Carrier 38GS - Manual (Page 3)

Table 3 — Field-Supplied Piping Data
MAX COND REFRIGERANT LINE LENGTH (ft)
COND REFRIG UNIT HT (ft) 25- 50 51» 7S 7&~ 1 m
f 3 UNIT CONTROL Above Be low Line Diameter (in* OD)
X-
Evap Evap Suet Liq
iÄiii
Litj 1 LE íj
TXV 90 90 '
38GS014,
38GS018 Cap. Tube
or
AccuRater'*'^
150 50
V
'8 V» 'x iiiiii lili
IH
iiiiii ¡Mil
38GS024
TXV
Cap. Tube
yo
150
90
50 % %
IIBI
■
AccuRater
38GS030,
38CC030,
38CE002
Cap. Tube
or
AccuRater
150
__
50
% Vs
iiiiiiiiiii
wmmmmmmm
ilM MB ilBi %
38GS036,
38CC036,
38CE003
TXV 90 90
Cap. Tube
or
AccuRater
150 50
% V» T ISl
38GS042,
38CC042,
38CE004
TXV 90 90
Cap Tube
or
AccuRater
150 50 /4
V» N s
TXV 90 ■ 90
38GS048,
38CC048 Cap Tube
or
AccuRater
150 50
% % liM T %
■
TXV 90 90
38CE045
Cap. Tube
or 150 50
1% % Iliiii k V
11 »
AccuRater Äiii
38GS06 0,
38CC060,
38CE005
L^y
Cap. Tube
or
AccuRater
90
150
90
50
IV» V» *
Í...............
Cap. Tube
TXV
Crankcase heater and liquid line filter-drier required
on 38GS and 38CE units Accessory start capacitor
with relay also required on 38GS unit, but not
normally required on 38CE units See Compressor
Service Reduce liquid line diameter by 1/8-in OD
(min 1/4-in OD) when evaporator is 20 ft or more
below condensing unit
■ Capillary Tube
- Thermal Expansion Valve
NOTES
1 The following system modifications are required adjust
refrigerant charge on systems with over 25 ft separation
between condensing unit and evaporator (See Refrigerant
Charging ) Adjust system oil charge as described in Note 2
Oil charge adjustment add 1% of nominal oil charge in
system (Table 7) for each 10 ft of refrigerant line length
above 50 feet Eor example, a system that has a 50-oz oil
charge with 1 50 ft of interconnecting piping requires 5 oz of
additional oil as shown below:
150 ft - 50 ft = 100 ft
100 ft -E 10 ft = 10 ft
1 0 x 1 % = 1 0 % ( 1 0 )
10 X 50 oz = 5 oz
Do not permit condensing unit to short cycle, particularly on
applications with long vertical line lengths Correct short
cycling condition immediately
Connection Procedure — When making tubing
connections, be sure to provide clearance at unit
for electrical connections.
Connect refrigerant liquid and suction lines to
condensing unit, Fig. 1. Unit Compatible Fittings
permit 2 methods of refrigerant line connection;
mechanical (quick connect) or sweat connection.
Make suction line connection first.
38CE045,005, 38GS060 AND 38CC060 UNITS -
Remove suction line adapter taped to compressor
suction line. Connect 3/4-in. end of adapter to unit
suction line Compatible Fitting. Sweat connect
refrigerant suction line to 1 1/8-in. end of adapter.
Connect liquid refrigerant line to unit.
MECHANICAL CONNECTION (Mate one set of
connections at a time.)
1. Loosen nut on Compatible Fitting one turn. Do
not remove.
Remove plug and be sure 0-ring is in the groove
inside the Compatible Fitting.
Cut tubing to correct length.
Use gage on tag attached to service valve to
mark tube end for correct insertion depth.
Insert tube into Compatible Fitting until it
bottoms. (Tube should be inserted at least as
far as mark on tubing.)
Tighten nut until it bottoms on back coupling
flange.
2
.
3.
4.
5.