5
A. Design and install system piping to prevent oxygen
contamination of appliance water and frequent water
additions.
1. There are many possible causes of oxygen contami-
nation 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 distribu-
tion system.
e. Use properly designed and operating air
elimination devices in water piping.
B. Connect system supply and return piping to appliance.
The supply piping should be connected to the front
connection of the coil to ensure proper venting. See
Figures 1, 3 and 4. Also consult I=B=R Installation and
PipingGuides.Maintainminimum½inchclearancefrom
hot water piping to combustible materials.
IV. Water Piping
C. Units must be assured an adequate supply of hot or
chilled water by proper sizing of the distribution
system, circulator and balancing provisions.
D. Supply and return piping may penetrate unit from the
bottom, rear or side (recessed units only). See Figure 2.
E. The heating units may be installed in a one-pipe system
with diverter fitting(s) for heating application only. The
location and quantity of diverter fitting(s) will affect the
flow to the unit. A single fitting located on the return
fromtheunitwillprovideminimalflow. Asinglefitting
located on the supply to the unit will provide increased
flow. Two fittings, one located on the supply and one
located on the return of the unit will provide the
maximumflowtotheunit. Consultthemanufacturer’s
instructions of the diverter fitting for additional informa-
tion. See Figure 3.
F. When the installation is to provide for heating and
cooling, it is highly recommended that a two pipe
reverse return distribution system be used. See Figure4.
It is also recommended that any piping carrying chilled
water be insulated and sealed with a suitable sealant as
necessary, to ensure condensation does not spill or
leak.
G. Before making connections to the units, the piping
should be flushed with water to remove dirt and
foreign matter from accumulating in the system.
ECITON
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