Installation / Operation Instruction Manual

Internet Version for Reference Only
INSTALLATION INSTRUCTION - SUPPLEMENT SHEET
HYDRONIC HEATING WITH COMBI2
POTABLE AND SPACE HEATING CONNECTIONS
The heat exchanger interior has been designed for non-potable water, such as in a hydronic heating
system. If replacing an existing water heating appliance, be sure to turn off electrical power, heating fluid
and / or gas supply to the existing appliance.
The return and supply heating system connections are identified on the side of the appliance. The use of
shut off valves and unions are recommended for future service convenience. A suitable expansion tank
must be installed in the space heating circuit. Consult local codes for proper use, sizing and installation of
an expansion tank. DO NOT operate this water heater in a closed system without provisions for
controlling thermal expansion.
Due to the elevated operating temperature needed to supply adequate hot water for space heating, an
ASSE approved thermostatic mixing valve has been provided and must be installed in the potable water
piping as shown in Figure 1. Directions for proper installation and adjustment are provided with the
integrated mixing system.
Notice: Failure to properly install and regulate the provided ASSE approved thermostatic mixing valve
may increase the danger of scald injury and nullify the warranty.
DANGER
Hotter water increases the risk of scald injury. Scalding may occur within 5 seconds at a setting of
140°F (60°C). Water temperature over 125°F (52°C) can cause severe burns or death from scalds.
Children, disabled and the elderly are at the highest risk of being scalded. Please feel the water before
bathing or showering.
Figure 1 – Integrated Mixing Valve application for Tempered Water
SYSTEM LAYOUT FOR COMBI2 WATER HEATING SYSTEM (See Figures 2 and 3)
238-46299-00A REV 08/06