Thermal Expansion; Fig. 17 - Exalt Combi - Hydro-Block Flow Diagram - IDEAL EXALT Solo 110 Installation & Maintenance Manual

CHAPTER 5 - EXALT COMBI UNITS - DOMESTIC PIPING
Pressure relief valve discharge piping must not be:
• Excessively long. Using more than 2 elbows or
15 feet of piping can reduce discharge capacity.
• Directly connected to a drain.
discharge piping within 6" from drain. Refer to
local codes.
• Plugged, reduced or restricted.
• Subject to freezing.
WARNING
Do not install any valve between
pressure relief valve and tank connection or
on pressure relief valve discharge piping. Do
not plug pressure relief valve or discharge
piping. Improper placement and piping of
T&P relief valve can cause severe personal
injury, death or substantial property damage.
1"
1" 3/4"
CH SUPPLY
28
Terminate
Stepper motor + cartridge
Plate-to-plate heat exchanger
DHW Temperature Sesnor
DHW SUPPLY

Fig. 17 - EXALT Combi - Hydro-block Flow Diagram

5.2.

Thermal Expansion

If a backflow preventer, check valve or pressure reducing
valve is piped on cold water supply piping of water
heater, install an expansion tank on cold water supply
line to prevent thermal expansion from repeatedly
forcing open pressure relief valve.
NOTICE
The pressure relief valve is not intended for
constant duty, such as relief of pressure due to
repeated normal thermal expansion. Correct
this condition by installing a properly sized
expansion tank in the domestic water system.
Refer to expansion tank manufacturer's
installation instructions for proper sizing.
Flow Sensor
DHW INLET
CH RETURN
to PUMP
1"
3/4" 1"
CH RETURN