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Note: For S-series furnaces, bend outlet flanges in-
ward or outward to suit installation. Coil and furnace
will nest together.
F. MAXIMUM AIRFLOW SETTING (CFM)
NOTE:
Water blow-off could occur in certain installation
positions if the airflow setting exceeds the maximum
values listed.
Maximum airflow settings (CFM)
Coil
Upflow
4PXCBU36BS3HAC
1350
4PXCBD36BS3HDC
N/A
4PXCDU60BS3HAC
2250
4PXCDD60BS3HDC
N/A
G. INSTALLING / BRAZING REFRIGERANT LINES
CAUTION
!
Do NOT open refrigerant valve at the outdoor unit until
the refrigerant lines and coil have been brazed, evacuated,
and leak checked. This would cause contamination of
the refrigerant or possible discharge of refrigerant to the
atmosphere.
1.
The following steps are to be considered when installing
the refrigerant lines:
a. Determine the most practical way to run the lines.
b. Consider types of bends to be made and space
limitations.
c. Route the tubing making all required bends and
properly secure the tubing before making final
connections.
NOTE:
Refrigerant lines must be isolated from the structure and
the holes must be sealed weather tight after installation.
IMPORTANT:
Do not unseal refrigerant tubing until ready to fit refrigerant
lines.
There is only a holding charge of dry air in the indoor coil,
therefore no loss of operating refrigerant charge occurs when
the sealing plugs are removed.
18-AD43D1-1C-EN
Figure 5
Horizontal
Horizontal
Downflow
Left
Right
1100
1200
1350
1100
N/A
1350
1850
2000
2250
1850
N/A
2250
Installer's Guide
Figure 6
NOTE:
TXV bulb MUST be protected (wrapped with wet rag) or
removed, while brazing the tubing. Overheating of the
sensing bulb will affect the functional characteristics and
performance of the comfort coil.
1.
Remove both rubber plugs from the indoor coil.
2.
Field supplied tubing should be cut square, round and free
of burrs at the connecting end. Clean the tubing to prevent
contaminants from entering the system.
3.
Run the refrigerant tubing into the stub tube sockets of the
indoor unit coil.
PAINTED AREAS OF THE UNIT MUST BE SHIELDED DURING
BRAZING.
4.
Flow a small amount of nitrogen through the tubing while
brazing.
5.
Use good brazing technique to make leakproof joints.
6.
Minimize the use of sharp 90 degree bends.
7.
Insulate the suction line and its fittings.
8.
Do NOT allow un-insulated lines to come into contact with
each other.
NOTE:
When replacing the TXV bulb, reinstall the bulb in the
proper orientation using the spring clip provided.
9.
Rewrap the TXV bulb, spring clip, and suction line with
insulation after spring clip is reinstalled.
NOTE:
The TXV setting may run high superheat when measured
at the outdoor unit (15-25 °F) for upflow and horizontal left
installations.
10. For optimal performance, the TXV bulb may be relocated
outside the coil cabinet after the field line brazing is
complete.
a.
Remove the bulb insulation and bulb clip.
b.
Lace the TXV bulb through the large coil panel
grommet.
c.
Assemble the TXV bulb to the field provided suction
line outside the unit. Ensure the bulb is mounted on
a straight, smooth section of 7/8" O.D. copper line.
The bulb should be clear of any field braze joints and
located away from any bends in the pipe.
3
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