Magic Aire DV SERIES, Installation, Operation And Maintenance Manual

Page: 7 / 16

035-000040-001 Page 7 of 16 DVB IOM 1.4 08-23-2016
INSTALLATION OF REFRIGERANT LINES
Size and install refrigerant lines in accordance
with the condensing unit manufacturer’s instruc-
tions.
REFRIGERANT PIPING AT THE UNIT: Install
TXV sensing bulb 7 diameters downstream from
the manifold on a horizontal section of the suction
line in the 3-o'clock or 9-clock position. Insulate
the sensing bulb thoroughly so that it receives a
good temperature signal from the gas in the suc-
tion line. For 7/8" O.D. and larger suction lines,
use 4-o'clock or 8-o'clock position. Alternately,
the sensing bulb may be located on a descending
vertical section of the suction line.
NOTE : Units with coil “less TXV” are shipped
with 3/8” Chatleff male refrigerant distributor and
with nut and liquid line stubout (3/8” copper tube).
NOTE : On a “less TXV” coil THERE IS NO PIS-
TON METERING DEVICE PRESENT except with
the R-22 “orifice” option. The customer may size,
select and field install a piston to provide metering
without a TXV. For best results, use of the facto-
ry TXV is recommended. Field installable TXV is
available as an accessory.
FIELD INSTALLED TXV—Factory Provided
(Figure 2) Install Factory TXV by threading on to
the distributor.
Remove piston (if present) from
distributor. Make sure Teflon gasket (ref Fig.
1) is present and in good condition, at the distrib-
utor and on the TXV. Connect equalizer line to
schrader valve connection at the coil.
Figure 2
TXV Installation
Figure 1
Orifice Metering Option
FIELD INSTALLED TXV—Field Provided
Install field-provided TXV outside the unit cabi-
net in the liquid line.
NOTE: Remove piston (if
present) from distributor. Make sure Teflon
gasket (ref Fig. 2) is present and in good condi-
tion, at the distributor. Connect equalizer line to
schrader valve connection at the coil. Use a
schrader depresser fitting or remove the schrad-
er valve body so that the equalizer line reads the
suction line pressure. It is also acceptable to
braze-in a separate equalizer connection next to
the factory connection.