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Heat Controller, Inc. INSTALLATION INSTRUCTIONS HDG Series Air Handler
16
Terminal
Fan speed
Medium
High
Low
Fan
M1
M2
Red
Blue B lack
Black
Blue
Red
Blue
Red
Black
Fan speed switch congurations:
1. All motors are shipped from the factory at medium speed as default.
2. To charge the fan speed to high speed:
• Connect the black wire to the fan terminal
• Connect the blue wire to the M1 terminal
• Connect the red wire to the M2 terminal
3. To charge the fan spped to low speed
• Connect the blue wire to the fan terminal
• Connect the red wire to the M1 terminal
• Connect the black wire to the M2 terminal
The air distribution system has the greatest effect on airow. The duct system is totally controlled by the
contractor. For this reason, the contractor should use only industry-recognized procedures.
Heat pump systems require a specied airow. Each ton of cooling requires between 350 and 450 cubic
feet of air per minute (CFM), or 400 CFM nominally.
Duct design and construction should be carefully done. System performance can be lowered dramati-
cally through bad planning or workmanship.
Air supply diffusers must be selected and located carefully. They must be sized and positoined to deliver
treated air along the perimerter of the space. If they are too small for their intended airow, they become
noisy. If they are not located properly, they cause drafts. Return air grilles must be properly sized to carry
air back to the blower.If they are too small, they also cause noise.
The installers should balance the air distribution system to ensure proper quiet airow to all rooms in the
home. This ensures a comfortable living space.
An air velocity meter or airow hood can give a reading of system CFM.