Rinnai Circ-Logic, Installation And Operation Manual, Page: 11 / 15

Rinnai Circ - Logic with Grundfos GTK03 Kit
11
Rinnai
Temperature
Setting (°F)
Typical Pump ON
Intervals* (minutes)
Economy Mode Comfort Mode
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
setting, insulation, and estimated heat loss in the
system. The values for your installation may vary.
Before operating the pump, the Rinnai Tankless
Water Heater should be turned on and the DIP
switches/parameters set correctly for recirculation
and Comfort or Economy Mode.
Pump recirculation begins when the water heater
is turned on. The Rinnai inlet and outlet
thermistors measure the water temperature. If the
inlet thermistor detects abnormal temperature,
then diagnostic 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 setting, the water heater and pump
will turn off.
The cycle will start at the approximate time
interval in the table based on the recirculation
mode setting. The cycle stops based on the
temperature thermistor readings.
When the pump is first started, the shaft may rotate slowly until water has fully penetrated the bearings.
If the pump does not run, the shaft can be rotated manually. To accomplish this, switch off the electrical
supply and close the isolation valves on each side of the pump. Remove the large screw in the middle of
the nameplate. Insert a small, flat blade screwdriver into the end of the shaft, and gently turn until the
shaft moves freely (Figure 4). Replace and tighten the plug. Open the isolation valves and wait 2 to 3
minutes for the system pressure to equalize before starting the pump (Figure 4).
Figure 4
NOTE
The isolation valves are to be field
supplied. The image to the right is for
illustration purposes only.