LP-314 Rev. 012 Rel. 003 Date 9.27.19
12
Part 4 - Domestic Hot Water and Hydronic Piping
Failure to follow the instructions in this section WILL VOID the
warranty and may result in property damage, severe personal injury,
or death.
Dielectric unions or galvanized steel fittings must not be used in a
system with this appliance. Doing so WILL VOID the warranty. Use
only copper, brass, or stainless steel fittings. Teflon thread sealant
must be used on all connections.
DO NOT pipe the water heating side of this appliance with black iron,
galvanized steel, steel, or lead pipe. Doing so will result in premature
product failure and property damage, and WILL VOID the warranty.
A. Plumbing
Use two wrenches when tightening water piping at appliance. Use
one wrench to prevent the appliance return or supply line from
turning. Failure to prevent piping connections from turning could
cause damage to appliance components.
Domestic water connections must be installed in accordance with
all local and national plumbing codes or any applicable prevailing
standards. The appliance is supplied with a rated mixing valve certified
to ASSE 1017. You must completely follow the instructions included
with the mixing valve for proper installation. This mixing valve must be
installed on the domestic outlet to assure that hot water temperature
does not vary more than +/– 5°F, as the unit adjusts its stored water
automatic set point to meet the requirements of the hydronic heating
module. The valve MUST NOT be allowed to freeze. If the mixing valve
is installed in a potentially freezing situation, suitable insulation must
be fitted to prevent damage. DO NOT use excess thread sealant (in
liquid, tape or other form) as this may cause the mixing valve to fail.
Toxic chemicals shall not be introduced into the mixing valve system.
NOTE:
Recommend to the user that the mixing valve be checked
annually to ensure its continued function.
1. System Domestic Water Piping
The domestic inlet and outlet ports on the appliance are 1” NPT
connections. We recommend the installation of shut-off valves and
unions on both the inlet and outlet ports to isolate the appliance for
future service.
It is important that the connections on the inlet and outlet are brass or
copper. Never use dielectric unions or galvanized steel fittings. Teflon
thread sealant must be used to seal all tank connections. An approved
ASSE 1017 mixing valve is provided with every appliance and must be
installed on the outlet to protect the user from scalding temperatures.
This valve reduces the point of discharge temperature by mixing the
hot and cold water from the discharge outlet or mixed outlet port. This
device alone will not protect the user from scalding temperature. To
install and set up the mixing valve, follow the pre-installation steps in
this manual and also follow the enclosed instructions included with
the mixing valve.
2. Appliance Domestic Water Piping
B. Scalding
This appliance 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 temperatures. By setting the thermostat on this appliance to
obtain the increased water temperature required by these appliances
you may create the potential for scald injury.
To protect against injury, install the mixing valve included with this
ASSE 1017 or ASSE 1070 temperature limiting or mixing valves do
not eliminate the risk of scalding.
To avoid scalding:
•
Set the appliance set point temperature as low as possible.
•
Feel water before bathing or showering.
•
If thermostatic valves are required, use devices specifically
designed for such purpose. Install these devices in
accordance with instructions provided by the manufacturer.
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 3 - Approximate Time / Temperature Relationships in Scalds
appliance. This valve will reduce point of use discharge temperatures
by mixing cold and hot water in the branch supply lines.
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.
