5.3002.7 Setting of Air Handler—Low Rise

Topic: 
Forced Air
Subtopic: 
Site Preparation
Desired Outcome: 
Air handler set properly in an appropriate place
Note: 
The authority having jurisdiction may require that a licensed professional perform certain tasks outlined in this detail.
For supporting material, see Referenced Standards and Building America Solution Center.
TitleSpecification(s)Objective(s)
5.3002.7a
Location

Equipment will be installed in a dry location within the conditioned space when feasible

Equipment will be properly isolated from pollutant sources (e.g., garages)

Equipment will be installed in a manner to provide ease of access for routine maintenance/service

All work will be done by a licensed professional or qualified person

Prevent rust and corrosion

Protect equipment from bulk water and moisture

Prevent exposure to garage air pollutants

Ensure that equipment is maintained/serviced

5.3002.7b
Clearance

Equipment will be installed with proper clearances in accordance with local codes and manufacturer specifications

Alternative locations will be considered for equipment when existing locations are not suitable

Ensure equipment has proper clearances for fire risk and accessibility

Ensure equipment operates as designed

5.3002.7c
Connections

Equipment will be installed so connections allow proper operation of the equipment and accessibility (e.g., electrical service, condensation drains, ductwork, fuel, venting, refrigerant lines)

Equipment will be installed so the drain pan operates properly

Ensure connections do not interfere with the operation and service of the equipment

5.3002.7d
Support: horizontal air flow, attic

Equipment will be supported with a nonwicking fireproof platform or suspended with a threaded rod in accordance with local codes and manufacturer specifications

Equipment will be placed on vibration pads

Ensure equipment is stable, level, and does not transmit vibration

Avoid compressing or disturbing attic insulation

5.3002.7e
Support: horizontal air flow, basement, or crawl space

Equipment will be supported with a nonwicking, fireproof material or suspended with a threaded rod in accordance with local codes and manufacturer specifications

Equipment will be placed on vibration pads

Ensure equipment is stable, level, and does not transmit vibration

Avoid compressing or disturbing insulation

5.3002.7f
Support: up flow on a platform

Equipment will be supported on nonflammable material capable of supporting the weight of the equipment

Air handler opening will be free of obstructions

Equipment will be placed on vibration pads

Properly support the equipment

Prevent a fire hazard

Ensure platform does not impede air flow

5.3002.7g
Support: down flow

Equipment will be supported on ductwork capable of supporting the weight of the equipment

Equipment will be supported on ductwork with rigid exterior insulation fastened to the ductwork

Properly support equipment

Protect equipment from moisture damage

Reduce heat loss

5.3002.7h
Sealing

Gaps larger than 1/4" between air handler and adjoining ductwork or equipment (e.g., evaporator coil, filter rack) will be bridged with sheet metal, and sealed with mastic and fiberglass mesh

All air handler joints will be sealed with mastic and fiberglass mesh

Air handler joints and non-service openings will be sealed to eliminate all gaps with NFPA NFPA National Fire Protection Association, www.nfpa.org 90A and B approved sealant

If unit is installed in a building cavity, the cavity must be sealed prior to the installation to eliminate any return air leaks from adjoining chases

Ensure air handler does not leak air

Ensure the sealing is durable

Prevent increased resistance to air flow

5.3002.7i
Drainage

A secondary drain pan and drain line that provides proper pitch and a float switch will be installed beneath equipment located in areas where water damage may occur, such as attics and conditioned spaces

Float switch will be interlocked with the cooling circuit to disable AC when leak occurs

Prevent water damage