KBD Series Manual 53
SW4 and SW8 in DIPSW 2 should be set correctly for
recirculaon and mode. The Rinnai water heater
should be turned on.
Pump recirculaon 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 seng. If the inlet thermistor detects
abnormal temperature then diagnosc code 51 is
generated and the pump will turn o.
When the return water temperature reaches
approximately 15°F (8.3°C) below the temperature
seng, the water heater and pump will turn o.
The cycle will restart at the approximate me interval
in the table based on the temperature thermistor
readings.
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).
The Comfort mode operates as follows:
Higher energy consumpon due to more pump
cycles
Assumes plumbing is not insulated resulng in
higher pipe heat loss
Pump cycles on every 15 to 39 minutes (see
table).
140 31 15
135 31 15
130 31 15
125 31 15
120 31 15
115 35 18
110 42 21
108 45 22
106 49 24
104 54 27
102 60 30
100 68 34
98 79 39
* The pump will cycle on at these calculated
intervals which are based on the temperature
seng, insulaon, and esmated heat loss in the
system. The values for your installaon may vary.
The oponal MC195T-US controller provides a mer
funcon to control the on/o periods of the recircula-
on pump.
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