Specifications

19
LP- 276 REV. 9.4.14
F. SCALDING
When raising tank temperature, you increase the risk of
scalding. Please use a water tempering or mixing valve and
extreme caution when raising tank temperature to lessen
the chance of scalds. Consult codes for conformance.
This water boiler can deliver scalding water at any faucet in
the system. 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 water boiler to obtain the increased water temperature required by these appliances, you
may create the potential for scald injury.
To protect against injury, the installer 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 6 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.
The table below represents the combined flow rates and pipe sizes when using multiple boilers to design the manifold system for the
primary circuit. To size, simply add up the number of boilers and the required flow rates for the system design temperature. Example:
(5) Mod Con 300 boilers with a design of 30
o
F temperature rise, with each boiler having an individual flow rate of 20 gpm. To correctly
size the manifold feeding these (5) Mod Con 300 boilers, you would need a pipe size of 3”.
Table 7 – Multiple Boiler Manifold Piping
The table below represents the various system design temperature rise through the Mod Con along with the respective flow and friction
loss which will aid in circulator selection.
APPROXIMATE TIME /
TEMPERATURE RELATIONSHIPS IN SCALDS
120
o
F
More than 5 minutes
125
o
F
1 ½ to 2 minutes
130
o
F
About 30 seconds
135
o
F
About 10 seconds
140
o
F
Less than 5 seconds
145
o
F
Less than 3 seconds
150
o
F
About 1 ½ seconds
155
o
F
About 1 second
Table 6