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7
System piping
System water piping methods
Observe a minimum of 1/4 inch clearance around all
un-insulated hot water pipes when openings around the pipes
are not protected by non-combustible materials.
General piping information
Basic steps are listed below along with illustrations on the
following pages (FIG. 7-3 thru 7-7), which will guide you
through the installation of the Armor water heater.
1. Connect the cold water supply to the inlet side of the water
heater.
2. Connect the hot water supply to the outlet side of the water
heater.
3.
Install a backflow preventer on the cold feed makeup water
line.
4. Install the factory supplied pump as shown in FIG. 7-3 thru
7-7.
5. Install an expansion tank on the system supply. Consult the
tank manufacturer's instruction for specific information
relating to tank installation. Size the expansion tank for the
required system volume and capacity.
6.
Install a drain valve at the lowest point of the system.
7. This appliance is supplied with a relief valve sized in
accordance with ASME Boiler and Pressure Vessel Code,
Section IV ("Heating Boilers"). Pipe the discharge of the
safety relief valve to a suitable drain to prevent injury in
the event of pressure relief. Pipe the discharge to a drain.
Provide piping that is the same size as the safety relief valve
outlet. Never block the outlet of the safety relief valve.
See the *piping illustrations included in this section, FIG. 7-3
thru 7-7 for suggested guidelines in piping the Armor water
heater.
*Please note that these illustrations are meant
NOTICE
to show system piping concept only, the
installer is responsible for all equipment and
detailing required by local codes.
Scalding
This water heater can deliver scalding temperature 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 temperature
water. By setting the thermostat on this water heater to obtain
the increased temperature water 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 the local plumbing supplier.
40
Installation & Operation Manual
Figure 7-1 Scald Warning Label Located on the Appliance
The following chart (Table 7A) 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.
Table 7A Approximate Time / Temperature Scald Chart
APPROXIMATE TIME / TEMPERATURE RELATIONSHIPS
IN SCALDS
120°F
125°F
130°F
135°F
140°F
145°F
150°F
155°F
Water chemistry
The temperature rises and circulating pumps
NOTICE
shown in Table 7B are selected based on the
heating of potable water with a specified
water chemistry. See Table 11A in Start-Up
Section for recommendations.
Heating of high hardness and/or high total dissolved solids
water may require a larger circulating pump, and a revised
temperature rise specification based on the water chemistry of
the water to be heated. See Table 11A in Start-Up Section for
recommendations.
Water with a hardness of less than 5 grains per gallon will
usually have a pH which can be aggressive and corrosive causing
non-warrantable damage to the pump, and associated piping.
Corrosion due to water chemistry generally shows up first in
the hot water system because heated water increases the rate of
corrosive chemical reactions.
More than 5 minutes
1 1/2 to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1 1/2 seconds
About 1 second
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