Test Run; Pre-Checks; Procedure; Test Run Checklist - Lennox MHA Series Installation Instructions Manual

Table 10. Indoor Unit Error Codes
Display Error Information
P3 Outdoor ambient temperature too low.
p4 Inverter compressor drive error

Test Run

Pre-Checks

Only perform test run after you have completed the
following steps:
• Electrical Safety Checks – Confirm that the unit's
electrical system is safe and operating properly.
• Refrigerant Leak Checks – Check all flare nut connec­
tions and confirm that the system is not leaking.
• Confirm that suction and liquid valves are fully open.

Procedure

You should perform the Test Run for at least 30 minutes.
1. Connect power to the unit.
2. Press the ON/OFF button on the remote controller to
turn it on.
3. Let each function run for 5 minutes, and perform the
following checks:

Test Run Checklist

Table 11. Test Run Checklist
Checks
No electrical leakage
Unit is properly grounded
All electrical terminals properly
covered
Indoor and outdoor units are solidly
installed
All pipe connection points do not leak
Water drains properly from drain hose
All piping is properly insulated
Unit performs COOL function properly
Indoor unit louvers rotate properly
Indoor unit responds to wireless
remote

Double-Check Line Set Connections

During operation, the pressure of the refrigerant circuit
will increase. This may reveal leaks that were not present
during your initial leak check. Take time during the Test
Run to double­check refrigerant line set connections and
verify there are no leaks.
1. Using the wireless remote control, return unit to the
normal operating temperature.
2. Using insulation tape, wrap the indoor refrigerant pipe
connections that you left uncovered during the indoor
unit installation process.
Pass Fail
19
Ambient Temperature is Below 63ºF (17ºC)
After installation, confirm that all electrical wiring is
installed in accordance with local and national regulations,
and according to the installation instruction.
You cannot use the wireless remote control to turn on the
COOL function when the ambient temperature is below
63°F (17°C). In this instance, you can use the MANUAL
CONTROL button on the indoor unit to test the COOL
function.
1. Lift the front panel of the indoor unit, and raise it until
it clicks in place.
2. The MANUAL CONTROL button is located on the
right­hand side of the unit. Press it two times to select
the COOL function. See "Figure 40. Manual Control
Button".
3. Perform Test Run as normal.
Figure 40. Manual Control Button
Indoor Unit Control Box
Area (under front panel)
Manual Control Button