LP-551 Rev. 3.9.16
16
G. Scalding
This 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
temperatures. By
setting the thermostat
on this boiler to obtain
the increased water
temperature required
by these appliances you
may create the potential
for scald injury.
To protect against injury, install a mixing valve in the
water system. This valve will reduce point of use discharge
temperatures by mixing cold and hot water in branch supply
lines. Such valves are available from your local plumbing
supplier.
Table 5 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 risk of scalding increases when raising tank temperature.
Use a water tempering or mixing valve when raising tank
temperature to lessen the chance of scalds. Consult codes for
conformance. Failure to install a temperature limiting or mixing
valve and follow these instructions could result in property
damage, severe personal injury, or death due to scalds.
Approximate Time / Temperature Relationships in Scalds
120
o
F More than 5 minutes
125
o
F 1 1/2 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 1/2 seconds
155
o
F About 1 second
Table 5 - Approximate Time / Temperature Relationships in Scalds
H. High Velocity Circulator Pump
7. Connect red wire from ow switch to boiler wire harness.
8. When installation is complete, power up the boiler and
program set point. *Please note that these illustrations are
meant only to demonstrate installation. The installer is
responsible for all equipment and detailing required by local
codes.
Minimum Boiler Flow Rates
VWH Model Minimum Flow (GPM)
220 14.6
299 / 301 20
399 26
Table 6 - Minimum Flow Rates
Every VWH system requires special attention to pump size in
order to overcome pressure drop through the boiler and its
related piping. All circulators installed on the VWH system
must be designed for a potable water system.
In addition, the heat exchanger has a minimum total water
volume that must be taken into account when sizing the
circulator. Minimum ow rates are listed in the table below.
VWH Circulators and Flanges
VWH
Model
Circulator
Circulator
Part #
Flange Size
Flange
Part #
220 0013-SF3 7450P-241 1” NPT 7450P-242
299 / 301 2400-20S 7250P-605 1 1/4” NPT 7250P-603
399 2400-50S 7250P-606 1 1/2” NPT 7250P-604
Table 7 - VWH Circulators and Flanges
VWH Circulator Kits
• 220 Model - Part # 7450P-248
• 299 / 301 Models - Part # 7450P-249
• 399 Model - Part # 7450P-250
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