NTI FTVN - Page 96

96
Part 16 - Shutdown
Outdoor Sensor
Supply/Return Temperature Sensors
Tank Sensor
DHW Outlet Sensor
Outside
Temperature
(
o
F)
Resistance
(ohms)
Water Temp.
(
o
F)
Resistance (Ohms)
-22 178605 32 27219
-13 132045 41 22021
-4 98438 50 17926
5 73995 59 14674
14 56079 68 12081
23 42846 77 10000
32 32997 86 8315
41 25609 95 6948
50 20027 104 5834
59 15777 113 4917
68 12517 122 4161
77 10000 131 3535
86 8042 140 3014
95 6510 149 2586
104 5302 158 2228
113 4343 167 1925
176 1669
185 1452
194 1268
202 1110
212 974
Table 35 - Sensor Temperature Resistance
A. Shutdown Procedure
Turn the boiler o at the on/o power switch. Wait for the combustion
blower to stop, so all latent combustion gases are purged from the
system. This could take a maximum of 5 minutes.
B. Failure to Operate
Should the burner fail to light, the control will perform four more
ignition trials prior to entering a lockout state. Note that each
subsequent ignition trial will not occur immediately. After a failed
ignition trial, the blower must run for approximately 5 seconds to
purge the system.
If the burner lights during any one of these ve ignition trails, normal
operation will resume.
If the burner does not light after the fth ignition trial, the control will
enter a lockout state.
This lockout state indicates that a problem exists with the boiler, the
controls, or the gas supply.
Under such circumstances, a qualied service technician should be
contacted immediately to properly service the boiler and correct the
problem. If a technician is not available, press a button on the display
to wake it. Then press the RESET button to remove the lockout state so
additional trials for ignition can be performed.
If the RESET key is not pressed (error code 501 or 503), the boiler will
reset automatically after an hour.
C. Important
It is extremely important that whenever work is performed on the
plumbing system that either:
• The appliance is powered o, and,
• The area that is being worked on is valved o and isolated.
Failure to take these measures could result in a dry-ring
condition, explosion or re, substantial property damage, severe
personal injury, or death.
WARNING