18
5.4 Trim Piping
• Temperature - Pressure Gauge. Install temperature
pressure gauge. See Figures 5-1 and 5-2.
• Some boiler models may have integral drain valve located
inside jacket directly underneath pump. Install provided
external drain valve as required.
5.5 System Piping
• Ensure caps are removed from boiler water connections.
•
See Figure 5-6 for a basic system piping configuration.
•
Systems with automatic fill valves require back flow
prevention device.
• Single boiler system. See Figure 5-6 for general guidance.
Additional considerations:
• Boiler control does not accommodate central heating
pump. Installer is responsible for integration of
central heating pumps with field sourced control.
• Boiler control allows domestic hot water
prioritization. Function could be lost if central heating
pump is not directly connected to zone control system.
• Multiple boiler system. Considerations:
• Field sourced control system logic may require
equivalent water temperatures entering each boiler
to properly sequence and adjust system supply
temperature.
WARNING
Burn and scald hazard. Verify all plastic caps are
removed from boiler connections. Failure to follow
these instructions could result in death or serious
injury.
!
•
Thoroughly flush all hydronic piping.
Flush system
(wash) clean after installing all piping. Debris or cutting
oils, etc., left inside system will reduce heat transfer in
heat exchanger. Small pieces of Teflon tape are eventually
trapped in the water pump impeller and reduce water flow
rate. Non-flushed systems have low energy efficiency and
potential boiling noise due to ineffective heat transfer and
reduced water flow rate. Flush all zones one by one, when
flushing the system.
•
Secure all valves/fittings to boiler.
• Connect system valve pipe work to the boiler.
•
Route pressure relief valve discharge piping to the floor.
Follow local code with respect to necessary distance to the
floor.
See Figure 5-2.
• Verify all valves are closed.
5 - HYDRONIC PIPING
5.6 External Optional Low Water Cut Off
These guidelines are supplied when necessary to install an
additional Low Water Cut Off (LWCO), for sensing a low water
level condition in a boiler, as required by the Authority Having
Jurisdiction.
Follow LWCO manufacturer installation instructions for type of
LWCO selected in addition to these instructions.
LWCO shall be 120V/60HZ control and dry contacts sized for
load being connected. Wire control to boiler. See Figure 5-4.
Connect LWCO device to the system ground. Ground in
accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with the
National Electrical Code (NEC) or Canadian Electrical Code
CEC.
• Locate LWCO sensing device in the supply piping, or in
a stand pipe off the boiler supply, above the minimum
height of boiler. See Figure 5-3, Piping Diagram.
• Position control in HORIZONTAL piping to assure proper
boiler protection (upright or 90° rotation).
• For proper operation, sensing element of the LWCO
control shall be positioned in the tee to sense the main
water stream. Maintain minimum 1/4” spacing from pipe
walls. Element shall NOT contact the rear, or side walls of
the tee. See Figure 5-5.
• Install an air vent using a tee to avoid nuisance
shutdowns.
• Apply small amount of pipe sealant to threaded
connections.
• Arrange piping to prevent water dripping onto boiler.
•
DO NOT install water shutoff valve between boiler and
LWCO sensing device.
• Manufacturer recommends installing an isolation and purge
valve to use during commissioning to ensure the boiler
does not shut down due to over temperature. See Figure
5-3 for details.
•
Do not install isolation valve between boiler and any field
installed LWCO.
PN 240012363 REV. B [03/29/2019]
