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Installation & Operation Manual
27
6 Hydronic piping
System water piping methods
The Knight wall mount is designed to function in a closed
loop pressurized system not less than 12 psi. A temperature
and pressure gauge is included to monitor system pressure
and outlet temperature and should be located on the boiler
outlet.
It is important to note that the boiler has a minimal amount
of pressure drop and must be figured in when sizing the
circulators. Each boiler installation must have an air
elimination device, which will remove air from the system.
Install the boiler so the gas ignition system components are
protected from water (dripping, spraying, etc.) during
appliance operation for basic service of circulator
replacement, valves, and others.
Observe a minimum of 1 inch clearance around all
un-insulated hot water pipes when openings around the
pipes are not protected by non-combustible materials.
Low water cutoff device
On a boiler installed above radiation level, some states and
local codes require a low water cutoff device at the time of
installation.
Chilled water system
If the boiler supplies hot water to heating coils in air
handler units, flow control valves or other devices must be
installed to prevent gravity circulation of heater water in the
coils during the cooling cycle. A chilled water medium
must be piped in parallel with the heater.
Freeze protection
Freeze protection for new or existing systems must use
glycol that is specially formulated for this purpose. This
includes inhibitors, which prevent the glycol from attacking
the metallic system components. Make certain to check
that the system fluid is correct for the glycol concentration
and inhibitor level. The system should be tested at least
once a year and as recommended by the producer of the
glycol solution. Allowance should be made for the
expansion of the glycol solution in the system piping.
General piping information
Basic steps are listed below along with illustrations on the
following pages (FIG.’s 6-3 - 6-7), which will guide you through
the installation of the Knight wall mount boiler (reference
FIG. 6-1).
1. Connect the system return marked “Inlet”, make sure to
install with pipe sealant compound.
2. Connect the system supply marked “Outlet”, make sure to
install with pipe sealant compound.
3. Install purge and balance valve or shutoff valve and drain on
system return to purge air out of each zone.
4. Install a backflow preventer on the cold feed make-up water
line.
5. Install a pressure reducing valve on the cold feed make-up
water line, (15 psi nominal). Check temperature and
pressure gauge (shipped separately), which should read a
minimum pressure of 12 psi.
6. Install a circulator as shown on the piping diagrams in this
section. Make sure the circulator is properly sized for the
system and friction loss.
7. Install an expansion tank on the system supply. Consult the
tank manufacturer’s instruction for specific information
relating to tank installation. Size the expansion tank for the
required system volume and capacity.
8. Install an air elimination device on the system supply.
9. Install a drain valve at the lowest point of the system. Note:
The boiler cannot be drained completely of water without
purging the unit with an air pressure of 15 psi.
10. This appliance is supplied with a relief valve sized in
accordance with ASME Boiler and Pressure Vessel Code,
Section IV (“Heating Boilers”). The safety relief valve is
installed at the factory located on the left-hand side of the
boiler. Pipe the discharge of the safety relief valve to prevent
injury in the event of pressure relief. Pipe the discharge to
a drain. Provide piping that is the same size as the safety
relief valve outlet. Never block the outlet of the safety relief
valve.
See the *piping illustrations included in this section, FIG.’s 6-3 -
6-7 for suggested guidelines in piping the Knight wall mount
boiler with either zone valves or circulator pumps.
*Please note that these illustrations are
meant to show system piping concept only,
the installer is responsible for all equipment
and detailing required by local codes.
Use only inhibited propylene glycol
solutions, which are specifically
formulated for hydronic systems.
Ethylene glycol is toxic and can attack
gaskets and seals used in hydronic
systems.
ƽ WARNING
NOTICE