Water Piping And Trim - New Yorker PVCG-A Installation, Operating And Service Instructions

IV. 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 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.
Optional Probe LWCO Installation
WARNING
DO NOT ATTEMPT to cut factory wires to
install an aftermarket low Water Cut Off
(LWCO). Only use connections specifically
identified for Low Water Cut Off.
In all cases, follow the low Water Cut Off
(lWCO) manufacturer's instructions.
1. A low water cutoff is required to protect a gas-fired
hot water boiler when any connected heat distributor
(radiation) is installed below the top of the hot water
boiler (i.e. baseboard on the same floor level as
the boiler). In addition, some jurisdictions require
the use of a LWCO with a hot water boiler as a
redundant safety control.
It is recommended that the LWCO control is
installed above the boiler to provide the highest
level of protection. However, where the LWCO
WARNING
control is approved by the LWCO control
manufacturer for installation in a high boiler tapping
of a water boiler, the use of the listed LWCO control
is permitted when it is installed according to the
LWCO manufacturer's instructions.
2. The recommended location for a LWCO on gas
hot water boilers is above the boiler, in the supply
piping. The minimum safe water level of a water
boiler is at the uppermost top of the boiler; that is, it
must be full of water to operate safely.
3. Typically, in residential applications, a probe type
LWCO is used instead of a float type, due to their
relative costs and the simplicity of piping for a
probe LWCO.
4. Piping and fittings required to install LWCO are
field supplied.
5. When constructing a piping tree to install LWCO
select fittings (tees, elbows etc) and nipples to have
the same size (NPT) as boiler supply connection.
At minimum, 1-1/4" tee with ¾" branch outlet is
required to connect the probe LWCO to the supply
piping. See Figure 10. DO NOT REDUCE THE
SIZE OF NEAR BOILER SUPPLY FITTINGS
AND NIPPLES.
6. Installation of manual shutoff valve located above
the LWCO and the boiler is recommended to allow
servicing. Thus LWCO probe can be removed for
inspection without draining the heating system. An
annual inspection of the probe is recommended.
7. The presence of water covering properly installed
LWCO probe will cause the normally open contact
of the LWCO to close, thus providing continuity of
the 24 VAC service to the boiler gas valve. When
water level drops below probe, LWCO contact
opens up breaking 24V supply to gas valve and
preventing the boiler to fire.
8. 2012 compliant PVCG-A gas hot water boilers
have a "plug-in" provision in factory wiring that
will accept optional 24VAC probe LWCO harness
connector. The optional LWCO kit (P/N 104083-
01) includes 24VAC probe LWCO, Harness and
Instructions addressing piping, wiring and testing
after installation.
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