Advertisement
IV Installation/Piping
IV Installation/Piping
IV Installation/Piping
(cont'd)
(cont'd)
(cont'd)
E
E
E
G
G
G
F
F
F
D
D
D
Domes�c Water:
Domes�c Water:
Domes�c Water:
A. Install isola�on valve between the water supply and
A. Install isola�on valve between the water supply and
A. Install isola�on valve between the water supply and
the cold water inlet of the tank for ease of service.
the cold water inlet of the tank for ease of service.
the cold water inlet of the tank for ease of service.
B. Installing a heat trap in the domes�c hot water outlet
B. Installing a heat trap in the domes�c hot water outlet
B. Installing a heat trap in the domes�c hot water outlet
piping will improve energy efficiency and reduce pip‐
piping will improve energy efficiency and reduce pip‐
piping will improve energy efficiency and reduce pip‐
ing heat loss.
ing heat loss.
ing heat loss.
C. A Thermosta�c Mixing Valve is recommended and
C. A Thermosta�c Mixing Valve is recommended and
C. A Thermosta�c Mixing Valve is recommended and
may be required by local codes. The valve will blend
may be required by local codes. The valve will blend
may be required by local codes. The valve will blend
the tank output water with cold water to achieve a
the tank output water with cold water to achieve a
the tank output water with cold water to achieve a
more constant mixed temperature. The risk of scald‐
more constant mixed temperature. The risk of scald‐
more constant mixed temperature. The risk of scald‐
ing is not eliminated by use of a mixing valve. Refer
ing is not eliminated by use of a mixing valve. Refer
ing is not eliminated by use of a mixing valve. Refer
to the installa�on instruc�ons provide by the mixing
to the installa�on instruc�ons provide by the mixing
to the installa�on instruc�ons provide by the mixing
valve manufacturer for proper installa�on.
valve manufacturer for proper installa�on.
valve manufacturer for proper installa�on.
D. Expansion Tank: When a back‐ow device or "no‐
D. Expansion Tank: When a back‐ow device or "no‐
D. Expansion Tank: When a back‐ow device or "no‐
return" valve is installed in the piping system a Ther‐
return" valve is installed in the piping system a Ther‐
return" valve is installed in the piping system a Ther‐
mal Expansion Tank designed for use in a domes�c
mal Expansion Tank designed for use in a domes�c
mal Expansion Tank designed for use in a domes�c
hot water system will be required. Install the tank in
hot water system will be required. Install the tank in
hot water system will be required. Install the tank in
the cold water piping close to the tank between the
the cold water piping close to the tank between the
the cold water piping close to the tank between the
tank and the back‐ow device. (see piping diagram)
tank and the back‐ow device. (see piping diagram)
tank and the back‐ow device. (see piping diagram)
Refer to Thermal Expansion Tank manufacturer's lit‐
Refer to Thermal Expansion Tank manufacturer's lit‐
Refer to Thermal Expansion Tank manufacturer's lit‐
erature for sizing and installa�on informa�on.
erature for sizing and installa�on informa�on.
erature for sizing and installa�on informa�on.
E. Vacuum Breaker: DHT recommends that a vacuum
E. Vacuum Breaker: DHT recommends that a vacuum
E. Vacuum Breaker: DHT recommends that a vacuum
breaker be installed on the domes�c piping to the
breaker be installed on the domes�c piping to the
breaker be installed on the domes�c piping to the
heater. The vacuum breaker protects the heater in
heater. The vacuum breaker protects the heater in
heater. The vacuum breaker protects the heater in
the event that the tank pressure falls below atmos‐
the event that the tank pressure falls below atmos‐
the event that the tank pressure falls below atmos‐
pheric pressure.
pheric pressure.
pheric pressure.
A
A
A
C
C
C
B
B
B
A Ball Valve—Typical
A Ball Valve—Typical
A Ball Valve—Typical
B Dielectric Union—Suggested
B Dielectric Union—Suggested
B Dielectric Union—Suggested
H
H
H
C Temperature & Pressure Relief Valve
C Temperature & Pressure Relief Valve
C Temperature & Pressure Relief Valve
D Heat Trap Loop—Suggested
D Heat Trap Loop—Suggested
D Heat Trap Loop—Suggested
E Thermosta�c Mixing Valve –Suggested
E Thermosta�c Mixing Valve –Suggested
E Thermosta�c Mixing Valve –Suggested
F High Temperature Outlet
F High Temperature Outlet
F High Temperature Outlet
G Mixed Temperature Outlet
G Mixed Temperature Outlet
G Mixed Temperature Outlet
H Expansion Tank in Cold Water Supply
H Expansion Tank in Cold Water Supply
H Expansion Tank in Cold Water Supply
Note: For drawing clarity, addi onal
Note: For drawing clarity, addi onal
Note: For drawing clarity, addi onal
isola on valves and other accessories have
isola on valves and other accessories have
isola on valves and other accessories have
been omi ed. Follow normal piping
been omi ed. Follow normal piping
been omi ed. Follow normal piping
prac ces when installing tank.
prac ces when installing tank.
prac ces when installing tank.
F. Temperature & Pressure Relief Valve: (T&P) Install a
F. Temperature & Pressure Relief Valve: (T&P) Install a
F. Temperature & Pressure Relief Valve: (T&P) Install a
T&P relief valve (long element type) into the separate
T&P relief valve (long element type) into the separate
T&P relief valve (long element type) into the separate
tapping designated for the T&P valve. Install temper‐
tapping designated for the T&P valve. Install temper‐
tapping designated for the T&P valve. Install temper‐
ature and pressure protec�ve equipment required by
ature and pressure protec�ve equipment required by
ature and pressure protec�ve equipment required by
local codes, but no less than a combina�on tempera‐
local codes, but no less than a combina�on tempera‐
local codes, but no less than a combina�on tempera‐
ture and pressure relief valve cer�ed as mee�ng the
ture and pressure relief valve cer�ed as mee�ng the
ture and pressure relief valve cer�ed as mee�ng the
requirements for relief Valve and Automa�c Shutoff
requirements for relief Valve and Automa�c Shutoff
requirements for relief Valve and Automa�c Shutoff
Devices for Hot Water systems, ANSI Z21.22, by a
Devices for Hot Water systems, ANSI Z21.22, by a
Devices for Hot Water systems, ANSI Z21.22, by a
na�onally recognized tes�ng laboratory that main‐
na�onally recognized tes�ng laboratory that main‐
na�onally recognized tes�ng laboratory that main‐
tains periodic inspec�on of listed equipment or mate‐
tains periodic inspec�on of listed equipment or mate‐
tains periodic inspec�on of listed equipment or mate‐
rials. The valve must be oriented, provided with tub‐
rials. The valve must be oriented, provided with tub‐
rials. The valve must be oriented, provided with tub‐
ing or otherwise installed so that discharge can exit
ing or otherwise installed so that discharge can exit
ing or otherwise installed so that discharge can exit
only within six (6) inches above, or at any distance
only within six (6) inches above, or at any distance
only within six (6) inches above, or at any distance
below, the structural oor, and cannot contact any
below, the structural oor, and cannot contact any
below, the structural oor, and cannot contact any
electrical part. The valve must be piped to an area
electrical part. The valve must be piped to an area
electrical part. The valve must be piped to an area
where discharge will not cause personal injury or
where discharge will not cause personal injury or
where discharge will not cause personal injury or
damage the surrounding area.
damage the surrounding area.
damage the surrounding area.
WARNING
WARNING
WARNING
Install a T&P relief valve with a rated capacity equal
Install a T&P relief valve with a rated capacity equal
Install a T&P relief valve with a rated capacity equal
or greater that the output of the energy source.
or greater that the output of the energy source.
or greater that the output of the energy source.
Removal of the T&P Valve or failure to replace the
Removal of the T&P Valve or failure to replace the
Removal of the T&P Valve or failure to replace the
valve will release the manufacturer from any claim
valve will release the manufacturer from any claim
valve will release the manufacturer from any claim
which might result from excessive
which might result from excessive
which might result from excessive
temperatures and pressures
temperatures and pressures
temperatures and pressures
10
10
10
Legend
Legend
Legend
Advertisement
