LAARS Rheos+ RHHV - Install and Operating Manual - Manual (Page 37)

LAARS Heating Systems Page 36
Section 6
OPERATING INSTRuCTIONS
6.1 Filling the Boiler System
1. Ensure the system is fully connected. Close all
bleeding devices and open make-up water valve.
Allow system to fill slowly.
2. If make-up water pump is employed, adjust
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 bleeding devices on all radiation units
at the high points in the piping throughout
the system, unless automatic air bleeders are
provided at such points.
Note that there is an air bleed (coin vent)
located in the back of the unit, on top of the
flue collector, to bleed air from the secondary
(stainless steel) heat exchanger.
5. Run system circulating pump for a minimum of
30 minutes with the boiler shut off.
6. Open all strainers in the circulating system,
check flow switch operation, and check for
debris. If debris is present, clean out to ensure
proper circulation.
7. Recheck all air bleeders as described in Step 4.
8. Check liquid level in 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 boiler according the procedure in this
manual. Operate the entire system, including the
pump, boiler, and radiation units for one (1) 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.
12. Close make-up water valve and check strainer in
pressure reducing valve for sediment or debris
from the make-up water line. Reopen make-up
water valve.
13. Check gauge for correct water pressure and also
check water level in the system. If the height
indicated above the boiler insures 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. Main gas terminals will be energized,
attempting to light, for seven (7) seconds, and
then will de-energize. The unit will go into
lockout mode. Second, turn the power off, press
the manual reset button on the ignition control,
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 in
Steps 4 and 8 above.
Important: 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.
6.2 Operating the Burner and Set up
The Rheos+ modulating appliance utilizes an
advanced, state-of-the-art design. The setup must be
checked before the unit is put in operation. Problems
such as failure to start, rough ignition, strong exhaust
odors, etc. can be due to improper setup. Damage to
the boiler resulting from improper setup is not covered
by the limited warranty.
REQUIRED TOOLS:
Differential pressure gauge capable of reading
negative 0.01 inches W.C. (0.002kPa).
1. Using this manual, make sure the installation
is complete and fully in compliance with the
instructions.
2. Determine that the appliance and system are
filled with water and all air has been bled from
both. Open all valves.
3. Observe all warnings on the Operating
Instructions label and turn on gas and electrical
power to appliance.
4. There is a gas/air test panel to the left of the
control panel, at the front of the unit (see Figures
25 and 32). Ensure that all four valves on the test
panel are closed (see Figure 26).