Fire Coil 85
(500-2000)
Page 29
normally occurs, it should be isolated from the
system and completely drained of all water. All
systems connected to it should also be drained or
protected from freezing.
6.
Low water cutoffs, if installed, should be checked
every 6 months. Float type low water cutoff should
be flushed periodically.
7.
Inspect flue passages, and clean with brushes/
vacuums, if necessary. Sooting in flue passages
indicates improper combustion. Determine the
cause and correct.
8.
Inspect the vent system and air intake system, and
if the vent system is Category III, ensure that all
joints are sealed properly. If joints need to be
resealed, completely remove existing sealing
material, and clean with alcohol. Apply new sealing
material, and re-assemble.
7.2 Appliance Maintenance and
Component Description
Only genuine NATCO replacement parts should be used.
Caution
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan-
gerous operation. Verify proper operation after servicing.
See
Figure 5
for location of gas train components.
The gas and electric controls on the appliance are
engineered for long life and dependable operation, but
the safety of the equipment depends on their proper
functioning. It is strongly recommended that a qualified
service technician inspect the basic items listed below
every year.
a.
Ignition controls
b.
Ignitors
c.
Water temperature control
d.
Automatic gas valve
e.
Pressure switches
f.
Blowers
7.2.1 Burners
Close main manual gas valve before proceeding.
Checking the burners for debris - Remove the ignitor
inspection panels(s) and ignitor(s) and inspect the burners
through the ignitor hole(s) using a flashlight to illuminate.
If there is any indication of debris on the burners that are
visible, all the burners will need to be inspected more
thoroughly. Remove the screws from around the front of
the air box (large panel from which the ignitor inspection
panel(s) were removed), and remove the large panel.
Remove the gas manifold assemblies and the burner
panels. Inspect the burners. Clean burners, if necessary,
by blowing compressed air from the outside of the
burners into the center of the burner. A dirty burner may
be an indication of improper combustion or dirty
The procedure is complete when all gas valves are
adjusted to a manifold pressure of 3.0 in. W.C. (0.75
kPa) and the CO
2
is adjusted to 8.0% for Natural Gas
appliances or 9.2% for LP appliances (to be checked
only at full fire). When using an O
2
analyzer, the correct
O
2
is 6.8% for both Natural Gas and LP appliances.
Caution
Should any odor of gas be detected, or if the gas
burner does not appear to be functioning in a normal
manner, close main shutoff valve, do not shut off
switch, and contact your heating contractor, gas
company, or factory representative.
6.7 Shutting Down the Fire Coil 85
1.
Switch off the main electrical disconnect switch.
2.
Close all manual gas valves.
3.
If freezing is anticipated, drain the Fire Coil 85 and be
sure to also protect building piping from freezing.
This step to be performed by a qualified service
person.
6.8 To Restart the Fire Coil 85
If drained, follow
Section 6.2
in this manual for
proper filling and purging.
1.
Switch off the main electrical disconnect switch.
2.
Close all manual gas valves.
3.
WAIT FIVE (5) MINUTES.
4.
Set the aquastat or thermostat to its lowest setting.
5.
Open all manual gas valves.
6.
Reset all safety switches (pressure switch, manual
reset high limit, etc.).
7.
Set the temperature controller to the desired
temperature setting and switch on electrical power.
8.
Burner will go through a prepurge period and
ignitor warm-up period, followed by ignition.
SECTION 7.
Maintenance
7.1 System Maintenance
1.
Lubricate the system water-circulating pump, if
required, per the instructions on the pump.
2.
If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.
3.
Inspect the venting system for obstruction or
leakage at least once a year. Periodically clean the
screens in the vent terminal and combustion air
terminal (when used).
4.
Keep the appliance area clear and free from
combustible materials, gasoline, and other
flammable vapors and liquids.
5.
If the appliance is not going to be used for
extended periods in locations where freezing
Summary of Contents for Fire Coil 85
Page 23: ...Fire Coil 85 500 2000 Page 23 Figure 19 Fire Coil 85 500 750 Connection Diagram ...
Page 24: ...National Combustion Co Inc Page 24 Figure 20 Fire Coil 85 1000 Connection Diagram ...
Page 25: ...Fire Coil 85 500 2000 Page 25 Figure 21 Fire Coil 85 1250 2000 Connection Diagram ...
Page 37: ...Fire Coil 85 500 2000 Page 37 Figure 23 Sheet Metal Components ...
Page 38: ...National Combustion Co Inc Page 38 Figure 24 Internal Components ...
