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8

Multi-zone Heat Pump Condensing Units

The system will support refrigerant runs

to the inside unit of up to 100' equivalent

feet with a 35' rise included. The units

are furnished with sweat connections and

are equipped with refrigerant valves and

Schrader ﬁttings for charging and taking

pressure readings. The following precau-

tions should be made:

INTERCONNECTING TUBING

SPECIFICATIONS

Model

MAX.

Length

Max.

Lift

Liquid

Line O.D.

Suction

Line O.D.

9900 100’ 35’ 1/4" 1/2"

2200 100’ 35’ 1/4" 1/2"

9200 100’ 35’ 1/4" 1/2"

REFRIGERANT PIPING INSTALLATION SECTION

• A P-trap is recommended when the suc-

tion riser is equal to or greater than 20

feet in height.

• When the condenser is installed above

the evaporator, the P-trap will help the

return of oil back to the compressor.

• The placement of the P-trap should be at

the halfway mark of the suction riser. For

example if the suc

-

tion riser is 30 feet tall

then a P-trap is recom

-

mended at the 15 foot

mark of the suction

riser

(see Figure #1).

• A P-trap may be fabri

-

cated using;

(2) street elbows and

(2) regular elbows. A

prefabricated trap

may be purchased

from a Wholesaler

or Distributor however the trap should

be shallow as the:

(4) elbow conﬁguration. Each elbow is

approximately 2 equivalent feet. One

P-trap is equal to approximately 8

equivalent feet.

P-TRAP INSTALLATION

30’

15’

Evaporator

or

Condenser

Evaporator

or

Condenser

Figure #1

• Be certain no burrs remain on the

ﬁttings.

• Use only clean refrigeration tubing.

• Use tube benders to guard against

kinking.

• Avoid piping on wet and rainy days

and insulate suction line. Be certain

that plastic end caps remain in place

when inserting through wall openings.

Isolate tubing from transmitting vibra

-

tion to the building or unit and avoid

contact with sharp edges. Refrigera

-

tion valves should be wrapped with

a wet rag "heat sink" to protect

valves while brazing.

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