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Installation Instructions
8 Refrigerant Connections
f Keep the coil connections sealed until refrigerant connections are made.
Refer to the Bosch IDS Condenser Section Installation, Operation, and
Maintenance Manual for details on line sizing, tubing installation, and
charging information.
f Coil is factory charged with Nitrogen. Evacuate the system before charging
with refrigerant.
f Install refrigerant lines so that they do not block service access to the front
of the unit.
f Nitrogen should flow through the refrigerant lines while brazing.
f Use a brazing shield to protect the cabinet's paint and a wet rag to protect
the rubber grommet and input pipe's piston seal ring from being damaged
by torch flames. Use a wet rag or an approved heat paste to protect the
TXV sensing bulb during the brazing process. Refer to Figure 9.
f After the refrigerant line connections are made, seal the gap around the
connections with pressure sensitive gasket.
Use a wet rag to protect the sealing rings in the
input pipe from being damaged by torch flames
while brazing.
Wet rag
Figure 9
Protection during the brazing process
After the brazing work is finished, make sure to check that there is no refrigerant
leakage. After checking for vapor leaks, be sure to insulate the pipe connections,
refer to Figure 10.
16 |
Piping heat insulation
material
Figure 10
8.1 Condensate Drain Connection
The unit is supplied with primary and auxiliary condensate drains that have 3/4"
NPT connections. Both drains must be trapped outside the unit and piped in
accordance with applicable materials and building codes. Do not reduce the drain
line size less than the connection size on the drain pan. Condensate should be
piped to an open drain or to the outside. All drains must pitch downward away from
the unit a minimum of 1/4" per foot of line to ensure proper drainage. Insulate the
primary drain line to prevent sweating where dew point temperatures may be met.
(Insulation is optional depending on climate and application needs.)
Vapor line
Liquid line
Bosch BWA Series Air Handler - BTC 761703105 A (03.2023)
Do not leave a gap
Vapor line
Liquid line
Do not leave a gap
Insulation of pipe connections
I f cleanout tee is used, standpipe must be sealed/capped.
Air
handler
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