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IX. Hydronic Piping (continued)
C. Standard Piping Components
1. Pressure relief Valve (Required)
a. The pressure relief valve must be installed with
spindle in vertical position. Installation of the
pressure relief valve must comply with ASME
Boiler and Pressure Vessel Code, Section IV.
b. If the pressure 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 pressure relief
valve, verify the temperature and pressure gauge
meets ASME requirements for the replacement
pressure relief valve.
c. Pipe the pressure 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 pressure relief valve is not piped to a drain,
it must terminate at least 6 in. (150mm) above the
floor. Do not run pressure 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. Drain Valves
A factory installed 3/4" NPT drain valve and
connection is provided with the unit.
3. Flow Switch (Factory Supplied)
This appliance is CSD-1 compliant and equipped
with water flow switch and reset low water cut out
box. A flow switch is required for forced circulation
coil-type water boilers to prevent overheating
and the heat exchanger failure in accordance with
requirements of ASME Boiler and Pressure Vessel
Code, Section IV, and ANSI/ASME CSD-1 "Controls
and Safety Devices for Automatically Fired Boilers".
4. Circulator Pump (Required)
Near boiler pump is required to maintain minimum
flow requirements for proper operation of the
boiler. It is the responsibility of the installer to size
and install near boiler pump(s). Refer to Table 24
for boiler specific head losses.
5. Expansion Tank (Required)
If this appliance is replacing an existing appliance
with no other changes in the system, the old
expansion tank can generally be reused. If the
expansion tank must be replaced, consult the
expansion tank manufacturer's literature for proper
sizing.
38
WARNING
WARNING
Scald Hazard. Pressure 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, caps, or
reducers in the discharge piping.
Discharge line shall be installed to allow complete
drainage of both the valve and the line.
Consult local codes for proper discharge pipe
arrangement.
Observe a minimum of 1/2 inch (12 mm) clearance
around all uninsulated hot water piping.
6. Fill Valve (Required)
Either manual (recommended) or automatic fill
valve may be used.
NOTICE
NOTICE
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.
7. 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.
8. Y-strainer (Recommended)
A Y-strainer or equivalent strainer removes heating
system debris from the hydronic systems and
protects the heat exchanger. Install the strainer in
the cold water connection piping between the tank
and the appliance.
9. Isolation Valves (Recommended)
Isolation valves are useful for servicing and stopping
water flow in the case of failure. Full port ball valves
are required.
10. Flow Control Valve (Strongly Recommended)
The flow control valve prevents flow through
the system unless the circulator is operating.
Flow control valves are used to prevent gravity
circulation in circulator zone systems through zones
that are not calling for heat.
AMP 400-1000L I&O Manual
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