Rinnai Circ-Logic Installation And Operation Manual page 6

WARNING
electrically grounded in accordance with local codes and ordinances or, in the absence of local
codes, in accordance with the National Electrical Code, ANSI/NFPA No. 70. Indoor water heaters are
equipped with a three-prong (grounding) plug for your protection against shock hazard and should be
plugged directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding
terminal from this plug. To protect yourself from harm, before installation:
•
Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at
the circuit breaker. (The temperature controller does not control the electrical power.)
•
Turn off the gas at the manual gas valve, usually located immediately below the water heater.
•
Turn off the incoming water supply. This can be done by turning off the water supply to the building.
1. Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at
the circuit breaker. Remove the front panel of the water heater by removing four screws.
2. Install the GTK03U pump according to the "Installation Guidelines for All Models" section and
system drawing in the Appendix.
3. Being careful not to damage existing wires, use a knockout or step drill bit to make a new hole to the
left of the existing hole on the bottom of the water heater that is 3/4 in. (19 mm) in diameter.
4. Remove the lock nut from the end of the flexible conduit to route the line through the new hole. After
the flexible conduit is installed through the bottom of the water heater, refasten the lock nut to
secure the line.
5. Connect the wires labelled "Wire to Tankless" to the external pump harness (not included). Connect
the blue to white wires and red to black wires, using one wire nut for each connection.
6. After the wires are securely fastened, connect the pump harness cable to the PC Board as
illustrated below.
7. Adjust the parameter settings in the water heater for recirculation by following the information in the
next section.
External
Pump Harness
Rinnai Circ-Logic with Grundfos GTK03 Kit
Install the Rinnai Tankless Water Heater according to the Rinnai Tankless
Water Heater Installation and Operation Manual. The water heater must be
GTK03U
PUMP
6