Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 79
Figure 85
General Guidelines:
•
For the licensed installer / professional
•
For installation in commercial and residential domestic hot water applications only.
•
Rinnai strongly recommends installing insulation to the hot water and dedicated return lines to
decrease the amount of heat loss.
•
DO NOT install in combination with hydronic heating applications.
•
DO NOT electronically manifold (Cascade) more than three CXP units together.
•
DO NOT install the MC-195T-US Timer/Controller and Wi-Fi Module together as they are not
compatible accessories.
Two recirculation modes are available:
Dedicated mode (factory default) -
Home includes a dedicated circulation
return line in the plumbing system. The
water heater is shipped configured for
the Dedicated Recirculation Line mode.
Crossover mode - Home does not include a
dedicated circulation return line. Requires
installation of a thermal bypass valve
(included with purchase for CXP models) at
the farthest fixture in the plumbing system.
CROSSOVER MODE
DEDICATED MODE
Hot Water
Cold Water
Connection
Diagram:
Pressure
Relief Valve
Hot Water Drain Valve
Hot Water
Outlet
Figure 86
Condensate
Drain Trap Plug
Water
Drain Plug
Cold Water Inlet
With Filter
Gas Connection
Cold Water
Drain Valve
Condensate
Drain Line