Comfort-Aire VMH 24 SD - Manual (Page 15)

15
Heat Controller VMH 09/12/18/24 SD Inverter Mini-Split
Initial Start-Up & Checks
Operation of the unit will depend on the setting of
the thermostat on the unit or the remote control.
Refer to the owner’s manual and remote control
manual for operating instructions.
IMPORTANT!
All panels must be installed, main power turned on
and the wiring, refrigerant lines, and condensate
drain lines properly connected before operating the
unit.
Test-Run / Initial Start-up
1. Press the ON/OFF button on the remote control
to turn the unit on.
2. Press the mode button on the remote control to
check that each mode (Cool, Heat*, Auto, Dry
and Fan only) works properly.
3. When the ambient temperature is too low (below
62°F/16°C) to run the unit in cooling mode to
check the system, the unit can be placed in
manual operation.
4. To place the unit in manual operation, gently
lift up the lower left and right sides of the front
panel unit it opens and clicks into a locked
position where it props itself open.
5. Under the unit’s front panel the cover to the
indoor electrical terminal strip has an oval
shaped opening labeled “AUTO/COOL”.
Through this opening, the “AUTO/COOL” button
can be accessed with a long, thin object, such
as a pen/flathead screwdriver.
6. Press the “AUTO/COOL” button and manual
operation will begin.
7. Manual operation will allow the unit to run for 30
minutes while any final inspections are made.
FIELd CHARgINg
Unit performance, efficiency, and life depends,
to a large extent, on a proper system charge.
Time spent on getting the charge right at start-up
will payoff in the long run. Operating conditions
such as voltage, air flow, evaporator coil size,
and indoor and outdoor temperature and humidity
all have an effect on the system pressures and
superheat conditions.
Condensing units are factory charged for the
outdoor and indoor unit with 25ft. (7.6m) of
refrigerant lines. Charge must be added for the
interconnecting tubing.
These units should be critically charged to ensure
proper performance. Some systems may require
additional charging of refrigerant, depending on
line set lengths.
FINAL INSPECTION
Do a final visual inspection of the entire installation.
Complete any final details and clean up.
Review Unit and Remote Control Operation with
the homeowner/user.
Ensure homeowner/user is provided with all
manuals, warranty cards, etc.
R = T X (L-25)ft
R(oz): Additional refrigerant to be charged
L(ft): The length of the refrigerant line
T(oz): The quantity of the charged refrigerant
per additional foot.
Model 09, 12, 18 24
oz/ft 0.16 0.32
Conduit panel
Connecting cable
Fig. 27
o AUTO/COOL
Manual control button