Water Trim And Piping - Burnham 8HE Series Installation, Operating And Service Instructions

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Water Trim and Piping

• Failure to properly pipe boiler may result in improper operation and damage to boiler or structure.
• Oxygen contamination of boiler water will cause corrosion of iron and steel boiler components, and can lead to
boiler failure. Burnham Commercial's Warranty does not cover problems caused by oxygen contamination of boiler
water or scale (lime) build-up caused by frequent addition of water.
A. Design and install boiler and system piping to
prevent oxygen contamination of boiler water and
frequent water additions.
1. There are many possible causes of oxygen
contamination such as:
a. Addition of excessive make-up water as a
result of system leaks.
b. Absorption through open tanks and fittings.
c. Oxygen permeable materials in the
distribution system.
2. In order to insure long product life, oxygen
sources must be eliminated. This can
be accomplished by taking the following
measures:
a. Repairing system leaks to eliminate the
need for addition of make-up water.
b. Eliminating open tanks from the system.
c. Eliminating and/or repairing fittings which
allow oxygen absorption.
d. Use of non-permeable materials in the
distribution system.
e. Isolating the boiler from the system water by
installing a heat exchanger.
f. Use properly designed and operating air
elimination devices in water piping.
B. Design boiler piping and flow rate to obtain
proper temperature rise though the boiler. (See
Table 3-1)
C. Install Safety Relief Valve. See Figure 3-2.
Components are located in Water Trim Carton.
Safety Relief Valve must be installed with spindle
in vertical position.
1. Install ¾ in. NPT x 3½ in. lg. nipple in tapping
"C". See Figure 2-3.
2. Install safety relief valve on ¾ in. NPT nipple.
111828-01 - 1/23
8HE Installation, Operating & Service Instructions
!
WARNING
• Pipe discharge of relief valve to a location
where water or steam will not create a hazard
or cause property damage if the relief valve
opens.
• End of discharge pipe must terminate in an
unthreaded pipe.
• If relief valve discharge is not piped to a
drain, it must terminate at least 6 inches above
floor.
• Termination of the relief valve discharge
piping must be in an area where it is not likely
to become plugged by debris or subjected to
freezing.
• Do not install any valves between boiler and
relief valve.
• Do not install any valves between relief valve
and discharge.
• Do not move relief valve from factory location.
• Do not plug relief valve discharge.
• Do not install a relief valve with a setting
greater than 15 psi.
Table 3-1: Flow Rate, Temperature Rise, and
Pressure Drop
Boiler Flow Rate
Model (GPM)
20
805HE 13
10
25
806HE 17
13
!
WARNING
!
DANGER
Temp. Rise Min. Boiler
Thru Boiler Piping NPT
20° F 1½ in.
30° F 1¼ in.
40° F 1¼ in.
20° F 1½ in.
30° F 1½ in.
40° F 1¼ in.
Boiler
Pressure
Drop
3 ft.
2 ft.
1 ft.
3 ft.
2 ft.
1 ft.
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