Water Piping - Slant/Fin B-120A Installation And Operating Instructions Manual

24

WATER PIPING

1. Connection of system to boiler:
Primary/secondary piping of the system is mandatory, to
ensure 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 ensure 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 152mm (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. Low 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).
Bobcat Models B-120A and B-200A
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 and expense of repairs made necessary by
preventable occurrences. 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.
Thoroughly flush the system, before connecting the boiler,
to remove any sediment or glycol.
Anti-freeze is sometimes used in hydronic systems to
protect against freeze-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 minimum ambient temperature. Any
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.