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AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
4a
Water piping — general information
General piping information
1.
Pipe as shown in Figure 12. Refer to I=B=R
Installation and Piping Guides for additional
recommendations.
2.
If system is to comply with ASME or Canadian
requirements, an additional high temperature limit
is needed. Install control in supply outlet piping
close to the boiler. See page 23 for wiring.
3.
A low water cutoff device is required for hot water
boilers installed above radiation level or by certain
state or local codes or insurance companies. Block
temperature switch, installed as standard
equipment on the boiler, monitors surface
temperature, causing gas controls to shut down
should low water condition occur.
4.
Install cold water fill as shown in Figure 12.
5.
Where heat distributing units are below boiler,
provide a drain valve at low point in system.
6.
Use zone valves for multiple zone applications.
Refer to manufacturer's literature for wiring and
application.
Figure 12 Water piping diagram
Cold water fill
Expansion
tank
Drain valves
88712
Note: Use zone valves in each circuit for multiple circuit applications.
Part number 550-141-887/0800
Supply
Return
Shutoff valves
To system
From system
Expansion tank
1.
A correctly-sized diaphragm-type expansion tank
must be provided. Ensure expansion tank will
handle boiler and system water volume and
temperature.
2.
Follow tank manufacturer's sizing procedure to
determine proper size.
3.
Locate expansion tank as shown in Figure 12.
External heat exchangers
AHE boilers can be used with storage tank/heat
exchanger unit for domestic hot water. Boiler/tank
combination should be installed and wired in
accordance with tank manufacturer's instructions,
which will also show any additional components
required. A zone valve must be installed to regulate
production of hot water.
Relief valve
Verify relief valve is installed with spindle in vertical
position. See Figure 33, item 1, page 45 and the tag
attached to the relief valve for manufacturer's
instructions.
To avoid water damage or scalding
due to relief valve operation:
• Discharge line must be connected to relief valve
outlet and run to a safe place of disposal. Terminate
the discharge line to eliminate possibility of severe
burns should the valve discharge.
• Discharge line must be as short as possible and be
the same size as the valve discharge connection
throughout its entire length.
• Discharge line must pitch downward from the valve
and terminate at least 6" above the floor drain
where any discharge will be clearly visible.
• The discharge line shall terminate plain, not
threaded, with a material serviceable for
temperatures of 375 °F or greater.
• Do not pipe the discharge to any place where
freezing could occur.
• No shutoff valve shall be installed between the relief
valve and boiler, or in the discharge line. Do not
plug or place any obstruction in the discharge line.
• Failure to comply with the above guidelines could
result in failure of the relief valve to operate,
resulting in possibility of severe personal injury,
death or substantial property damage.
• Test the operation of the valve after filling and
pressurizing system by lifting the lever. Make sure
the valve discharges freely. If the valve fails to
operate correctly, replace it with a new relief valve.
15
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