19
LP- 325 REV. 3.3.15
C. BACKFLOW PREVENTER
Use a backflow preventer specifically designed for hydronic appliance installations. This valve should be installed on the cold water fill
supply line per local codes (see Piping Details).
D. SYSTEM WATER PIPING METHODS
EXPANSION TANK AND MAKE-UP WATER
1. Ensure that the expansion tank is sized to correctly handle appliance and system water volume and temperature. The appliance
volume is 55 gallons.
Undersized expansion tanks cause system water to be lost from the relief valve, causing make-up water to be added. Eventual
appliance failure can result due to excessive make-up water addition.
SUCH FAILURE IS NOT COVERED BY WARRANTY.
2. The expansion tank must be located as shown in the Appliance Piping Details, or following recognized design methods. See
expansion tank manufacturer’s instructions for details.
3. Connect the expansion tank on the suction side of the circulator. Always install the system fill connection at the same point as the
expansion tank connection to the system.
4. Most chilled water systems are piped using a closed type expansion tank.
E. CIRCULATOR PUMPS
DO NOT
install automatic air vents on closed type expansion tank systems. Air must remain in the system and return to the tank to
provide an air cushion. An automatic air vent would cause air to leave the system, resulting in improper operation of the expansion tank.
SIZING SPACE HEAT SYSTEM PIPING
1. See piping details in this manual. Special attention must be paid when connecting an indirect storage tank, as temperature delivered
to low temperature circuits may be higher than desired. The use of thermostatic mixing valves is required to protect these circuits.
To control the temperature of low temperature heating circuits when using an indirect fired water heater, a thermostatic mixing valve is
required. Failure to install a thermostatic mixing valve when using an indirect fired water heater could result in damage the heating
circuits. Such damage IS NOT covered by warranty.
2. Size the piping and components in the space heating system using recognized design methods.
F. DHW HEAT PACK AND INDIRECT WATER HEATER SCALDING
These appliances can deliver scalding water. Be careful whenever using hot water to avoid scalding injury. Certain appliances, such as
dishwashers and automatic clothes washers may require increased water temperature. By setting the thermostat on this appliance to
obtain the increased water temperature required by these appliances, you may create the potential for scald injury.
To protect against injury, you should install a mixing valve in the water system. This valve will reduce point of discharge temperature by
mixing cold and hot water in branch supply lines. Such valves are available from your local plumbing supplier.
Table 2 details the relationship of water temperature and time with regard to scald injury and may be used as a guide in determining the
safest water temperature for your applications.
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