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Bobcat Models B-120A and B-200A
24
WATER PIPING
1. Connection of system to boiler:
P
rimary/secondary piping of the system is recommended, to
e
nsure the proper flow through the boiler. (See Figures 20
through 22). The boiler loop piping must be the same
diameter as the water outlet (supply) and inlet (return) piping
connections provided on the boiler, particularly on longer
loops. See page 2 for piping connection size.
2. Circulator Pumps:
The boiler loop piping must utilize the Taco 0011 circulator for
B
-120 and 0013 for B-200 that is supplied with the boiler, to
e
nsure the proper flow through the boiler. Refer to Figure 19
for the boiler water side pressure drop and Table 2a and 2b
for the recommended pump models for the domestic hot
water system. Install the pumps in the orientation shown in
Figures 20 through 22.
3. Relief Valve(supplied with boiler):
Tee the relief valve into the boiler water outlet (supply) piping
as close to the water outlet (supply) connection as possible.
(See Figure 18). The relief valve’s discharge piping must be
the same size or larger than the relief valve’s outlet, and must
terminate 6” minimum from floor with a plain (no threads) end.
Place a bucket under pressure relief valve discharge. Make
sure discharge is always visible. DO NOT hard-pipe to drain
piping, or any place where freezing could occur. No shut-off
valve is permitted between the relief valve and boiler, or in the
discharge line.
4. Air Control System:
An appropriately sized diaphragm-type expansion tank must
be used to control the system pressure. See boiler volume
data on page 2, and the recommended location in Figures 20
through 22. An air vent is recommended to be installed on an
air separator in close proximity to the expansion tank.
5. Cold Water Fill:
A pressure reducing (fill) valve, with a shut-off valve upstream
of it, should be installed in close proximity of the expansion
tank. (See Figures 20 through 22). Use a back flow check
valve in the cold water supply as required by local codes.
6. Lo
w Water Cutoff:
On a hot water boiler installed above radiation level, the boiler
must be provided with a low water cutoff device at the time of
installation by the installer (see Figure 18 for piping
arrangement).
7. Water Treatment and Freeze Protection:
A good water treatment program will not only extend the
useful life of this boiler but it will also save much of the time
a
nd expense of repairs made necessary by preventable
o
ccurrences. A reputable water treatment company should be
consulted to evaluate and determine the best overall
treatment program for your boiler equipment.
The heat exchanger is made of aluminum, so the system
water must be maintained between 7.0 and 8.5 PH level.
T
horoughly flush the system, before connecting the boiler, to
r
emove any sediment or glycol.
Anti-freeze is sometimes used in hydronic systems to
protect against freez-up in the event of power failure or
boiler shut down in the cold winter.
Use RhoGard
(Propyleneglycol with Pro-Tek 922 inhibitor) by Rhomar
Water Management, Inc.
Follow the manufacturer’s
instructions for proper application and proper mixture for
minim
um ambient temperature.
An
y use of anti-freeze
other than that supplied by Slant-Fin or specifically
approved and/or recommended for use by Slant-Fin
will void this warranty.
Never use Ethylene Glycol as it is toxic to humans.
Never use any types of automotive or standard gylcol freeze
protection fluids.
8. Piping a heating - cooling system to a water boiler and
chiller:
Figure 22 illustrates a method of piping a heating-cooling
system to a water boiler and a chiller. Hand valves (shown)
or automatic valves must be installed to prevent circulation
of chilled water in the boiler or hot water in the chiller.
The air control system and pressure control system must
operate with chiller only, or the boiler only, being valved to
the piping system. Separate control devices on the boiler
and chiller may be used, or a single set of air and pres-
sure controls on the common piping may be preferred.
If the boiler is used to supply hot water to heating coils in
air handling units, flow control valves or other devices
must be installed to prevent gravity circulation of water in
the coils during the cooling cycle.