Install Instructions

21
The following guidelines should be followed when
piping the tankless heater:
1. Flow Regulation — If ow through the heater is
greater than its rating, the supply of adequate hot
water may not be able to keep up with the demand.
For this reason a ow regulator matching the heater
rating should be installed in the cold water line to
the heater. The ow regulator should preferably be
located below the inlet to the heater and a minimum
of 3’ away from the inlet so that the regulator is not
subjected to excess temperatures that may occur
during “off” periods when it is possible for heat
to be conducted back through the supply line. The
ow regulator also limits the ow of supply water
regardless of inlet pressure variations in the range of
20 to 125 psi.
2. Tempering Hot Water — Installation of an
automatic mixing valve will lengthen the delivery of
the available hot water by mixing some cold water
with the hot. This prevents excessive and possibly
scalding hot water at the xtures. In addition,
savings of hot water will be achieved since the user
will not waste as much hot water while seeking
water temperature to his liking. Higher temperature
hot water required by dishwashers and automatic
washers is possible by piping the hot water from
the heater prior to entering the mixing valve. The
mixing valve should be “trapped” by installing it
below the cold water inlet to heater to prevent lime
formation in the valve.
WARNING
Install automatic mixing valve at tankless heater
outlet to avoid risk of burns or scalding due to
excessively hot water at xtures. Adjust and
maintain the mixing valve in accordance with the
manufacturer's instructions.
3. Flushing of Heater — All water contains some
sediment which settles on the inside of the coil.
Consequently, the heater should be periodically
backwashed. This is accomplished by installing
hose bibs as illustrated and allowing water at city
pressure to run into hose bib A, through the heater,
and out hose bib B until the discharge is clear. The
tees in which the hose bibs are located should be
the same size as heater connections to minimize
pressure drop.
4. Hard Water — A water analysis is necessary to
determine the hardness of your potable water. This
is applicable to some city water and particularly to
well water. An appropriate water softener should
be installed based on the analysis and dealer’s
recommendation. This is not only benecial to the
III: INSTALLATION INSTRUCTIONS (continued)
tankless heater but to piping and xtures plus the
many other benets derived from soft water.
K. INDIRECT WATER HEATER PIPING
1. Connect Indirect Water Heater Piping as
shown in Figures 12A and 12B for water boilers
and Figures 13 and 16 for steam boilers. Refer
to Indirect Water Heater Instruction Manual for
additional installation information.
a. CL Series Water Boiler - Figures 12A and 12B
show indirect water heater piping on typical hot
water heating system. Boiler piping is the same
as for any two-zone system. Figures 12A and
12B show circulator zoning, which is usually
preferred for indirect water heaters. Size the
circulator and indirect water heater piping to
obtain the boiler water ow through the indirect
water heater called for by the indirect water
heater manufacturer. Refer to the indirect water
heater instruction manual for additional details.
b. CL Series Steam Boiler - All CL Series steam
boilers are equipped with tappings to permit the
connect of an indirect water heater, see Figures
2B and 16. In this type of system, hot boiler
water is drawn from below the water line and
passed through the heat exchanger in the indirect
water heater.
This section describes boiler-side piping only.
Refer to the indirect water heater instruction
manual for additional details.
L. CHIMNEY VENTING
1. Chimney venting is an important part of a safe
and efcient oil red appliance system. Contact
your local re and building ofcials on specic
requirements for restrictions and the installation
of fuel oil burning equipment. In addition,
consult with a professional knowledgeable on
the requirements of NFPA 31 – Standard for the
Installation of Oil-Burning Equipment and NFPA
211 - Standard for Chimneys, Fireplaces, Vents, and
Solid Fuel-Burning Appliances for installations in
the United States. Installations in Canada must be
reviewed with a professional knowledgeable on the
requirements of CSA B139 – Installation Code for
Oil-burning Equipment.
2. The safe venting of oil red boilers is dependant
on many factors. Some of these factors include:
a. sufcient draft during the entire heating season
to allow for the safe discharge of combustion by-
products and;
b. suitable corrosion protection in the event of
condensing ue gases. Only a trained and
qualied contractor may install this product.