Install Instructions

Page 48
LAARS Heating Systems
units and high points in the system piping, as
described in Step 4.
10. Close the make-up water valve and check the strainer
in the pressure reducing valve for sediment or debris
from the make-up water line. Reopen the make-up
water valve.
11. Check the gauge for correct water pressure and also
check the 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.
12. Prime the condensate trap with water.
13. Refer to local codes and the make-up water valve
manufacturers instructions as to whether the make-up
water valve should be left open or closed.
14. After placing the unit in operation, the ignition system
safety shuto󰀨 device must be tested.
First, shut o󰀨 the manual gas valve, and call the unit
for heat. The main gas terminals will be energized,
and attempt to light, for four seconds, and then will
de-energize. The unit will go into lockout after the
required number of trial for ignition periods.
Next, turn the power O󰀨, and then On again. Press
the manual reset button on the boiler 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.
15. Within three days of start-up, recheck all air bleeders
and the expansion tank as described in Steps 4.
Important Note: The installer is responsible for identifying
to the owner/operator the location of all emergency shuto󰀨
devices.
WARNING
Do not use this boiler if any part has been under
water. Manufacturer requires boilers to be replaced,
not repaired, if they have been partially or completely
submerged.
SECTION 9 FIRST START-UP
AND ADJUSTMENT
INSTRUCTIONS
9.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 ll slowly.
2. If a make-up water pump is employed, adjust the
pressure switch on the 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 all of the bleeding devices on all radiation units
at the high points in the piping throughout the system,
unless automatic air bleeders are provided at these
points.
Note - There is an air bleed (air vent with slotted top)
located on the left side of heat exchanger, on top of
the water manifold.
5. To remove all air from the heat exchanger, cycle the
boiler pump on and o󰀨 10 times, 10 seconds on and
10 seconds o󰀨 . Then run the system and appliance
pumps for a minimum of 30 minutes with the gas shut
o󰀨.
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 ow switch (if equipped), and check
for debris. If any debris is present, clean it out to
ensure proper circulation.
7. Recheck all air bleeders as described in Step 4.
8. Start up the boiler according to the procedure listed in
this manual. Operate the entire system, including the
pump, boiler, and radiation units for one hour.
9. Shut down the entire system and vent all radiation
Figure 37. Air Vent