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GAS-FIRED HEATER Installation Manual
PART 15: MAINTENANCE
A. MAINTENANCE PROCEDURES
Periodic maintenance should be performed
once a year by a qualified service technician to
assure that all the equipment is in safe efficient
operation. The owner can make necessary
arrangements with a qualified heating contrac-
tor for periodic maintenance of the heater.
Installer must also inform the owner that the lack
of proper care and maintenance of the heater
may result in a hazardous condition. The
installer should discuss the contents of the
User's Information Manual with the owner.
Outdoor Sensor (7250P-319)
Outside Temperature (°F) Resistance (ohms)
–22 171800
–13 129800
–4 98930
5 76020
14 58880
23 45950
32 36130
41 28600
50 22800
59 18300
68 14770
77 12000
86 9804
95 8054
104 6652
113 5522
Heater Sensor (7250P-059)
Indirect Sensor
(7250P-320)
Heater and Indirect Temperature (°F) Resistance (ohms)
32 32550
41 25340
50 19870
59 15700
68 12490
77 10000
86 8059
95 6535
104 5330
113 4372
122 3605
131 2989
140 2490
149 2084
158 1753
167 1481
176 1256
185 1070
194 915
203 786
212 667
PART 14: TROUBLESHOOTING
(CONTINUED)
Resistance Tables
Fig. 14-3
Fig. 14-2
NOTE: If receiving an
F09 fault code, check
the gap spacing
between points on the
electrode by holding
two quarters together
and sliding them
through the gap. There
should be a slight
resistance.
WARNING
BEFORE EACH HEATING SEASON A trained
and qualified service technician should perform
the inspections as per the heater inspection and
maintenance schedule in the back of manual.
Failure to do so could result in death or serious
injury.