ProSelect Force Hot Water Oil Boiler Installation Manual

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106346-06 - 8/19
FORCE
Installation, Operating & Service Manual
A. EVALUATE THE EXISTING WATER
SYSTEM.
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 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.
WARNING
System supply and return piping must be
connected to correct boiler manifolds.
U.S. Boiler Company, Inc. 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 most restrictive single zone should be used
to determine maximum pressure drop.
CAUTION
Maintain minimum ½ inch clearance from hot
water piping to combustible materials.
3. In order to insure long product life, operate boiler
at appropriate flow rate to minimize areas of
overheating
.
a. Design system to ensure that the flow is above
the limit called for in Table 4.
b. Maintain a constant boiler pressure of 12 PSI.
WARNING
Do not operate boiler below minimum volumetric
flow rates.
B. CONNECT SYSTEM SUPPLY AND RETURN
PIPING TO BOILER. See Figures 10A and
10B. Also, consult Residential Hydronic Heating
Installation and Design I=B=R Guide.
1. 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 11. Also, consult Residential Hydronic
Heating Installation and Design I=B=R Guide.
2. 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.
3. If an indirect water heater is used, priority zoning
can be used. Do not use priority zoning for Hydro-
Air Systems. Refer to the Indirect Water Heater
Installation, Operating, and Service Instructions
for additional information.
4. The FORCE OIL is designed to withstand thermal
shock from return water temperatures as low as
100°F, but prolonged return temperatures of below
135°F can cause excessive flue gas condensation
and damage the boiler and/or venting system.
Use a boiler 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 line
as illustrated in Figures 10A and 10B in order to
regulate water flow for maintenance of higher
boiler water temperature.
Boiler Model Flow Rate (Gal / Min)
FORCEOL084-E 4.5
FORCEOL115-E 4.5
FORCEOL140-E 8.0
FORCEOL182-E 10.0
Table 4: Minimum Flow Rate
4 Water Boiler Piping
NOTICE: Failure to pipe boiler as specified in this manual may result in excessive system noise.
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