CeilAir DX Series Návod k obsluze stáhnout pdf (Strana 18)

(Mar, 2012)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

2-7

Wrap wet rags around the pipes between the areas

to be soldered and any nearby refrigeration compo-

nents to keep excessive heat from traveling through

the pipe and causing damage.

Clear all pipe connections of debris and prep connec-

tions for soldering. Use only “L” or “K” grade refriger-

ant copper piping. Be careful not to allow solder/pip-

ing debris to get inside refrigerant lines. Silver solder

containing a minimum of 15% silver is recommended.

Dry nitrogen should be ﬂ owing through the tubing

while soldering at a rate of not less than 1-2 CFM

(0.028-0.57 M

/minute).

Refrigerant lines for split systems must be sized

according to the piping distance between the evapo-

rator and the condenser/condensing unit. Each

valve, ﬁ tting and bend in the refrigerant line must be

considered in this calculation. Pipe sizes are given

for “equivalent feet”, not linear feet. Do not confuse

the terminologies. For example, a 7/8” standard 90°

elbow has an equivalent length of 1.5 feet; a 7/8”

branch Tee has an equivalent length of 3.5 feet.

These corrections must be accounted for when sizing

your piping. Refer to the following table for standard

equivalent lengths, in feet, of straight pipe.

Oil traps must be included every 20 feet in the verti-

cal risers and the refrigerant lines must be sloped ¼

inch for every 10 feet in the horizontal lines to ensure

proper oil return to the compressor. An inverted

trap is required on the discharge line of the remote

condenser to help prevent oil and liquid from ﬂ ooding

back to the compressor.

NOTE

In the following 3 tables, the line sizes represent

the correct size for individual refrigeration cir-

cuits. Dual circuit units, (Models 048D to 120D),

have two separate pairs of refrigeration lines.

One per compressor.

EQUIVALENT LENGTH (FT.) OF STRAIGHT PIPE

OD (In.) Globe Angle 90° 45° Tee Tee

Line Size Valve Valve Elbow Elbow Line Branch

1/2 9.0 5.0 0.9 0.4 0.6 2.0

5/8 12 6.0 1.0 0.5 0.8 2.5

7/8 15 8.0 1.5 0.7 1.0 3.5

1 1/8 22 12 1.8 0.9 1.5 4.5

1 3/8 28 15 2.4 1.2 1.8 6.0

RECOMMENDED DISCHARGE LINE SIZES

Equivalent Length Ft.

50’or less 100’or less 150’or less

012 / 12,000 1/2 1/2 5/8

018 / 18,000 5/8 5/8 5/8

024 / 24,000 5/8 7/8 7/8

032 / 32,000 5/8 7/8 7/8

040 / 40,000 7/8 7/8 7/8

048 / 48,000 7/8 7/8 7/8

048D / 48,000 5/8 7/8 7/8

060 / 60,000 7/8 1-1/8 1-1/8

072D / 72,000 7/8 7/8 7/8

084D / 84,000 7/8 7/8 7/8

120D / 120,000 7/8 1-1/8 1-1/8

*Equivalent Ft. accounts for the linear pipe length as well as equiva-

lent length of Valves, Elbows & Tee’s as shown in the previous table.

Model No. /

Total Unit Capacity

Model No. /

Total Unit Capacity

RECOMMENDED LIQUID LINE SIZES

Condenser to A/C Unit /

Receiver to Evap. (*Equivalent Ft.)

50’or less 100’or less 150’or less

012 / 12,000 3/8 3/8 3/8

018 / 18,000 3/8 3/8 1/2

024 / 24,000 3/8 1/2 1/2

032 / 32,000 1/2 1/2 1/2

040 / 40,000 1/2 5/8 5/8

048 / 48,000 1/2 5/8 5/8

048D / 48,000 3/8 1/2 1/2

060 / 60,000 1/2 5/8 5/8

072D / 72,000 1/2 1/2 1/2

084D / 84,000 1/2 5/8 5/8

120D / 120,000 1/2 5/8 5/8

CAUTION

Do not exceed the maximum Liquid Line lengths

for the system conﬁ gurations listed below:

RCU with Hot Gas Bypass .......50 Ft

Remote Condensing Unit ........100 Ft

Remote Air Cooled Condenser 150 Ft

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 59 60

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