106636-02 - 12/19
18
X-2
Installation, Operating & Service Manual
9
System Start-up and Checkout
A. Visual Main Burner Check
Inspect burners for dislodgement during
shipment. Rear of burners should be in vertical
slots in rear of burner tray and front of burners
should be seated completely on orifices.
B. Initial LWCO Test
Before filling boiler with water, turn on power
to boiler and set thermostat to call for heat.
Both the green "POWER" LED and amber "LOW
WATER" LED should illuminate (see Figure 9-1).
Burner should not fire.
D. Purge Air from System
1. Fill entire heating system with water and
vent air from boiler, radiators and system,
one zone at a time.
2. Isolate boiler by closing isolation valves. For
primary - secondary systems, close additional
isolation valve to ensure water flows through
zones.
3. Isolate all circuits by closing zone valves
or turning off zone circulators.
4. Attach hose to drain valve located
on return piping (see Figure 6-2 and 6-3).
Note-Terminate hose in five gallon bucket,
at a suitable floor drain, or outdoor area).
5. Starting with one circuit, open zone valve or
start circulator.
6. Open drain valve.
7. Open fill valve.
8. Allow water to flow through system until
discharge from hose is bubble free for 30
seconds.
9. Open zone valve or start circulator to second
zone to be purged, then close first.
Repeat this step until all zones have
been purged, but always have one zone
open. At completion, open all zone valves.
10. Close hose bib, open boiler isolation
valve, continue filling system until
pressure gauge reads 12 psi.
Close fill valve. (Note - If make-up water
line is equipped with pressure reducing
valve, system will automatically fill to 12
psi).
11. Remove hose from drain valve.
Figure 9-1: IDL 1200 Low Water Cut-Off
C. Fill Boiler with Water
1. Proceed to fill boiler with water. When water
reaches IDL 1200 Sensor, "LOW WATER" LED
will turn off and burner will fire.
2. Turn off power to boiler and finish filling
system.
WARNING
If the burner fires with no water at probe,
immediately shut down power to boiler and
contact customer service for assistance.
!
