5.3002.16 Setting of Air Handler—Mid and High Rise

Topic: 
Forced Air
Subtopic: 
Site Preparation
Desired Outcome: 
Air handler is 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.
TitleSpecification(s)Objective(s)
5.3002.16a
Location

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

Equipment will be properly isolated from pollutant sources

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 the equipment from bulk water and moisture

Prevent exposure to air pollutants

5.3002.16b
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 the equipment has proper clearances for fire risk and accessibility

Ensure the equipment operates as designed

5.3002.16c
Connections

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

Equipment will be installed so that the drain pan operates properly

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

5.3002.16d
Support: horizontal air flow, attics, and other spaces

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

Vibration pads/isolators will be installed

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

Avoid compressing or disturbing attic insulation

5.3002.16e
Support: horizontal air flow and basement

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

Connection to structure will be enough to support weight

Vibration pads/isolators will be installed

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

Avoid compressing or disturbing insulation

5.3002.16f
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

Vibration pads/isolators will be installed

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

Properly support equipment

Prevent a fire hazard

Ensure platform does not impede air flow

5.3002.16g
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

5.3002.16h
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 sealing is durable

Do not increase resistance to air flow

5.3002.16i
Drainage

A secondary drain pan 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

The float switch will be interlocked with the cooling circuit in order to turn off the equipment when a leak occurs

Prevent water damage