Install Instructions

12
IV. BOILER WATER PIPING (continued)
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 ttings.
c. Oxygen permeable materials in the distribution
system.
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 ttings 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.
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 specically
identied 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-red
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 oor 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
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 oat type, due to their
relative costs and the simplicity of piping for a
probe LWCO.
Figure 7: Recommended Piping for Combination
Heating & Cooling (Refrigeration) Systems
Figure 8: Recommended Probe LWCO Location