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IMPORTANT
This section is referring to domestic hot water recirculation in the plumbing system and not the circulation
of hot water between the air handler and tankless water heater/boiler.
Domestic hot water recirculation circulates hot water through the plumbing system so that instant hot water is
available. Domestic hot water recirculation operates between calls for heat to ensure a balance of comfort for
HVAC heating and domestic hot water. If pairing a Rinnai Hydronic Air Handler with a tankless water heater for
domestic hot water recirculation capabilities, Rinnai recommends the following:
•
Use an external recirculation pump controlled by a timer, aquastat, and/or an on-demand type control.
Do not use a Rinnai Tankless Water Heater equipped with recirculation capability
Hydronic Air Handler.
•
Size the air handler based off of the maximum allowable temperature for the domestic hot water system.
Refer to section "5.7.3 Domestic Hot Water Recirculation Piping Diagrams" for domestic hot water recirculation
piping diagrams.
For more information on domestic hot water recirculation, refer to the tankless water heater installation and
operation manual.
1
Rinnai Tankless Water Heaters equipped with recirculation capability include the SE+ Series featuring ThermaCirc360™
models (Super High-Efficiency Plus RUR Models).
3-Speed PSC Motor Speed Table
Air Handler
Speed
Models
AH083P
Low
AH083CP
2
Med
High
AH084P
Low
AH084CP
2
Med
High
AH125P
Low
AH125CP
2
Med
High
AH166P
Low
AH166CP
Med
2
High
AH206P
Low
AH206CP
Med
2
High
2
Factory default setting for both heating and cooling.
•
Results are obtained while air handler is operating with a dry DX coil and air filter installed.
•
Values are nominal and blower performance can vary higher or lower from these values based on the
evaporator coil that is used. Hot water heat air flow performance data includes associated air pressure
drop across a four-row hot water coil for models AH084P/CP, AH125P/CP, and AH166P/CP, and air
pressure drop across a three-row hot water coil for models AH083P/CP and AH206P/CP.
12
Air Flow (CFM) vs External Static Pressure (WC)
0.1
0.2
749
705
865
815
904
836
749
705
865
815
904
836
1198
1144
1257
1198
1273
1215
1576
1514
1643
1576
1707
1606
1759
1691
1838
1788
1928
1867
Hydronic Air Handler Installation and Operation Manual
0.3
0.4
658
614
760
708
801
740
658
614
760
708
801
740
1086
1018
1130
1072
1158
1094
1433
1338
1490
1407
1545
1441
1652
1580
1729
1644
1810
1729
1
with the Rinnai
0.5
558
646
681
558
646
681
962
1010
1018
1264
1320
1364
1512
1555
1637
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