Page 105
water level exceeds ¼ of the volume of the expansion
tank, open the tank drain, and drain to that level.
10. Shut down the entire system and vent all radiation
units and high points in the system piping, as
described in Step 4.
11. Close the make-up water valve. Check the strainer
in the pressure reducing valve for sediment or debris
from the make-up water line. Reopen the make-up
water valve.
12. Check the gauge for correct water pressure and also
check the water level in the system. If the height
indicated above the boiler ensures that water is at the
highest point in the circulating loop, then the system
is ready for operation.
13. Refer to local codes and the make-up water valve
manufacturer’s instructions as to whether the make-up
water valve should be left open or closed.
14. Press the reset on the low pressure switch.
15. After placing the unit in operation, the ignition system
safety shutoff device must be tested.
First, shut off the manual gas valve, and then call the
unit for heat. The main gas terminals will be energized
and attempting to light for five seconds and then will
de-energize. The unit will go into lockout after the
required number of trials for ignition periods.
Second, press the manual reset button on the boiler
control, or the user display, open the manual gas
valve and allow the unit to light. While the unit is
operating, close the manual gas valve and ensure
that power to the main gas valve has been cut.
16. Within three (3) days of start up, recheck all air
bleeders and the expansion tank as described
previously in Steps 4 and 8.
NOTE - The installer is responsible for identifying to the
owner/operator the location of all emergency shutoff
devices.
WARNING
Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect
the unit and to replace any part of the control system
and any gas control that may have been under water.
SECTION 11
Initial startup
Instructions
11.A Filling the Boiler System
1. Ensure the system is fully connected. Close all
bleeding devices and open the make-up water valve.
Allow the system to fill slowly.
2. If a make-up water pump is employed, adjust the
pressure switch on pumping system to provide a
minimum of 12 psi (81.8 kPa) at the highest point in
the heating loop.
3. If a water pressure regulator is provided on the make-
up water line, adjust the pressure regulator to provide
at least 12 psi (81.8 kPa) at the highest point in the
heating loop.
4. Open any bleeding devices on all radiation units at
the high points in the piping throughout the system,
unless automatic air bleeders are provided at those
points.
5. To remove all air from the heat exchanger, cycle
the boiler pump on and off 10 times (10 seconds on
and 10 seconds off). Then run the system and boiler
pumps for a minimum of 30 minutes with the gas shut
off.
NOTE - There are three (3) air bleeds located on top of
the water manifolds.
WARNING
Failure to remove all air from the heat exchanger could
lead to property damage, severe injury or death.
6. Open all strainers in the circulating system, check the
operation of the flow switch (if equipped), and check
for debris. If debris is present, clean out the strainers
to ensure proper circulation.
7. Check the liquid level in the expansion tank. With
the system full of water and under normal operating
pressure, the level of water in the expansion tank
should not exceed ¼ of the total with the balance
filled with air.
8. Start up the boiler following the procedure in this
manual. Operate the entire system, including the
pump, boiler, and radiation units for one hour.
9. Recheck the water level in the expansion tank. If the
The
O
MNI
T
HERM
