Rinnai RU80i Installation And Operation Manual page 30

Recircula on Mode
Sequence of Opera on
DIP switches (SW2 ‐ white switches, #4, #8) should be
set correctly for recircula on and mode. The Rinnai
water heater should be turned on.
Pump recircula on begins when the water heater is
turned on. The Rinnai inlet and outlet thermistors
measure the water temperature.
The water heater produces hot water at the
temperature se ng. If the inlet thermistor detects
abnormal temperature then diagnos c code 51 is
generated and the pump will turn off.
When the return water temperature reaches
approximately 15°F (8.3°C) below the temperature
se ng, the water heater and pump will turn off.
The cycle will restart at the approximate me interval
in the table based on the temperature thermistor
readings.
Economy Mode
The Economy mode operates as follows:
•
Less energy consumed due to fewer pump cycles
•
Assumes plumbing is insulated (minimal pipe heat
loss)
•
Pump cycles on every 31 to 79 minutes (see
table).
Comfort Mode
The Comfort mode operates as follows:
•
Higher energy consump on due to more pump
cycles
•
Assumes plumbing is not insulated resul ng in
higher pipe heat loss
•
Pump cycles on every 15 to 39 minutes (see
table).
30 KB Series Manual
Typical Pump ON Intervals*
Rinnai
Temperature
Se ng
°F
140
135
130
125
120
115
110
108
106
104
102
100
98
* The pump will cycle on at these calculated
intervals which are based on the temperature
se ng, insula on, and es mated heat loss in the
system. The values for your installa on may vary.
(minutes)
Economy Comfort
Mode Mode
31 15
31 15
31 15
31 15
31 15
35 18
42 21
45 22
49 24
54 27
60 30
68 34
79 39