Bosch 940 ES Installation And Operating Instructions Manual page 30

Installation instructions
Fig. 26 Combustion air piping not shown for clarity purposes
[1] Good
[2] Better
[3] Best
[4] Enclosed vent pipe (Do not install damper)
[5] Unconditioned space (Do not install damper)
[6] Preferred damper position for vertical terminations
4.3.7 Venting for manufactured (mobile) homes
WARNING:
▶ In a manufactured (mobile) home installation, combustion
air shall not be supplied from occupied spaces.
When this appliance is installed in a mobile home, it is required
that the venting be installed such that all combustion air is
provided from outside the structure. As such, single pipe
venting installations are forbidden in mobile home
installations. Appropriate flue gas venting parts are listed in the
table 22:
30
3" Venting
24" Drain Tube Kit
3" x 45° Elbow
3" x 90° Elbow
3" x 6" Pipe
3" x 12" Pipe
3" x 18" Pipe
3" x 2' Pipe
3" x 3' Pipe
3" x 4' Pipe
Inline Vertical Tee
3" Roof Flashing 0/12-6/12
3" Roof Flashing 7/12-12/12
3" Rain Cap
3" Custom Wall Thimble
w/10" Sleeve (Qty 2)
3" Adjustable Adapter
3" Gear Clamps (Qty 2)
3" Storm Collar
Extreme Weather Termination* 2SVSHRC03
Horizontal Drain Tee
Table 22 Z-Flex Venting list
4.3.8 Fan speed adjustment
NOTICE:
IMPORTANT INFORMATION!
▶ Natural gas heaters with installation altitudes below 2,000
ft above sea level disregard this section.
Installation adjustment:
After installing the tankless water heater, the fan speed values
for minimum power (P2) and maximum power (P1) may need
adjustment due to variations in altitude and vent pipe length.
Failure to make necessary adjustments to fan speed values may
result in improper operation of the appliance.
First calculate the total equivalent vent length. This is the
straight pipe length of both exhaust and combustion air plus the
number of elbows used. To determine the length equivalency of
each elbow refer to table 9.
Use the equivalent vent length value to determine the
appropriate fan speed values found in table 23 and 24. Refer
to page 31 on how to adjust the fan speeds if an adjustment is
necessary. After changing fan speed values, proceed to
chapter 7.4 to confirm CO
940 ES – 6 720 644 930 (2019/09)
Z-flex Venting
2SVEDTK24
2SVEEWCF0345
2SVEEWCF0390
2SVEPWCF03.5
2SVEPWCF0301
2SVEPWCF0301.5
2SVEPWCF0302
2SVEPWCF0303
2SVEPWCF0304
2SVEVDP03
2SVSADJF03
2SVSADJSF03
2SVSRCF03
2SVSWTCEC03
2SVSTB03
4ZVAL03
7HS44XX
2SVSLSF03
2SVEDWCF03
values are within specified ranges.
2