Rooftop installation – Comfort-Aire VMH 24 SD User Manual
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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)
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.
Fig. 7
Fig. 5
Fig. 6
More than 1ft (30cm)
More than 1ft (30cm)
More than 2ft (60cm)
More than 2.5ft (70cm)
More than 2ft (60cm)
(Service space)
Fence or
Obstacles