SECTION 3: CRITICAL C ONSIDERATIONS
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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 Z83.18 and Z83.4 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 on Page 9, Table 1.
Note: Inlet hood opening shall not be installed with
inlet opening facing into the prevailing wind direction
in order to help prevent the possibility of moisture
entrainment.
Table 1: Recommended Torque Settings
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
Bolt Head
Grade Marking
Nut Grade
Marking
Bolt Size Grade 8.8 Grade 10.9
M5 6Nm 9Nm
M6 10Nm 15Nm
M8 25Nm 35Nm
M10 50Nm 75Nm
M12 85Nm 130Nm
M16 215Nm 315Nm
8.8 10.9
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