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AQUA PLUS indirect-fired water heaters — Product Manual
Domestic water piping
(continued)
LEGEND for Figure 2, page 6
Domestic water supplied to fixtures that could pose
an injury hazard due to high temperature, such as
showers and faucets, should be equipped with a
temperature regulating device, such as an anti-scald
mixing valve
.
When the supply pressure is higher than 70 PSIG,
install a
pressure reducing valve on cold water
supply line to prevent water loss through T&P relief
valve. A thermal expansion tank is also required.
This symbol, where used in this manual, indicates the
item is required by Massachusetts code.
This symbol indicates the item is optional, unless
required by applicable codes.
1
Domestic cold water inlet connection — see Fig-
ure3,page6 for size
2 Domestic hot water outlet connection — see Fig-
ure3,page6 for size
3 Domestic recirculation connection — see Fig-
ure3,page6 for size
4 Boiler water inlet to coil — see Figure3,page6 for size
5 Boiler water outlet from coil — see Figure3,page6 for
size
6 Drain valve — provided by installer
• Install a drain valve on the DHW inlet to the water heater
as shown.
7
Piping from drain valve
• Pipe from drain to floor drain, if available.
8
T&P valve connection
9 T&P relief valve — supplied with water heater
• Use only the T&P valve supplied with the water heater.
See Replacement parts for part number.
• Install the T&P relief valve in the top center tapping, as
shown.
10
T&P relief valve discharge piping —
• must be made of material serviceable for temperatures
of 250°F or greater.
• must be directed so that hot water flows away from all
persons.
• must be directed to a suitable place for disposal.
• must be installed so as to allow complete draining of the
T&P relief valve and discharge line.
• must NOT be excessively long — using more than 2 el-
bows or 15 feet of piping can reduce discharge capacity.
• must NOT be directly connected to a drain — terminate
discharge piping within 6” from floor — refer to local
codes.
• must NOT be plugged, reduced or restricted.
• must NOT be subjected to freezing.
Do not install any valve between T&P relief valve and
tank connection, or on T&P relief valve discharge
piping. Do not plug T&P relief valve or its discharge
piping. Improper placement and piping of T&P re-
lief valve can cause severe personal injury, death or
substantial property damage.
11
Temperature adjustment knob
12Anode access
• The anode is specially made for this water heater. Use
only the anode available from Weil-McLain, as listed in
Replacement parts.
13
Mixing valve — — RECOMMENDED
• See Replacement parts for thermostatic mixing valves
available from Weil-McLain.
14
Domestic cold water supply
When the water supply pressure is higher than
70 PSIG, install a pressure-reducing valve on the
cold water supply line to prevent leakage from the
T & P relief valve. A thermal expansion tank is also
required.
15
Domestic mixed-temperature water supply to
system
(when used — requires mixing valve)
16Domestic high-temperature hot water supply to
system
17Heat trap loops (12” minimum) —
18Isolation valves
19Thermal expansion tank —
• REQUIRED if cold water line is equipped with a backflow
preventer or pressure reducing valve — see EXPANSION
TANK WARNING
on page 6.
20
Shock arrester —
Dishwashers, clothes washers, and fast-closing positive
shutoff valves incorporated in the system all contrib-
ute to creating water shock. Install a water hammer
arrester to prevent damage to pipes and appliances.
See control manufacturer’s instructions for applica-
tion and installation.
21
Unions
• Use dielectric unions or couplings to protect hot and cold
water fittings from corrosion when connecting dissimilar
materials such as copper and galvanized iron pipe.
22
Backflow preventer — — — (required
for Commonwealth of Massachusetts)
23Vacuum breaker —
24Pressure reducing valve —
• REQUIRED when the supply pressure is higher than
70 PSIG — A thermal expansion tank is also required.
Part number GL-E223-ADOC 0311
7