Step 4 - Connect Refrigerant Piping; Iv. Step 4 − Connect Refrigerant Piping - Bryant 619E Installation, Start-Up And Service Instructions Manual

Fig. 4 — Refrigerant Piping
*538A, 538D/538S systems.
Fig. 5 — Maximum Line Lengths
IV. STEP 4 — CONNECT REFRIGERANT PIPING
Fan coil units may be connected to the outdoor units using
field-supplied refrigerant grade piping. Refer to Tables 4A-4E
for the correct size piping. The length of refrigerant pipe
depends on the unit placement and building structure; run
pipes as directly as possible. For piping requirements over
50 ft of total run, or more than 25 ft of lift, consult the long
line application guidelines available in the product presale
literature, or contact your local representative. For the 538S024
unit, the maximum pipe length is 50 ft.
CAUTION: The 619E unit is shipped with a factory
holding charge of R-22. DO NOT BURY MORE THAN
36 IN. OF REFRIGERANT PIPE IN THE GROUND. If
any section of pipe is buried, there must be a 6-in. ver-
tical rise to the valve connections on the outdoor unit.
If more than the recommended length is buried, refrig-
erant may migrate to the cooler, buried section during
extended periods of unit shutdown, causing refrigerant
slugging and possible compressor damage at start-up.
Use the following instructions to connect piping.
1. Install insulation. Insulate all refrigerant lines on heat
pumps and 538S systems to prevent condensation. It is
extremely important that all refrigerant lines and the
AccuRater metering device be insulated on heat pumps.
On 538A cooling only units, the liquid line may be left
uninsulated. Use any acceptable heat resistant closed-
cell foam insulation (minimum
insulating piping, cap ends and slide insulation over the
piping. Insulation can also be cut and placed over
piping.
2. Run liquid and gas refrigerant piping.
a. Run pipes as directly as possible, and avoid any un-
necessary turns and bends.
b. Suspend refrigerant pipes so that the insulation is
not damaged and vibrations are not transmitted to
the structure.
c. Leave slack in the refrigerant pipe between the struc-
ture and the unit to absorb vibrations.
d. Install factory-supplied flare connection and Accu-
Rater metering device in liquid line at the fan coil
unit on 538A and 538D systems (Fig. 9). Make sure
the arrow on the metering device body points AWAY
FROM the fan coil unit. Use Table 5 to verify that
the correct piston for your system has been shipped
with the unit.
NOTE: No AccuRater is installed on 538S systems. The 538S
systems have a TXV (thermostatic expansion valve) in the
condensing unit for refrigerant metering and control.
e. On heat pump installations, install factory-supplied
piston in the AccuRater metering device located in
the service valve on the outdoor unit (Fig. 10). Make
sure Teflon seal on the piston faces toward the out-
door unit. Use Table 5 to verify the correct piston for
your system has been shipped with the unit. Refer to
538D installation instructions for more details.
f. Install a liquid line filter drier near the outdoor unit
(538A and 538D). On heat pump systems, a bi-flow
filter drier must be used. DO NOT install a filter drier
in 538S systems.
3. Insulate and caulk wall openings to reduce air infiltra-
tion and refrigerant pipe vibrations on structure.
4. Evacuate piping, if necessary. If either refrigerant pip-
ing or the indoor coil is exposed to atmospheric condi-
tions, it must be evacuated to 1000 microns to eliminate
contamination and moisture in the system.
—5—
3 ⁄ -in. wall thickness). When
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