Keystone Boilers and Water Heaters
Page 19
7 and for the piping it will serve, and should be supplied
to job separately. Triangle Tube strongly recommends
primary-secondary piping.
6A.2 KS Cold Water Make-Up
1. Connect the cold water supply to the inlet
connection of an automatic fill valve.
2. Install a suitable back flow preventer between the
automatic fill valve and the cold water supply.
3. Install shut off valves where required.
The boiler piping system of a hot water heating
boiler connected to heating coils located in air handling
appliances where they may be exposed to refrigerated
air circulation must be equipped with flow control
valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle.
A boiler installed above radiation level, or as
required by the authority having jurisdiction, must be
provided with a low water cutoff device either as a part
of the boiler or at the time of boiler installation.
6A.3 Freeze Protection
WARNING
Glycol must not be used in domestic hot water
applications. Refer to Section 6B.4 for instructions on
KW, domestic hot water freeze protection.
Keystone units are certified for indoor use only,
and are not design-certified for placement outdoors.
Proper precautions for freeze protection are
recommended for boiler installations in areas where the
danger of freezing exists.
Power outage, interruption of gas supply, failure of
system components, activation of safety devices, etc.,
may prevent a boiler from firing. Any time a boiler is
subjected to freezing conditions, and the boiler is not
able to fire, and/or the water is not able to circulate,
there is a risk of freezing in the boiler or in the pipes
in the system. When water freezes, it expands which
may result in bursting of pipes, or damage to the boiler,
which could result in leaking or flooding conditions.
Do not use automotive antifreeze. To help prevent
freezing, TriangleTube recommends the use of inhibited
glycol concentrations between 20% and 35% glycol.
Typically, this concentration will serve as burst
protection for temperatures down to approximately -5°F
(-20°C). If temperatures are expected to be lower than -
5°F (-20°C), glycol concentrations up to 50% can be
used. When concentrations greater than 35% are used,
water flow rates must be increased to maintain a 20°F
to 25°F temperature rise through the boiler.
NOTE: TriangleTube supplied pumps are not all
capable of maintaining the reduced temperature rise
required with glycol concentrations greater than
35%. If glycol concentrations required are greater
than 35% a field supplied pump should be used.
PIPE SIZE,
SIZE INCHES
399 1¼
500 1½
600 1½
750 2
850 2
Table 9. Water Connection Pipe Sizes.
SECTION 6A.
Water Connections - KS Boiler
Section 6 is divided into two parts. The first is
for KS models and is Section 6A. The second
is for KW models and is Section 6B. Refer to
the proper section for instructions in installing
and piping your product. Refer to Table 9 for
pipe sizes required.
6A.1 KS System Piping: Hot Supply
Connections
NOTE: This appliance must be installed in a closed
pressure system with a minimum of 12 psi (82.7kPa)
static pressure at the boiler.
Hot water piping should be supported by suitable
hangers or floor stands. Do not support piping with this
appliance. Due to expansion and contraction of copper
pipe, consideration should be given to the type of
hangers used. Rigid hangers may transmit noise through
the system resulting from the piping sliding in the
hangers. It is recommended that padding be used when
rigid hangers are installed. Maintain 1" (2.5cm)
clearance to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to
a drain or in a manner to prevent injury in the event of
pressure relief. Install an air purger, an air vent, a
diaphragm-type expansion tank, and a hydronic flow
check in the system supply loop. Minimum fill pressure
must be 12psig (82.7kPa). Install shutoff valves where
required by code.
Suggested piping diagrams are shown in Figures
14 through 20. These diagrams are meant only as a
guide. Components required by local codes must be
properly installed.
Keystone's efficiency is higher with lower
return water temperatures. Therefore, to get the most
of low return temperature with multiple boilers, pipe as
shown in Figures 16-18.
Keystone with a pump MUST be piped in a
primary-secondary fashion (using either piping or a
hydraulic separator) such that the pump that is mounted
on the boiler ONLY serves the boiler.
The pump should be sized for the boiler per Table
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