Weather-Rite TT Series Installation, Operation & Service Manual - Warning

TT-S

ERIES

 I

NSTALLATION

, O

PERATION

AND

 S

ERVICE

 M

ANUAL

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SECTION 3: CRITICAL CONSIDERATIONS

3.1 Required Clearances to Combustibles

Clearances are the required distances that 

combustible objects must be away from the air 

handler to prevent fire hazards. Combustibles are 

materials that may catch on fire and include common 

items such as wood, paper, rubber, fabric, etc. 

Maintain clearances to combustibles at all times 

for safety.

Check the clearances on each air handler being 

installed to make sure the product is suitable for your 

application and the clearances are maintained.

Minimum clearances for all models are as follows:

• 18" (45.7 cm) Above the top of the equipment

• 18" (45.7 cm) Along the sides of the equipment

• 18" (45.7 cm) Under the floor of the equipment

(when suspended)

Read and follow the safety guidelines below:

• Locate the air handler so that the air intakes are 

not too close to any exhaust fan outlets (refer to 

applicable codes for minimum distance to exhaust 

fan outlets), gasoline storage, propane tanks or 

other contaminants that could potentially cause 

dangerous situations. 

• Keep gasolines or other combustible materials 

including flammable objects, liquids, dust or 

vapors away from this air handler or any other 

appliance.

• Maintain clearances from heat sensitive material, 

equipment and workstations. 

Clearances to combustibles do not denote 

clearances for accessibility. Minimum clearance 

for access is 48" (122 cm). Minimum clearance for 

accessibility applies to the control enclosure, 

blower access panel and filter access panel 

(when equipped). 

The stated clearances to combustibles represent 

a surface temperature of 90 °F (50 °C) above 

room temperature (90 °F [50 °C] plus ambient 

temperature). Building materials with a low heat 

tolerance (i.e. plastics, vinyl siding, canvas, tri-ply, 

etc.) may be subject to degradation at lower 

temperatures. It is the installer's responsibility to 

assure that adjacent materials are protected from 

degradation. Maintain clearances from heat 

sensitive material, equipment and work stations.

• Maintain clearances from vehicles parked below 

the air handler. 

See Page 11, Section 4.4.

3.2 Purge of Supply Duct

If this heating unit is to be installed indoors, and its 

outdoor air supply ducted from outdoors, ANSI 

Standards Z83.4/CSA 3.7, Z83.18 and Z83.25/CSA 

3.19 require that all supply duct shall be purged a 

minimum of four times prior to any ignition attempt. If 

the volume of the outdoor air supply duct exceeds 

the heating unit's ability to complete the required four 

air changes prior to ignition, you must contact the 

factory to purchase an extended purge card of the 

appropriate duration to meet this requirement.

3.3 Hardware

Unless otherwise specified, all hardware must be 

torqued to settings from

 Page 10, Table 1.

Table 1: Recommended Torque Settings

WARNING

Fire Hazard

Keep all flammable objects, liquids and 

vapors the minimum required clearances to 

combustibles away from equipment.

Some objects will catch fire or explode when 

placed close to equipment.

Failure to follow these instructions can result 

in death, injury or property damage.

Bolt Head

Grade Marking

Nut Grade

Marking

Bolt Size

Grade 2

Grade 5

10-24

27 in•lb

42 in•lb

1/4-20

65 in•lb

101 in•lb

5/16-18

11 ft•lb

17 ft•lb

3/8-16

19 ft•lb

30 ft•lb