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IX. Hydronic Piping (continued)
1. Safety Relief Valve (Required) -The safety
E. Standard Installation Requirements
relief valve is shipped loose with the boiler
and must be installed in the location shown
in Figure 13.
a. The safety relief valve must be installed with
spindle in vertical position. Installation of
safety relief valve must comply with ASME
Boiler and Pressure Vessel Code, Section
IV. For standard and opitional safety relief
valve for specific boiler model refer to Table
2.
b. If the safety relief valve is to be replaced,
the replacement valve must have a
relief capacity equal or exceeding the
minimum relief valve capacity shown on
the heat exchanger ASME plate. Also, when
replacing the safety relief valve, verify the
temperature and pressure gauge meets
ASME requirements for the replacement
safety relief valve.
c. Pipe the safety relief valve discharge to a
location where hot water or steam will not
create hazard or property damage if the
valve discharges. The end of the discharge
pipe must terminate in an untreated pipe.
d. If the safety relief valve is not piped to
a drain, it must terminate at least 6 in.
(150mm) above the floor.Do not run safety
relief valve discharge pipe through an
area prone to freezing. The termination of
discharge piping must be in an area where
it will not became plugged by debris.
2. Flow Switch (Required) -The flow switch is
factory provided. A flow switch is required in
lieu of manual reset low water cutoff (LWCO)
for forced circulation coil-type water boilers
to prevent overheating and heat exchanger
failure in accordance with requirements of
ASME Boiler and Pressure Vessel Code, Section
IV, and ANSI/ASME CSD-1 latest edition,
"Controls and Safety Devices for Automatically
Fired Boiler".
Burn Hazard. Safety relief valve discharge shall
be piped in such a way to prevent or eliminate
potential burn risk.
DO NOT pipe in any area where freezing could
occur.
DO NOT install any shut-off valves, plugs or
caps.
Consult local codes for proper discharge pipe
arrangment.
Observe a minimum of 1/2 inch (12 mm)
clearance around all uninsulated hot water
piping.
3. Circulator (Required) -Near boiler pump
is required to maintain minimum flow
requirements for proper operation of the
boiler. It is the responsiblity of the installer
to size and install near boiler pump(s). Refer
to Table 13 for boiler specific head losses.
4. Expansion Tank (Required) -If this boiler
is replacing an existing boiler with no other
changes in the system, the old expansion tank
can generally be resused. If the expansion tank
must be replaced, constult the expansion tank
manufacturer's literature for proper sizing.
5. Fill Valve (Required)-Either manual
(recommended) or automatic fill valve may be
used. However, if automatic refill is employed,
a water meter must be added to evaluate the
makeup water volume taken after initial fill
and eliminate any water leakage as early as
possible.
6. Automatic Air Vent (Required)-At least one
automatic air vent is required. Manual vents
will usually be required in other parts of the
system to remove air during initial fill.
7. Y-strainer (Recommended)-A Y-strainer or
equivalent strainer removes heating system
debris from the hydronic systems and protects
boiler heat exchanger from fouling.
37
WARNING
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