Part 13: Maintenance; Maintenance Procedures - Heat Transfer MODCON VWH 300 LP Installation & Maintenance

PART 12: TROUBLESHOOTING
NOTE: If receiving
an F09 fault code,
c h e c k t h e g a p
spacing between
points on the elec-
trode by holding
t w o q u a r t e r s
together and slid-
ing them through
t h e g a p . T h e r e
should be a slight
resistance.
Fig. 12-3

PART 13: MAINTENANCE

A. MAINTENANCE PROCEDURES
Periodic maintenance should be performed
once a year by a qualified service technician to
assure that all the equipment is operating safely
and efficiently. The owner should make neces-
sary arrangements with a qualified heating con-
tractor for periodic maintenance of the heater.
Installer must also inform the owner that the lack
of proper care and maintenance of the heater
63
GAS-FIRED HOT WATER SUPPLY BOILER
(CONTINUED)
Resistance Table
Boiler Sensor (7250P-667) Indirect/Tank Sensor (72 50P-325)
Fig. 12-4
System/Pipe Sensor Temperature Sensor 7250P-324
Water Temperature (°F)
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
167
176
185
194
203
212
may result in a hazardous condition.
n
BEFORE EACH HEATING SEASON A trained
and qualified service technician should perform
the inspections as per the boiler inspection and
maintenance schedule in the back of manual.
Failure to do so could result in death or serious
injury.
Boiler Manual
Resistance (ohms)
32550
25340
19870
15700
12490
10000
8059
6535
5330
4372
3605
2989
2490
2084
1753
1481
1256
1070
915
786
667
WARNING