Reference dimensions are ± 10%
All dimensions are ± 1"
MM/DD/YY
MM/DD/YY
1/2"=1'
Custom
Dwg No.
Customer / Job name:
Scale:
Description:
Date:
Drawn/
Revised by:
Checked/
Apv. by:
Revision:
Description:
Date:
Drawn/
Revised by:
Checked/
Apv. by:
Revision:
(1)HWH 399 to 6x36 HSS
AJT
10/11/10
XX
To System
From
System
27
PART 5. PIPING
Basic piping connection steps are listed below. A drawing, specific to your application can be obtained from your
distributor or Hamilton Engineering, Inc., which will guide you through proper installation of the EVO.
1) Pipe properly, in accordance with generally accepted piping principals
or Hamilton Engineering specific documents.
2) Connect system return to the pipe entering the EVO
closest to the back.
3) Connect system supply to the pipe leaving the EVO
containing the Relief Valve.
4) Install Drain Valve on system supply.
NOTE:
The EVO cannot be drained of water without purging the unit with air
pressure, 15 PSI minimum. The system’s air vent must be closed during this
process.
(FIGURE 5-1) BOILER PIPING
(TABLE 5-1) BOILER PIPING
Model
BoilerOnly
GPM ∆P
Design ∆T
Pump
Supplied
Minimum Manifold Pipe Size
Single
Double
Triple
Quad
HW 299
11 @ 9.3'
51.8º F
28.8º C PMP 90304
1.5"
1.5"
2"
2"
HW 399
17.6 @ 8.5'
43.2º F 24.0º C PMP 90304
1.5"
2"
2"
2.5"
HW 599
26.4 @ 9.4'
45.3º F 25.2º C
PMP 90310
1.5"
2"
2.5"
3"
NOTE:
Flow rates shown above are for clean, closed loop systems.
PART 5. PIPING
A. HYDRONIC HEATING BOILER PIPING
The EVO is designed to function
in a closed loop (minimum) 12 PSI
System. Never let the EVO operate
without a minimum of 10 PSI water
pressure, this assures that the EVO
heat exchanger can be completely
purged of air, failure to do so could
cause damage. It is important to
note that the EVO Boiler is flow
dependent for proper efficiency
and life expectancy; therefore,
primary-secondary piping or use of
a low loss header design is always
recommended, as shown in the
Figure 5-1 below. Each EVO Heating
Boiler System should have an Air
Eliminator, in addition to the heat
exchanger mounted air vent, which
will remove air from the Hydronic
System. Always follow good piping
practices. Observe minimum 1"
clearance to combustibles around
all uninsulated hot water pipes, or
when openings around pipes are
not protected by non-combustible
materials. On an EVO installed
above the level of the highest heat
transfer device, some state and
local codes require a low water cut
off device at the time of installation
by the installer. A water flow switch
is provided as standard and will
take the place of a low water cut-
off. If the EVO supplies hot water
to heating coils in air handler units,
flow control valves or other devices
must be installed to prevent gravity
circulation of boiler water in the coils
during the cooling cycle.
