Laars Mighty Max VW Series, Installation, Operation And Maintenance Instructions

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Page 8
LAARS HEATING SYSTEMS
maximum working pressure shown on the rating plate
of the water heater, or the maximum working pressure
of the separate storage vessel, whichever is the lower
pressure. The temperature and pressure relief valve
must have a maximum working temperature not to
exceed 210°F (99°C).
Do not place any shutoff valves between the
temperature and pressure relief valve and the storage
vessel.
The relief valves discharge water in large
quantities should circumstances demand.
The discharge pipe:
1. Must not be connected directly to a drain. The
Discharge pipe must terminate 6 inches (152mm)
above a floor drain or external to the building. If
the discharge pipe is not directed to a drain or
other suitable means, the water flow may cause
property damage.
2. Must not be smaller than the pipe size of the
relief valve.
3. Must be of material capable of withstanding
210°F (99°C) without distortion.
4. Must be installed to allow complete drainage of
both the relief valve and discharge pipe.
5. Must not have any valve between the relief valve
and the end of the discharge pipe.
Do not thread, cap, plug, or block the end of the
discharge pipe. Do not install a reducing coupling or
other restrictions in the discharge pipe.
WARNING
Hot water can scald! Hot water can produce third
degree burns in 6 seconds at 140°F (60°C) and in
30 seconds at 130°F (54°C).
Manually operate the relief valves at least once a
year. To prevent water damage, discharge pipe must
terminate at an adequate drain. Standing clear of the
outlet (discharge water may be hot), lift and release
the lever handle on the relief valve to make the valve
operate freely.
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