COMFORT-AIRE | B-VMH30 | Unit installation | COMFORT-AIRE B-VMH30 Unit installation

VMH 09/12/18/24 SD
Inverter Single Zone
Ductless Mini-Split
Heat Controller • 1900 Wellworth Ave. • Jackson, MI 49203 • (517)787-2100 •
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
Safety Precautions
Warnings and Cautions........................................................................................................ 3
Installation Instructions
Installation Location Selection........................................................................................... 4-5
Accessories.......................................................................................................................... 6
Indoor unit installation........................................................................................................ 7-8
Outdoor unit installation........................................................................................................ 9
Refrigerant Pipe Connection
Refrigerant line set installation........................................................................................... 10
Leak test, evaluation and release of refrigerant................................................................. 11
Electrical Work
Electrical Precautions......................................................................................................... 11
Unit wiring........................................................................................................................... 12
Initial Start Up and Checks
Indoor/outdoor communication cable................................................................................. 13
Outdoor power/communication wiring................................................................................ 14
Field charging and final inspection..................................................................................... 15
! Caution
• Contact an authorized service technician for repair or maintenance of this unit
• Contact an authorized installed for installation of this unit.
• Installation work must be performed in accordance with local and national electrical codes and standards by authorized personnel only
Heat Controller
VMH 09/12/18/24 SD Inverter Mini-Split
• Read the follow SAFETY PRECAUTIONS carefully before installation.
• Electrical work must be performed by a licensed electrician. Be sure to use the correct rating of the power
cord and main circuit for the model to be installed.
• Incorrect installation due to ignoring the instructions will cause harm or damage.
The seriousness is classified by the following indications.
This symbol indicates the possibility of death or serious injury.
CAUTION! This symbol indicates the possibility of injury or damage to property.
The items to be followed are classified by the symbols:
This symbol denotes item that is PROHIBITED from doing.
Do not install without an authorized servicer/installer.
Install according to this installation instruction. If installation is defective, it can cause water leakage, or
electrical shock/fire.
Use the supplied accessories and specified parts for installation.
Install the indoor unit on a wall strong enough to hold the unit’s weight. Install the outdoor unit on a
raised concrete pad or blocks to provide a solid, level foundation. In a location with high winds, anchor
the unit and provide an air baffle. In snowy areas (for heat pump models), install the outdoor unit on a
raised platform higher than drifting snow. Provide snow vents.
For electrical work, follow local and national electric codes and these installation instructions. An
independent circuit and single outlet must be used. If electrical circuit capacity is not enough or defects
are found in electrical work, it will cause electrical shock or fire.
Use the specified cable and connect tightly. Clamp the cable so that no external force will stress the
connections. Loose wiring may overheat at the connection points and create a possible fire hazard.
Wiring routing must be properly arranged so that control board cover is fixed properly. If control board
cover is not fixed perfectly, it will cause overheating at connection point of terminal, fire or electrical shock.
When charging the unit, take care not to let air/substances other than the specified refrigerant
go into refrigeration cycle. Otherwise, it will cause lower capacity, abnormal high pressure in the
refrigeration cycle, explosion and injury.
Do not modify the length of the power supply cord or use an extension cord, and do not share
the single outlet with other electrical appliances. Otherwise, it will cause fire or electrical shock.
This equipment must be grounded It may cause electrical shock if grounding work doesn’t comply with
local/national electric codes.
Do not install the unit at place where leakage of flammable gas may occur. If gas leaks and
accumulates near the unit, it may cause fire.
Carry out drainage piping as mentioned in installation instructions. If not done correctly, water may
enter the room and damage personal belongings.
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
Selecting installation place
Choose a location that places the outdoor unit as close to the indoor unit as
possible. The maximum unit separation and vertical lift (compressor above the
evaporator) must be taking into account. Do not exceed allowable refrigerant
line lengths.
More than 6in.(15cm)
Indoor unit
• Unit must be installed in a location that does not obstruct the flow of air
and ensures clearances are maintained. (Fig. 1)
• The site must support the weight of the unit.
• The site must be easily accessible for cleaning or replacement of the air
filter, maintenance and service.
• The indoor unit should be mounted as high up on the wall toward the
ceiling, leaving a minimum of 6” (150mm) of space between the ceiling
and the top of the indoor unit. (Fig. 1)
• Due to the possibility of electronic interference with other devices, it is
recommended that there should be at least 3 ft (1 meter) between the unit
and other devices/appliances such as televisions or radios.
• The unit should be installed away from possible exposure to fire, smoke,
of flammable gases and be protected from direct sunlight (sunlight can
interfere with the signal between the unit and the remote controller.
More than 5in.(12cm)
More than 5in.(12cm)
More than 6.5ft.(2.0cm)
Fig. 1
More than 12in.(30cm)
More than
Outdoor unit
More than 24in.(60cm)
• If installation location allows the unit to be exposed to strong winds (such
as coastal applications), ensure that the unit has a wind barrier. This will
assist with preventing strong gusts of wind from entering the unit’s cabinet
and interfering with the fan operation. (Fig. 3 and Fig. 4)
More than
Fig. 2
Fig. 4
Fig. 3
wind gusts
Heat Controller
VMH 09/12/18/24 SD Inverter Mini-Split
• Avoid areas where water, snow, or ice may fall from the roof onto the unit.
• In climates where snow is a consideration, locate the unit away from areas prone to drifting.
• Ensure the location of the unit will not be subject to snow drifts, heavy accumulation of snow or leaves or other seasonal debris. If
unavailable, provide an awning for the unit. (Fig. 5 and Fig. 6)
1. An awning can be built over the outdoor unit to prevent direct sunlight, rain exposure, or snowfall.
2. Ensure that the awning does not impede the unit’s required clearances or obstruct air flow.
3. The awning should be at least 2 ft. (0.6m) away from the top of the unit’s housing.
• Ensure free flow of air into and out of the unit. All air inlet/outlets should be free of obstructions such as walls and shrubs. Minimum
clearances should be maintained. (Fig. 2)
• During heating and defrost modes (heat pump models only), the condensate should be properly drained away from the unit. Use the
included drain joint and seal along with locally purchased hose to do so. (Fig. 8)
• Do not locate two or more units in any way that will block discharge air from one unit to another. Be certain that hot air from one unit
will not blow into a nearby unit to prevent recirculation or discharge air. (Fig. 7)
Fig. 5
Fig. 6
More than 1ft (30cm)
More than 1ft (30cm)
More than 2ft (60cm)
(Service space)
Fence or
More than 2ft (60cm)
More than 2.5ft (70cm)
Fig. 7
Rooftop installation
• If the outdoor unit is installed on a roof structure, be sure to level the unit.
• Ensure the roof structure and anchoring method are adequate for the unit location.
• Consult local codes regarding rooftop mounting.
• If the outdoor unit is installed on roof structures or external walls, this may result in excessive noise and vibration, and may also be
considered a non-serviceable installation.
• Oil traps must be made in the refrigerant line set (every 10 ft.) when the outdoor unit is located above the indoor unit.
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
Name of Accessories
Wall Bracket
Plastic Dry Wall Anchor
5-8 depending on model
Self-tapping Screw A ST 3.9X25
5-8 depending on model
Seal (heat pump models only)
1 (Part 202720090001)
Drain Elbow (heat pump models only)
1 (Part 201101020011)
Remote Controller (with 2 AAA batteries)
Self-tapping Screw B ST2.9X10
Remote controller holder1
Nano silver air filter (field installed, not shown)
Note: Except for the parts provided above, all other parts needed for installation must be purchased
Tools needed for installation:
Level gauge
Electric drill, Hole core drill o 2.5”(65mm)
Flaring tool set
Adjustable wrench
Refrigerant leak detector or a bottle of soap water
Vacuum pump
Gauge manifold
Remote Controller
Pipe cutter
Tape Measure
Cable to wire units
Refrigerant line set for R-410A
Micron gauge
Mounting screw
Allen wrench set (metric)
Air F
Additional drain pipe
Remote Controller
Drain Elbow
“U” bend (cable)
Fig. 8
• This illustration is for explanation purposes only.
• Copper lines must be insulated independently.
Heat Controller
VMH 09/12/18/24 SD Inverter Mini-Split
Wall Bracket should be
flush with the interior wall
Indoor unit installation
1. Wall Bracket Mounting
A. There are two tabs on the back of the
indoor unit that hold the wall bracket onto
the unit. Press them down with a flat head
screwdriver to release the wall bracket from
the back of the unit.
B. Mount the wall bracket flush on structural parts
(studs) of the wall with proper unit clearances
in consideration. (Fig. 1 and Fig. 9)
NOTE: Any space between the unit and the
wall may cause noise or vibration.
C. Screw the wall bracket onto the wall with
type “A” self-tapping screws. If the wall
is made of brick, concrete or the like, drill
1/4” (5mm) diameter pilot holes in the wall.
Use anchors in conjunction with mounting
• Drill holes in the wall according to the stud
locations and corresponding mounting points
on the actual wall bracket that comes with your
unit. Wall brackets may vary by model and
specifications are subject to change.
• It is important to use all screws provided to
secure the wall bracket to the wall.
Fig. 9
VMH 09
(4.3in) 110mm
(7.1in) 180mm
VMH 12
(4.3in) 110mm
(5.5in) 140mm
VMH 18
(5.3in) 135mm
(10.2in) 260mm
VMH 24
Hole Diameter
02.56 in
Hole Diameter
02.56 in
2. Create Opening for refrigerant and
condensate lines
A. Determine hole position according to the
wall bracket that comes with your unit, the
unit’s required clearances (Fig. 1) and which
direction (left/right) the lines will be routed
from the back of your unit (Fig. 14). Drill
2.5”(65mm) hole angled downward (approx.
45°) toward the outdoors. (Fig. 11).
NOTE: Ensure that neither studs nor plumbing
are located directly behind the proposed hole
B. Always use a conduit to route the piping
through the hole in the wall. Properly seal
the hole after routing the pipes through to
prevent debris, insects, or small animals
from entering.
Fig. 10
Fig. 11
Fig. 12
3. Condensate Drainage
A. Run the drain hose sloping downward. Do not
trap the drain hose. Do not install the drain
hose as illustrated in Fig.12.
B. When extending the drain hose, with locally
purchased hose, insulate the connection
with armaflex or similar pipe insulation
material. (Fig. 13)
Do not block water flow by a rise
Pipe Insulation
Drain hose
Wall Cap
Fig. 13
Do not put the end of
drain hose into water
Extension drainhose
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
4. Refrigerant Line Installation
A. Remove the knockout from the desired side
of the unit that the line set will be routed from.
The lines from the unit can be routed either
left or right, left back or right back (Fig. 14).
B. Remove the clamp (Fig. 14) before attempting to bend the line set to prevent kinks. The
clamp may be replaced and used to hold
the line set in place, but this depends on the
routing direction of the line set and whether it
is needed, taking into account the line’s bend
Left Back
Right back
Fig. 14
C. Loosely run the line set connections from the
indoor unit through the hole in the wall.
D. Hang the unit onto the top flanges of the wall
bracket. Ensure the unit is properly seated.
(Fig. 15)
Top Flange
E. Keep the unit away from the wall to prevent
the line set from being kinked or crushed, use
a piece of styrofoam as a spacer between the
back of the unit and the wall. (Fig. 16)
Bottom Flange
F. Feed the condensate drain line and refrigerant line set through the hole such that the unit
can sit flush against the wall then remove the
Fig. 15
G.Push the bottom of the unit up and onto the
lower flanges of the wall bracket. Ensure that
unit is properly sealed.
H. Be sure that the overall installation of the
indoor unit and installation plate are flush
against the wall and level.
5. Piping and insulating
Fig. 16
A. Bundle the tubing, connecting cable*, and drain
hose with tape or wire ties as shown in (Fig.17).
Indoor Unit
B. Be sure to arrange the drain line such that it
is at the lowest point within the bundle as they
exit the unit and hole in the wall to the outdoors. (Fig. 17)
Ponding box
C. Because the condensed water from rear of
the indoor unit is gathered in the ponding, do
not put anything else in this area.
Tape/wire tie
Drain line
Fig. 17
D.Insulated the liquid line and suction lines
Line set
Heat Controller
VMH 09/12/18/24 SD Inverter Mini-Split
Outdoor Unit Installation
• Install the outdoor unit on a rigid base such as a
concrete slab, to prevent increasing noise level and
• Use a raised concrete pad or concrete blocks to
provide a solid, level surface. Securely anchor the
unit down with bolts.
• In a snowy area, slab should be higher than drifting
• See outdoor installation location information on page
4 for more details and acquired clearances.
Air inlet
Anchoring outdoor unit
Air inlet
Anchor the outdoor unit to the concrete slab with lag
NOTE: Lag bolts are field provided and do not come
with the unit.
Air outlet
Refer to unit’s mounting footprint for mounting hole
locations A & B. (Fig. 18)
Fig. 18
VMH 09
VMH 12
29.9 in.
(760 mm)
11.2 in.
(285 mm)
23.2 in.
(590 mm)
32.4 in.
(823 mm)
20.9 in.
(530 mm)
11.4 in.
(290 mm)
33.3 in.
(845 mm)
12.6 in.
(320 mm)
27.6 in.
(700 mm)
35.7 in.
(908 mm)
22.0 in.
(560 mm)
13.2 in.
(335 mm)
VMH 24
36.7 in.
(900 mm)
12.9 in.
(315 mm)
35.1 in.
(860 mm)
40 in.
(980 mm)
24.1 in.
(590 mm)
13.6 in.
(333 mm)
Condensate Drainage
• Condensate and defrosted water, created by the unit operating in heat mode, should be routed and drained away from the unit.
• Fit the seal onto the drain elbow, then insert the
drain elbow into the hole on the base pan of the
outdoor unit, rotate it 90° to secure into place.
(Fig. 19)
• Connect a locally purchased drain and insulated
hose to the hose barb end of the elbow.
• Route the hose to drain location away from
the unit.
Some models may have more then one drain hole in
the base of the unit.
Drain elbow
Fig. 19
Base pan hole of
outdoor unit
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
Refrigerant Line Set Installation
Refrigerant Line Set Installation
• Use copper tubing suitable to withstand
pressures for R-410A refrigerant. We
recommend a min. wall thickness of 0.027in.
11. The tube size should always be the same
diameter as the connections provided at the
service valves of the outdoor unit.
Note: On some models, a reducer or an
expander may be shipped with the indoor unit
in order to adapt the line set connection to
the proper size to mate with the indoor unit’s
connection. Be sure to check for this part, should
you discover that the outdoor units service valve
sizes differ from the indoor unit. If this part is
shipped with the indoor unit, then it is required to
be used.
12.Up sizing/downsizing the refrigerant lines/
connections can result in inadequate oil return to
the compressor or excessive refrigerant return
and will void the warranty.
13.Do not over torque the connections, excessive
force can break the flare nut.
14. When routing the line set between the outdoor
and indoor units:
A. Support the tubing adequately to avoid sags
that can trap the oil.
B. Isolate the tubing so it does not transmit
noise from vibration into the structure of the
C. Avoid sharp edges that could cut the tubes.
D. Trap rises every 10 ft. (5-7m) with a ‘p’ trap.
When outdoor unit mounted above
indoor unit.
1. Purchase line sets through a Heat Controller
distributor with consideration of the minimum and
maximum line lengths. (Fig, 20)
2. Ductless mini-splits require both-liquid and
suction-lines to be insulated.
3. Connections are made via flare nuts.
4. The number of bends and length of refrigerant
lines determine the pressure drop which affects
capacity and efficiency of the system, as well
as oil return. Minimize the length and number of
bends when possible during installation.
5. Minimum line set length must be maintained,
even if the installation does not require it. Extra
length that is unnecessary can be coiled up near
the outdoor unit (Do not to block air inlets/outlets).
6.Choose a location that places the outdoor unit as
close to the indoor unit as possible to minimize
line set lengths.
7. Use only clean, refrigerant grade tubing suitable
for R-410A.
8. Avoid installing refrigerant lines on wet/rainy
9. Always keep tube ends sealed until the final
connections are to be made.
10. If line sets are being made at the time of
installation, rather than being purchased, be sure
• Remove burrs from cut ends of the tubing
• Use tube benders to prevent kinking.
• Ensure tube cuts are square in relation to the
end of the tube.
• Use the proper diameter tube and flare nut
sizes recommended by the manufacturer.
• Insulate both lines with Amraflex of equivalent
with a wall thickness of at least 3/8”.
Fig. 20
Model No.
Refrigerant Piping
VMH 09
VMH 12/18
VMH 24
Liquid Side-Gas Side
1/4 - 3/8
1/4 - 1/2
3/8 - 5/8
Max. Refrigerant Pipe
Length Unit Separation*
82 (25)
82 (25)
98 (30)
98 (30)
Max. Level
Difference/Vertical Lift**
33 (10)
33 (10)
66 (20)
66 (20)
*Minimum pipe length must not be less that 10 feet.
** Trap rises every 10 feet (5-7m) with a ‘p’ trap when outdoor unit is mounted above
the indoor unit.
Heat Controller
VMH 09/12/18/24 SD Inverter Mini-Split
Leak Test, Evacuation & Release of Refrigerant
It is illegal to discharge refrigerant into the
atmosphere. Use proper reclaiming methods
and equipment when working on the refrigerant
containing parts of the unit. Service should be
performed by a QUALIFIED service agency and
certified technicians.
The condensing unit is supplied with a R-410a
factory approximately 25 ft. (7.6m) of line charge,
sufficient for most matching evaporator units.
Charge must be added for interconnecting tubing.
See Field Charging Section of this manual.
The unit’s service valves are shipped in the closed
position and should not be opened until final
connections and evacuation are completed.
Electrical Precautions
The recommended procedure for leak test, evacuation,
and release of refrigerant is outlined below:
1. Complete the final piping connections to the indoor
and outdoor units using high temperature brazing
2. Connect a charging manifold to the service ports
provided at the service valves.
3. Pressurize the lines and evaporator with nitrogen
and leak check all connections with soap bubbles.
Repair as necessary any faulty joints. If brazing is
required be sure to RELEASE THE NITROGEN
FIRST. Re-test as needed.
4. Connect a vacuum pump to the manifold center
connection, start the pump and open the manifold
5. Evacuate to 500 microns or less for a minimum of
30 minutes. Close the manifold valves and shut off
the pump. Note the vacuum reading and wait 15
minutes. Take a new vacuum reading. A reading
of 800 microns or higher indicates the presence of
moisture or a leak.
6. Repair as necessary and repeat steps 3, 4 & 5.
7. Confirm that manifold valves are closed and
disconnect the vacuum pump.
8. Remove the caps from the services valves. Open
the valves to the fully ‘back-seat’ position. Replace
service valve caps and tighten.
1. Refer to the unit’s rating plate for power supply voltage. Ensure adequate electrical supply
is available.
2. Ensure the air conditioner is properly grounded.
3. Connect wiring to the unit according to the electrical diagram located on the unit.
4. All wiring must comply with local and national electrical codes and be installed by a qualified electrician.
5. An individual branch circuit must be available.
6. Properly size the HACR breaker/fuse based on nameplate date.
7. Improper connections and inadequate grounding can cause injury or death.
8. Connect all wiring tightly. Loose wiring may cause overheating at connection points and
create a possible fire hazard.
9. Match terminal strip numbers/labels and colors between indoor and outdoor wiring. Erroneous wiring may cause fire/shock.
10. Always use strain reliefs and outdoor cable cover to protect wiring.
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
Unit Wiring
The contractor is to provide an individual branch
circuit for over current protection for the unit as
required by code. Some codes may require a
disconnect between the indoor and outdoor unit.
Run power supply wiring through a weatherproof
disconnect box and conduit to the unit connection.
Disconnects are required to be within sight and
easy reach of the unit (usually within 3 feet).
Circuit breakers and disconnect switches should
be properly sized based on the required codes and
the unit’s nameplate requirements. (Fig.21)
• Before performing any electrical work, ensure
all power is off. Electrical shock may occur.
• All outdoor unit’s capacitor’s to discharge
otherwise electrical shock hazard may occur.
• Ensure the unit is properly grounded.
Check the unit wiring diagram for the number of
conductors required. Ensure that the proper AWG
(gauge) and type of wired is used to comply with
code and the unit’s nameplate. Route neatly and
protect from sharp edges and damage.
All electrical wiring must be done according to
local codes. Additionally installations in the USA,
must conform to the current National Electric Code
(NEC) and Installations in Canada must conform to
current Canadian Electric Code (CEC). Nameplate
data indicates the operating voltage, phase,
ampacity, maximum over current protection, and
minimum voltage.
Inadequate wiring and/or improper electrical
supply will likely result in failure of the compressor
and other electrical components and voids the
1 Phase
1 Phase
1 Phase
1 Phase
NOTE: Subject to change. Always refer to unit’s nameplate.
Fig. 21
Power supply cord
Power supply
1 o 208-230V~60Hz
Branch circuit breaker
Heat Controller
VMH 09/12/18/24 SD Inverter Mini-Split
Electrical Work
Communicating Cable
Indoor Wiring
1. Wiring must conform to local and national electric
2. Lift the indoor unit’s panel up, remove the
electrical box cover by loosening the screw as
shown in (Fig.22).
Fig. 22
3. Connect each conductor to the terminal of the
indoor unit (L1, L2, S and Ground) based on the
labels of each terminal (Fig. 23).
4. Use strain relief to secure the cable (Fig. 23).
5. Ensure the wire color and location to and from
each terminal are identical between the indoor
and outdoor terminal strips.
Electrical box cover
6. Wrap any loose cables not connected with
terminals with electrical tape, so that they will not
touch any electrical components.
Terminal block of indoor unit
7.Refer to the wiring diagram located on the
outdoor unit and/or under the front panel of the
indoor unit for proper wiring
8. Heat Controller recommends using 600V THHN
14AWG/4 conductor unshielded stranded copper
cable, however local and national codes for wire
should always be followed based on your specific
To outdoor unit
To outdoor unit
Fig. 23
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
Electrical Work
Outdoor unit power and
communication cable wiring
Outdoor Unit
To power supply
1. Remove the electrical control cover from the
outdoor unit (Fig. 24).
er 1
2. Connect power supply wires to the right side of
the outdoor unit’s terminal strip. (Fig. 25)
Conduit panel
3. Connect the green/yellow ground from the power
supply wire to ground terminal. (Fig. 25)
Connecting cable
Power supply cord
4. Connect the communication cable from the
indoor unit to the outdoor unit’s terminal strip on
the left side. (Fig. 25)
Cover control
Fig. 24
5. Connect the ground wire of the communication
cable to the ground terminal. (Fig. 25)
6. To prevent water from entering in the unit, form a
loop in the cable (Fig. 26).
7. Insulate any unused conductors with electrical
tape, so that they do not touch any other
exposed electrical or metal parts.
Fig. 26
Fig. 25
Terminal block of outdoor unit
Air inlet(rear)
Air inlet(side)
To indoor unit
To power supply
Loop the cable
Air outlet
To indoor unit
To power supply
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.
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.
All panels must be installed, main power turned on
and the wiring, refrigerant lines, and condensate
drain lines properly connected before operating the
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.
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.
These units should be critically charged to ensure
proper performance. Some systems may require
additional charging of refrigerant, depending on
line set lengths.
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.
09, 12, 18
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.
Manual control button
Fig. 27
VMH 09/12/18/24 SD Inverter Mini-Split
Heat Controller
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