LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 66)

LAARS Heating Systems Page 62
12. 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.
13. 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.
14. 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.
15. After placing the unit in operation, the ignition
system safety shutoff device must be tested.
First, shut off the manual gas valve, and call the
unit for heat. The main gas terminals will be
energized, attempting to light, for five seconds,
and then will de-energize. The unit will go into
lockout after the required number of trial 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 days of start-up, recheck all air
bleeders and the expansion tank as described in
Steps 4 and 8 above.
Note -
The installer is responsible for identifying to
the owner/operator the location of all emergency
shutoff devices.
WARNING
Do not use this appliance if any part has
been under water. Immediately call a qualified
service technician to inspect the appliance
and to replace any part of the control system
and any gas control that may have been
under water.
Section 10
INITIAL STARTUP INSTRUCTIONS
10.1 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.
Note
- There are three air bleeds located on top of
the water manifold.
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. Recheck all air bleeders as described in Step 4.
8. 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.
9. Start up the boiler following the procedure
in this manual. Operate the entire system,
including the pump, boiler, and radiation units
for one hour.
10. Recheck the water level in the expansion tank.
If the water level exceeds ¼ of the volume of
the expansion tank, open the tank drain, and
drain to that level.
11. Shut down the entire system and vent all
radiation units and high points in the system
piping, as described in Step 4.