PART 5: BOILER PIPING (CONTINUED)
Basic steps are listed below, with Illustration,
that will guide you through the installation of the
Mod Con.
1. Connect the system return marked “Boiler
Return”.
2. Connect the system supply marked “Boiler
Supply”.
3. Install Purge and Balance Valve or shut off
valve and drain on system return to purge air
out of each zone.
4. Install a Back Flow preventor 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 on
the system return). Check Temperature and
Pressure Gauge when operating. It should
read minimum pressure of 12 PSI.
6. Install a circulator as shown in piping details
(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
expansion 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 Mod Con Boiler can not be
drained completely of water without purging
the unit with an air pressure 15 PSI.
10. The relief valve is installed at the factory. A
pipe discharge line should be installed 6”
above the drain in the event of a pressure
relief. The pipe size must be the same size as
the relief valve outlet. NEVER BLOCK THE
OUTLET OF THE SAFETY RELIEF VALVE.
H. CIRCULATOR SIZING
The Mod Con Boiler Heat Exchanger does have
pressure drop which must be considered in
your system design. Refer to the graph in Fig. 5-
1 for pressure drop through the Mod Con Boiler
Heat Exchanger.
n
CAUTION
The Mod Con Boiler should not be operated as
a potable Hot Water Heater. It should not be
used as a direct Hot Water Heating Device.
GAS-FIRED BOILER Boiler Manual
20
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