Instructions / Assembly

9
WHL-590 REV. 7.27.16
The water heater 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 water heater loses power.
System Freeze Protection
(Activates Based on Internal Water
Temperature)
Freeze Protection Operation
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 600s and Off for 30s. This cycle repeats until the control detects return water temperature of 50
o
F (10
o
C)
and above.
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 run continuously during this stage
until the control detects return 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 3 – Freeze Protection Detail
G. SCALDING
This heater 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 heater 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 4 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.
H. 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.
Table 4 – Time and Temperature Relationship in Scalds
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