Rinnai Circ-Logic RL94i - User Manual

100000284 Rev D 1 Rinnai Circ-Logic™ with Grundfos Kit
Descripon
Rinnai Circ-Logic™ oers homeowners
enhanced convenience and energy
eciency in home hot water recirculaon
systems with a dedicated return line. Circ-
Logic™ controls the on/o sequence and
operaonal cycles of the recirculaon pump
through the programming of the tankless
water heater's control board. This feature is
standard on Rinnai's Ultra and Luxury Series
units.
Circ-Logic™ has been designed to provide
homeowners with the ability to customize
their recirculaon systems based on such
key variables as length of recirculaon loop,
piping insulaon, and the homeowner's
comfort and eciency preferences.
The GTK15 kit, manufactured by Grundfos,
allows the user to enjoy further energy
savings through the use of a mer.
For specic informaon on warranty with
circulaon, please visit
hp://www.rinnai.us/warranty
Rinnai Circ-Logic™
With Grundfos GTK15 Kit

Rinnai Circ-Logic RL94i Specifications

General

Category	Tankless Water Heater
Model Number	RL94i
Gas Connection Size	3/4" NPT
Water Connection Size	3/4" NPT
Circ-Logic	Yes
Heat Exchanger Material	Copper
Fuel Type	Natural Gas
Maximum BTU Input	199, 000 BTU
Minimum BTU Input	15, 000 BTU
Temperature Range with MCC-91 controller	98°F - 185°F
Energy Efficiency	High Efficiency
Electrical Requirements	120V
Warranty	12 years on heat exchanger, 5 years on parts, 1 year on labor

Summary

Description

Benefits of Circ-Logic

Energy Efficiency

Enables homeowner to use Economy Mode and cycle pump less often for reduced energy use.

Greater Comfort

Can be used to re-heat circulation loop more frequently, ensuring high temperature.

Improved Durability

Reduces overall cycle frequency, limiting wear on tankless unit workings.

Rinnai Water Heaters that Incorporate Circ-Logic

Kit Contents

Disclaimers

Rinnai Circ-Logic Description

Economy Mode

Uses longer time intervals for reduced energy consumption or to maintain temperature in well-insulated loops.

Comfort Mode

Uses shorter time intervals to keep loop hot or cope with high heat loss.

Pipe Length

System Drawings

Rinnai Equipment List

Pump Installation

Recommended Terminal Box Orientation

Proper installation of the pump will have the terminal box located to one side, with conduit entry down.

Wiring the Pump to the Water Heater

Settings for SW2 (bank of white switches)

Configuration for Economy and Comfort modes via dip switches SW2-4 and SW2-8.

Timer Technical Data

Timer Technical Application

Timer Operation

Troubleshooting

Sequence of Operation

Sequence of Operations Flowchart

Flowchart illustrating the sequence of operations based on timer and Circ-Logic™ settings.