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5.3 Connect Piping
•
Slide right front panel along field tubing while cautiously guid-
ing component wiring back through panel wire-way. (See
Figure 7.)
To prevent damage caused by heat when brazing the field
piping, cover the pipe insulation, the internal wiring, and the
thermal sensor inside the insulation with a damp cloth.
Otherwise, the sensor may be damaged by heat of brazing,
which leads to a failure of normal operation.
Field piping
Field piping fitting port (brazed)
Internal wiring
Figure 7
•
Braze up to the field piping fitting port while cooling
the sensor and the thermal insulation.
5.4 Re-assemble the Coil and Controls
•
Once heat from the brazed area has dissipated, route com-
ponent wiring back through the right panel wire-way.
•
Close the right and left front panels.
•
Re-install the control panel to the right front panel using
mounting location holes and factory supplied screws.
•
Do not allow component wiring to become pinched. Failure
to do so may lead to unit failure.
•
Reconnect Control Panel wiring to component wiring.
5.5 After the work is finished, make sure to check that there is
no gas leak. Follow the VRV Air Tight test procedure in the
outdoor unit installation manual.
5.6 After checking for gas leaks, be sure to insulate the piping
connections as shown in Figure 8.
Do not leave a gap
Gas piping
Piping heat insulation
material
Liquid piping
Cased
Coil
Figure 8
•
Be sure to insulate any field piping all the way, which is re-
quired insulation, to the piping connection inside the unit.
Any exposed piping may cause condensation or burns if
touched.
•
When brazing the refrigerant piping, perform nitrogen re-
placement first or perform the brazing while feeding nitro-
gen into the refrigerant piping. (Refer to Figure 9.)
Refrigerant piping
Part to be brazed Taping
Pressure-reducing valve
hands
valve
Nitrogen
Nitrogen
Figure 9
•
When brazing pipes while feeding nitrogen inside the pip-
ing, make sure to set the nitrogen pressure to 2.9 PSI or
less using the pressure reducing valve.
•
When following the VRV Air Tight test procedure during in-
stallation (refer to the outdoor unit installation manual for
details), only pressurize to 450 psig (3.01MPa).
