Reznor CAUA Unit Installation Manual - Manual (Page 6)

Form I-CAUA, P/N 164771 R8, Page 6
Vibration Isolation
Pads, Option PC4
4.0 Clearances
and
Dimensions
(cont'd)
Determine the position of the heater with regard to clearances, venting, combustion air,
gas supply connection, electrical supply connection, and the inlet air opening. The inlet
air opening may be in the right side, in the left side, in the rear, or in the bottom of the
cabinet (See FIGURE 1) and must be cut by the installer.
CAUTION: Use tin snips or aviation shears to cut the inlet air
opening. Use caution as the cut edges of the metal will be
sharp.
Either cut out the inlet air opening now or when attaching the ductwork, filter cabinet,
or mixing box. If the application includes an optional bottom filter cabinet, either lay the
heater down (note weight in TABLE 1) and cut the opening now or cut it out from the
inside after the heater is placed on the bottom filter cabinet. NOTE: If ordered with an
optional inlet base, the heater is shipped with a factory provided opening in the bottom.
5.0 Positioning
and Mounting
If the installation includes optional vibration isolation pads, tip the corner of the unit
enough to slide a pad underneath. Remove the access panel and secure the pad to the
cabinet with the screw provided. Repeat the procedure at all four corners.
PRESSURE TESTING SUPPLY PIPING
Test Pressures Above 1/2 PSI: Disconnect the heater and manual valve
from the gas supply line which is to be tested. Cap or plug the supply line.
Test Pressures Below 1/2 PSI: Before testing, close the manual valve on
the heater.
All piping must be in accordance with requirements outlined in the National Fuel Gas
Code ANSI Z223.1a (latest edition) or CAN/CSA-B149.1 and B149.2 (See Paragraph
1). Gas supply piping installation should conform with good practice and with local
codes.
Unit heaters are orificed for operation with natural gas having a heating value of 1000
(± 50) BTU per cubic ft or propane gas with a heating value of 2550 BTU per cubic ft.
If the gas at the installation site does not meet these specifications, consult the factory
for proper orificing.
6.1 Gas Piping and
Pressures
6.0 Mechanical
TABLE 2 - Required
Clearances
Clearances inches mm
Right Side 0 0
Left Side 0 0
Front 36 914
Rear 0 0
Bottom 0 0
Flue Connector 6 152
Top 1 25
4.2 Clearances
The unit must be installed so that the clearances in TABLE 2 are provided for service
and inspection and for proper spacing from combustible construction. Clearance to
combustibles is defined as the minimum distance from the heater to a surface or object
that is necessary to ensure that a surface temperature of 90°F above the surrounding
ambient temperature is not exceeded.
WARNING:
This appliance is equipped for a maximum gas supply
pressure of 1/2 psi, 3.5 kPa, or 14 inches water column.
Supply pressure higher than 1/2 psi requires installation of
an additional lockup-type service regulator external to the
unit.