Warranty

8
whl-648 Rev. 000 Rel. 009 Date 1.4.19
H. Water Temperature Adjustment and Scalding
This boiler can deliver
scalding water. Be careful
whenever using hot
water to avoid scalding
injury. Certain boilers
such as dishwashers and
automatic clothes washers
may require increased
water temperatures. By
setting the thermostat
on this heater to obtain
the increased water
temperature required by
these boilers 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 3 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.
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 3 - Time and Temperature Relationship in Scalds
I. High Elevation Installations
Natural gas at high elevation might contain less heating value
than typical 1,000 BTU/cu ft and therefore can cause improper
air / gas mix leading to improper combustion. For natural gas
installations above 3,000 ft, call your gas provider to determine
the heating value of the supplied natural gas.
The boiler control is equipped with freeze protection that activates
based on internal water temperature. See the table below for details
on freeze protection operation.
NOTE: Freeze protection will not be active if the boiler loses power.
System
Freeze
Protection
(Activates
Based on
Internal
Water
Temperature)
Freeze Protection Operation Range
Stage 1 - If control detects water
temperature of 46
o
F (8
o
C) and below, it
turns the internal and external pumps
On for 600 seconds and O for 30
seconds. This cycle repeats until the
control detects inlet water temperature
of 50
o
F (10
o
C) and above.
ON or OFF
(Default: ON)
NOTE:
If using
boiler for
Snow Melt
applications,
turn Freeze
Protection
OFF.
Stage 2 - If control detects water
temperature of 41
o
F (5
o
C) and below,
it turns the burner on to meet a target
temperature of 104
o
F (40
o
C). The burner
and internal and external pumps will
continuously during this stage until the
control detects inlet water temperature
of 104
o
F (40
o
C) and above.
Stage 3 - If control detects water
temperature of 34
o
F (1
o
C) and below,
Er: 85 will appear on the display.
Table 2 - Freeze Protection Detail