13
Installation
WARNING
Refrigerant leaks are unlikely; however, if a refrigerant
leak occurs, open a door or windows to dilute the
refrigerant in the room. Turn o the unit and all other
appliances that may cause a spark. Call a licensed
professional HVAC technician (or equivalent) to repair
the leak.
Use only R410A refrigerant to charge this system. Use
of other refrigerant or gas will damage the equipment.
Do not allow air or other contaminants to enter system
during installation of refrigerant piping. Contaminants
will result in lower system capacity and abnormally high
operating pressures and may result in system failure or
explosion.
Insulate all refrigerant piping.
Refrigerant pipes may be very hot during unit operation.
Do not allow contact between wiring and bare copper
pipes.
After refrigerant piping connections have been
completed, check the system for leaks per commissioning
instructions.
WARNING
Do not install this unit so that it impedes the ow of com-
bustion air or exhaust air.
Do not run fossil fuel lines though control box enclosure.
Installation Steps
1. Determine best location and set furnace, coil and
outdoor unit.
2. Prepare the indoor unit coil for brazing.
3. Run vapor line piping between the outdoor unit and
the indoor unit coil.
4. Connect liquid line piping between the outdoor unit
and the control box.
5. Connect liquid line piping between the control box and
the indoor unit coil.
6. Mount coil sensor sockets to coil at the location shown
in Figure 18.
7. Connect the coil and return air sensors.
8. Connect power wiring to outdoor unit, control box and
air handler/furnace.
9. Mount the receiver to the outside of the control box
and connect the wiring harness to the control box
PCB.
10. Connect communication wiring between the outdoor
unit and the control box using 18 GA stranded,
shielded, two-conductor, polarity sensitive wiring.
11. Connect control wiring between the air handler/
furnace control relay and the air handler/furnace PCB
using 18 GA stranded, shielded, 4-conductor, polarity-
sensitive wiring.
12. Connect control wiring between the control box and
the V0STAT51P-3 controller using 18 GA stranded,
shielded, 4-conductor, polarity sensitive wiring.
13. Pressure test, evacuate and add additional refrigerant
to the system piping.
14. Follow the prescribed system start up processes.
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