Instructions / Assembly

LP-387 Rev. 011 Rel. 006 Date 6.28.19
62
Part 13 - Maintenance
A. Procedures
Periodic maintenance should be performed once a year by a qualied
service technician to assure that all the equipment is operating safely
and eciently. The owner should make necessary arrangements with
a qualied heating contractor for periodic maintenance of the boiler.
The installer must also inform the owner that a lack of proper care and
maintenance of the boiler may result in a hazardous condition.
BEFORE EACH HEATING SEASON a trained and qualied service
technician should perform the inspections as per the boiler
inspection and maintenance schedule in this manual. Failure to do
so could result in death or serious injury.
The combustion chamber insulation in this product contains ceramic
ber material. Ceramic bers can be converted to cristobalite in
very high temperature applications. The International Agency for
Research on Cancer (IARC) has concluded, “Crystalline silica inhaled
in the form of quartz or cristobalite from occupational sources is
carcinogenic to humans (Group 1).”
• Avoid breathing dust and contact with skin and eyes.
• Use a NIOSH certied dust respirator (N95). This type of
respirator is based on the OSHA requirements for cristobalite at
the time this document was written. Other types of respirators
may be needed depending on job site conditions. Current
NIOSH recommendations can be found on the NIOSH website:
http://www.cdc.gov/niosh/homepage.html. NIOSH approved
respirators, manufacturers, and phone numbers are also listed
on this website.
• Wear long-sleeved, loose tting clothing, gloves, and eye
protection.
• Apply enough water to the combustion chamber lining to
prevent dust.
• Wash potentially contaminated clothes separately from other
clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
• Eye: Irrigate immediately.
• Breathing: Fresh air.
B. Combustion Chamber Coil Cleaning Instructions
*Before beginning this procedure, have on hand the following items:
• a nylon, stainless steel, or brass brush (not steel)
• an FDA approved liquid lime scale remover in a spray bottle
• gloves and eye protection
1. Shut down the boiler by using the following steps:
a. Turn o power to the boiler. Turn thermostats down to ensure
there is no call for heat, or disconnect thermostat connections from
terminals. Close the gas valve inside the boiler cabinet. Wait for the
boiler to be cool to the touch.
b. Disconnect the wires plugged into the fan, spark electrode, ame
rod, and gas valve.
c. Disconnect the exible gas lines from the venture attached to the
fan.
d. Loosen the nuts that hold the burner plate to the heat exchanger.
e. Remove the combustion assembly.
2. Spray water or solution into the combustion assembly and monitor
the ow through the combustion system. Liquid should ow freely
through each tube. If there is an obstruction, increase the ow on the
tube to force blockage out.
3. Once complete, reinstall the combustion assembly with gaskets and
secure nuts. Tighten properly.
a. Reconnect all wire and piping connections. Once connected,
apply power and disconnect the wire harness with the white-blue-
red-black wires to run fan and dry combustion assembly. Let fan run
for ve minutes. When nished, reconnect harness to the fan.
b. Connect the thermostat wires to the eld connection board,
or turn up thermostat to re the combustion system. Check for
leaks in the combustion system. Observe operation for 5 to 10
minutes.
If boiler is operating properly, condensate is owing normally, and
no gas leaks are detected, combustion coil cleaning is complete.
Do not use solvents to clean any of the burner components. The
components could be damaged, resulting in unreliable or unsafe
boiler operation, substantial property damage, severe personal
injury, or death.
Outdoor Sensor
(7250P-319)
Supply Temperature Sensor
(7250P-324)
Boiler Sensor
(7250P-667)
Indirect Sensor
(7350P-325)
Outside
Temperature
(
o
F)
Resistance
(ohms)
High / Low
Temp Sensor
Temp. (
o
F)
Resistance
(Ohms)
-22 171800 32 32550
-13 129800 41 25340
-4 98930 50 19870
5 76020 59 15700
14 58880 68 12490
23 45950 77 10000
32 36130 86 8059
41 28600 95 6535
50 22800 104 5330
59 18300 113 4372
68 14770 122 3605
77 12000 131 2989
86 9804 140 2490
95 8054 149 2084
104 6652 158 1753
113 5522 167 1481
176 1256
185 1070
194 915
202 786
212 667
Table 30 - Sensor Temperature Resistance