LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 54)

Page 50 LAARS Heating Systems
ready for operation.
14. Prime the condensate trap with water. (This is not
required for NTH 600, 750, and 850 units.)
15. 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.
16. 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, 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 Off, 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.
17. Within three days of start-up, recheck all air bleeders
and the expansion tank as described in Steps 4 and 8
above.
Important 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. Laars Heating Systems requires boilers and
water heaters to be replaced, not repaired, if they
have been partially or completely submerged.
9.2 First Operation
Caution
The initial 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), screw drivers,
Torx bits, combustion analyzer.
1.
Using this manual, make sure the installation is
complete and in full compliance with the instructions
and all local codes.
2. Determine that the appliance and system are filled with
water and all air has been bled from both. Open all
valves.
Section 9 -
FIRST START-UP AND ADJUSTMENT
INSTRUCTIONS
9.1 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 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 located on the left side of
NeoTherm unit, on top of the water manifold.
5. Cycle the boiler pump on and off 10 times, 10 seconds
on and 10 seconds off, to remove all air from the heat
exchanger. Then run the system and appliance pumps
for a minimum of 30 minutes with the gas shut off.
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 any debris is present, clean it out to ensure
proper circulation.
7. Recheck all air bleeders as described in Step 4.
9. 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.
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 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.
13. 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