit requires additional
evacuation to rem ove m oisture.

Be  extra careful with sharp bends.  Tubing can "kink"

very easily, and if this occurs, the entire tube length will
have to be replaced.  Extra care at this tim e will elim inate
future service problem s.

It is recom m ended that vertical suction risers not be

up-sized.  Proper oil return to the com pressor should be
m aintained with suction gas velocity.

DO NOT fasten liquid or suction lines in direct contact

with the floor or ceiling joist.  Use an insulated or
suspension type of hanger.  Keep both lines separate, and
always insulate the suction line.  Long liquid line runs (30
feet or m ore) in an attic will require insulation.  Route
refrigeration line sets to m inim ize length.

DO NOT let refrigerant lines com e in direct contact with

foundation.  W hen running refrigerant lines through the
foundation or wall, openings should allow for a sound and
vibration absorbing m aterial to be placed or installed
between tubing and foundation.  Any gap between
foundation or wall and refrigerant lines should be filled with
a vibration dam ping m aterial.

Before m aking braze connections, be sure all joints are

clean.  Before heat is applied for brazing, dry nitrogen
should be flowing through the tubing to prevent oxidation
and scale form ation on the inside of the tubing.

The following is the recom m ended m ethod for m aking

braze connections at the refrigerant line connections:

1.

Debur and clean refrigerant tube end with em ery
cloth or steel brush.

2.

Insert tubing into swage fitting connection.

3.

W rap wet rags over valves to protect from  heat.

4.

Allow dry nitrogen to flow through refrigerant lines.

5.

Braze joint, using a suitable brazing alloy for copper
to copper joints.

6.

Quench the joint and tubing with water using a wet
rag.  Leave rag on fitting body and re-wet with water
to help cool area.

Refrigeration lines and indoor coil m ust be checked for

leaks after brazing and before evacuation.  The
recom m ended procedure is to apply a trace am ount of
vapor refrigerant (approxim ately two ounces or 3 psig) into
the line set and indoor coil, then pressurize with 150 psig
of dry nitrogen.  Use a refrigerant leak detector to check all
joints.  The system  m ay also be checked for leaks using a
halide torch or pressure and soapy solution.  After
com pletion of leak check, relieve all pressure from  system
before evacuation.

These outdoor units are pre-charged at the factory with

adequate refrigerant to handle 15 feet of refrigerant tubing.

NOTE: DO NOT use any portion of the charge for purging

or leak testing.  It is m andatory that a thorough
evacuation of the refrigeration lines and indoor coil
be perform ed.

The liquid line and suction line service valves have been

closed after final testing at the factory.  DO NOT disturb
these valves until the lines have been leak checked and
evacuated or the charge in the unit may be lost.

1.

Connect the vacuum  pum p to the center hose of the
m anifold gauge set, the low-pressure m anifold
gauge to the vapor service valve and the high
pressure m anifold gauge to the liquid service valve.

NOTE: Unnecessary  switching of hoses can be avoided

and com plete evacuation of all lines can be
achieved by also connecting a branch hose from
the m anifold gauge center port to a cylinder of the
proper refrigerant.  Provide a separate shut-off
valve to vacuum  pum p to avoid contam inating
vacuum  pum p oil with refrigerant.

C onnection D ia. T ube D ia. C onnection D ia.

T ube D ia.

018

3/8"

3/8"

3/4

3/4

024

3/8"

3/8"

3/4

3/4

030

3/8"

3/8"

3/4

3/4

036

3/8"

3/8"

3/4

3/4

042

3/8"

3/8"

7/8

7/8

048

3/8"

3/8"

7/8

7/8

060

3/8"

3/8"

7/8

*1-1/8

*FIE LD   S U P P LIE D   7/8  X  1 -1 /8  C O N N E C T O R   R E Q U IR E D   O N   B O T H
E N D S   O F  V A P O R   T U B IN G .

If ANY refrigerant tubing is buried, provide a 6 inch
vertical rise at service valve.  Refrigerant tubing
lengths up to 36 inches m ay be buried without further
special consideration.  For lengths above 36 inches,
consult your local distributor.