LAARS Mighty Max VW (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions - Manual (Page 8)

Page 8
LAARS Heating Systems
Figure 6. Installation of Tempering Valve.
Mixing Valve
Out -
Mixed Water
For Potable Use
Hot Water
From Water Heater
or Storage Tank
Cold Water
Supply
this is essentially correct for normal water. If a higher
temperature rise is measured, flow must be increased
by changing the piping or pump.
2.7.6 Combined Space Heating/Potable
Water Heating Systems
When using the Mighty Max VW heater as a
source of heat for a combined space heating/potable
water heating system, be sure to follow the
instructions of the space heating system.
Do not use water piping, fittings, valves, pumps,
and any other components which are not compatible
with potable water.
Do not connect the heater, which will be used to
supply potable water, to any heating system or
components previously used with a nonpotable water
heating system.
Do not add boiler treatment or any chemicals to
the heating system piping, since the piping contains
water for potable use.
Do not use solder containing lead in the potable
water lines.
If the space heating system requires water
temperatures greater than the water temperature for
potable hot water use, a tempering valve (see Figure 6)
Figure 5. Water Piping Diagram.
Hot Water
To Bldg.
Thermal
Expansion
Tank
Cold
Water
Hot Water
Return From
Bldg.
NOTE: Intermittent pump must be used with EM
2
and remote temperature control.
Conventional
Tank
To Drain
Service
Valve Pump
Mighty Max
VW Heater
To Drain
KEY
Valve
Check Valve
Gauge
or other means should be installed in the potable hot
water supply line to limit the risk of scald injury.
Some jurisdictions may require a backflow
preventer in the cold water line. In such cases, the
temperature and pressure relief valve may discharge
water due to expansion. An expansion tank approved
for potable water will eliminate this condition. Follow
the manufacturer's instructions for installation of the
expansion tank.
OUT OF
PRODUCTION