Reznor UBX Manual

DISCONNECT
SWITCH
LINE VOLTAGE
ENTRANCE
COMBUSTION AIR
PIPE COLLAR
A
C
B
D
GAS CONNECTION
TERMINAL STRIP
CONDENSATE DRAIN
VENT PIPE
Figure 3. Connections at Rear of Unit (Refer to Table 7)
Table 7. Connection Sizes and Locations
Dimension (See Figure 3) or
Connection
Description
Dimension/Diameter
Unit Size 130 or 180 Unit Size 260 or 310
Inches (mm)
A
—
8-1/4 (210) 8-1/4 (210)
B 3-1/4 (83) 3-1/4 (83)
C 8-5/16 (211) 9-3/32 (231)
D 4-5/16 (110) 5-1/16 (129)
Combustion air pipe Collar 6 (153) 6 (153)
Vent pipe PVC 4 (102) 4 (102)
Condensate drain PVC 1/2 (13) 1/2 (13)
• Pipe size requirements: size requirements are as follows:
• Vent piping: from heater to terminal end of vertical or horizontal vent (refer to Table 8)
• Combustion air piping: from heater to concentric adapter box and from concentric adapter box to outdoors
(refer to Table 9).
NOTE: The minimum/maximum requirements for the length of vent pipe that extends outdoors are different
for horizontal and vertical vent terminals (refer to Vent Terminal Options section).
Table 8. Vent Piping Size Requirements
Unit
Size
Diameter
(Inches (Millimeters))
Maximum Length
(Feet (Meters))
Equivalent Straight Length for Elbows
90-Degree Elbow*
45-Degree Elbow
130, 180, 260, 310 4 (102) 50 ( 15.2) 8 ( 2.4) 4 ( 1.2 )
*All 90-degree elbows in the vent system must be sweep type.
10
I-UEZ (04-21) 1034347-0
GENERAL INFORMATION—CONTINUED
Venting and Combustion Air Requirements—Continued
Vent/Combustion Air System Piping Requirements—Continued

Reznor UBX Specifications

General

Brand	Reznor
Model	UBX
Category	Gas Heater
Language	English