Water Piping And Trim - New Yorker AP-490U Installation, Operating And Service Instructions

III: WATER PIPING AND TRIm
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. New Yorker's Standard 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 A PIPING SySTEM and install boiler which
will 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
should 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.
3. Connect System supply and return piping to boiler.
See Figures 6A and 6B. Also, consult I=B=R,
"Residential Hydronic Heating Installation and
Design Guide". Maintain minimum ½ inch
clearance from hot water piping to combustible
materials.
WARNING
System supply and return piping must be
connected to correct boiler pipe.
New Yorker recommends sizing the system
circulator to supply sufficient flow (GPM) to
allow a 20°F temperature differential in the
system. When sizing the system circulator,
the pressure drop of all radiators, baseboard
and radiant tubing and all connecting piping
must be considered.
10
WARNING
a. If this boiler is used in connection with
refrigeration systems, the boiler must be installed
so that the chilled medium is piped in parallel
with the heating boiler using appropriate valves
to prevent the chilled medium from entering the
boiler. See Figure 4. Also, consult I=B=R,
"Residential Hydronic Heating Installation and
Design Guide".
Figure 4: Recommended Piping for Combination
Heating and Cooling (Refrigeration) System
b. If this boiler is connected to heating coils located
in air handling units where they may be exposed
to refrigerated air, the boiler piping must be
equipped with flow control valves to prevent
gravity circulation of boiler water during the
operation of the cooling system.
c. If boiler is used with an Indirect-Fired Domestic
Water Heater, install the Indirect-Fired Domestic
Water Heater as a separate heating zone. Refer
to the Indirect-Fired Domestic Water Heater
Installation, Operating, and Service Instructions
for additional information.
d. Use a system bypass if the boiler is to be
operated in a system which has a large volume or
excessive radiation where low boiler water
temperatures may be encountered (i.e. converted
gravity circulation system, etc.) The bypass
should be the same size as the supply and return
lines with valves located in the bypass and return