Rinnai SENSEI RSC160i Installation And Operation Manual page 49

3. Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)
Common venting allows multiple Rinnai Tankless Water
Heaters to share the same vent system. When operating
multiple water heaters in a common venting system, it
is recommended to use Rinnai's EZConnect™ cable
(purchased separately) which electronically connects two
water heaters so they function as one hot water source.
Do not common vent this water heater with any other water
heater or appliance.
Note: Multiple RSC models (water heaters with a
recirculation pump) cannot be electronically connected
using the EZConnect™ cable. The EZConnect™ cable
connects only an RSC model with an RU model. See
illustration below.
CORRECT
RSC199
(With Pump)
Primary
Figure 50
Common Vent Maximum Equivalent Vent Lengths
Common vent equivalent lengths include polypropylene
pipe (PP) or PVC in a back-to-back or inline
configuration.
For the table below:
• Header is the main vent pipe into which sev-
eral vents connect.
• Vent Length is the distance from the end of
the header to the vent termination.
• Maximum vent length starts at the end
of the header system.
Table 22: Common Vent Maximum Vent Length
Water Heater Model
RSC199i: REU-NP3237FF-US(A)
and RU199i: REU-N3237FF-US
RSC160i: REU-NP2530FF-US(A)
and RU160i: REU-N2530FF-US
Rinnai Tankless Water Heater Installation and Operation Manual
RU199
(Without Pump)
Secondary
Figure 52
# Water
Max System Btu/hr
Heaters
2
2
Figure 49: Sample Inline, Freestanding
Configuration
NOT CORRECT
RSC199
(With Pump)
Figure 51
Header
3 in.
65 ft
398,000
(20 m)
90 ft
320,000
(27 m)
RSC199
(With Pump)
Vent Length
Vent Diameter
4 in. 6 in.
150 ft 150 ft
(46 m) (46 m)
150 ft 150 ft
(46 m) (46 m)
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