7
www.InWallDehumidifier.com | (800) 533-7533
Ultra-Aire MD33 Installation Instructions
A 10' long power cord is included for installations where a plug in connection is permitted in accordance with
the National Electrical Code and local codes and ordinances. A dedicated 15A circuit and GFCI receptacle
are recommended. Electrical connections inside the device are made with the included wire nuts. Route the
cord through the appropriate knockout and secure with the non-metallic cable clamp.
If not using the included 10' power cord,
ensure that the electrical connection and
wire size are adequate and in conformance
with the National Electrical Code,
ANSI/NFPA 70 – latest edition and all local
codes and ordinances. Use flexible,
armored, or non-metallic sheathed, copper
wire with grounding conductor. Use the
included non-metallic cable clamp as required.
• The Ultra-Aire MD33 requires 120-volt,
60 Hz, AC-only, 15 amp, fused and
grounded electrical supply.
• A visible circuit breaker or disconnect
switch near the unit is required for
maintenance and service.
• A dedicated circuit is recommended.
• Use of a UL listed or CSA approved
strain relief is required.
ELECTRICAL REQUIREMENTS
Wiring Schematic
DRAIN INSTALLATION CONSIDERATIONS
Consult local building codes for condensate drain restriction and additional requirements. The Ultra-Aire
MD33 is provided with 10
'
of 3/4
"
I.D. drain hose. Verify drain hose length is appropriate for application.
The hose must be connected to the drain port and routed down the wall cavity and into the air conditioning
condensate drain or other acceptable drainage.
• For gravity drainage, the bottom of the unit must be at, or above the drain height.
• Avoid any entrapment of stagnant water within the hose.
• Consider 1/4" drop for every foot of drain hose.
• Codes may dictate that a drain trap is necessary before or near to the main building drain.
Be sure to install the metal cover over the top of the hose. This prevents air from entering the unit through
the wall cavity.
