WHL-053 Rev. 00 Rel. 003 Date 7.21.17
18
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 7 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 7 - Approximate Time / Temperature Relationships in Scalds
H. High Velocity Circulator Pump
Minimum Boiler Flow Rates
VWH Model
Minimum Flow (GPM)
220
14.6
299 / 301
20
399
26
Table 8 - 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
flow rates are listed in the table below.
Summary of Contents for 220VWH
Page 36: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 36 Figure 25 Internal Connection Diagram...
Page 57: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 57 Figure 29 Condensate Detail...
Page 60: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 60 Figure 32 Replacement Parts All Models...
Page 66: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 66 Maintenance Notes...
