428 01 9700 03
7
Make Piping Sweat Connections
Remove plastic caps from liquid and suction service valves.
Use refrigerant grade tubing. Service valves are closed from
the factory and are ready for brazing. After wrapping the
service valve with a wet cloth, the tubing set can be brazed
to the service valve using either silver bearing or non
−
silver
bearing brazing material. Consult local code requirements.
Refrigerant tubing and the indoor coil are now ready for leak
testing.
NOTE
: Unit is shipped with R
−
410A refrigerant factory
charge indicated on nameplate.
Pass nitrogen or other inert gas through piping while brazing
to prevent formation of copper oxide.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves observe
the following:
Use a brazing shield.
Wrap service valves with wet cloth or use a heat
sink material.
Provide Safety Relief
A fusible plug is located in unit suction line; do not cap this
plug. If local code requires additional safety devices, install
as directed.
Step 4
—
Make Electrical connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted or
unbroken ground to minimize personal injury if an
electrical fault should occur. The ground may consist
of electrical wire or metal conduit when installed in
accordance with existing electrical codes.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit failure as a result of operation on improper line
voltage or excessive phase imbalance constitutes
abuse and may cause damage to electrical
components. Such operation would void any
applicable warranty.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance, be sure
indoor unit main power switch is turned OFF and
indoor blower has stopped.
Power Wiring
Unit is factory wired for voltage shown on nameplate.
Provide adequate, fused disconnect switch within sight from
unit, readily accessible, but out of reach of children.
Provision for locking the switch open (off) is advisable to
prevent power from being turned on while unit is being
serviced.
Disconnect switch, fuses, and field wiring must comply with
the NEC and local code requirements. Use copper wire only
between the disconnect switch and unit. Use minimum 75C
wire for the field power connection.
Route power wires through the opening in unit side panel
and connect in the unit control box as shown on the unit
label diagram and Figure 7. Unit must be grounded.
LEGEND
NEC—
National Electrical Code
TB
—
Terminal Board
TB Connections
Field Wiring
Factory Wiring
—
—
A07428
Figure 7
-
Line Power Connections
Control Circuit Wiring
Control voltage is 24 v (40 va minimum). See Figure 8 and
Figure 9 and unit label diagram for field
−
supplied wiring
details. Route control wire through opening in unit side
panel to connection in unit control box.
NOTE
: Use No. 18 AWG color
−
coded, insulated (35
C
minimum) wire. If thermostat is located more than 100 ft.
(30.5m) from unit, as measured along the control voltage
wires, use No. 16 AWG color
−
coded wire to avoid excessive
voltage drop.
NOTE
: All wiring must conform to NEC and local codes.
NOTE
: Operating unit on improper line voltage constitutes
abuse and could affect warranty. See Table 2.
Do not
install unit in a system where voltage may fluctuate above or
below permissible limits.
See Table 2 for recommended fuse sizes. When making
electrical connections, provide clearance at the unit for
refrigerant piping connections.
NOTE
: The HC4H3 units use the control transformer
supplied with the matched indoor unit.
A07429
Figure 8
-
HC4H3 Typical Control Circuit Connections
