TFTN 085-199 Installation and Operation Manual
107
6.
Display is Blank
:
i.
Confirm that the service switch located at the bottom of the control panel (see Figure 18-4) is in the on position.
ii.
Confirm that 120VAC is applied to terminals
LINE
and
NEUTRAL
iii.
Remove the control panel cover and check the cable connecting the display to the main PCB; see Figure 18-4.
iv.
Check the Main PCB Fuses; see Figure 18-4.
Figure 18-4 TFTN Control Panel
Fuses
The TFTN boiler is equipped with nine (9) fuses
–
see Figure 18-4. Check these fuses before replacing any of the controllers
or other electrical component; if the fuse is blown, it will prevent the protected device(s) from functioning.
If replacing a fuse, only replace with an equivalent version
–
see Figure 18-4. Failure to follow this
warning may result in component failure, fire, property damage, serious injury or death.
Main PCB Fuses (120VAC)
–
the main PCB is equipped with two (2) 6.3 Amp Slow-blow fuses (one each on the Line and
Neutral) that protect most 120VAC circuits within the boiler, as well as the
BLR
,
DHW
, and
AUX1 PUMP
outputs.
Zone Controller Fuses (120VAC)
–
the zone controller is equipped with two (2) 2 Amp Slow-blow fuses (one each on the
Line and Neutral).
Zone Output & AUX1 Fuses (120VAC)
–
5 Amp fuses, located on the control panel, protect each of the zone outputs (
ZONE
1
,
ZONE 2
, and
ZONE 3
) and the
AUX2 PUMP
output.
Low Voltage Connection PCB Fuse (24VAC)
–
a 2 Amp automotive style blade fuse, located on the low voltage connection
PCB, protects all 24VAC circuits within the boiler.
Control
Panel
Cover
Control
Panel
Low Voltage Connection PCB Fuse
(ATO 2A 32V Auto Blade Type)
Main PCB Fuses
(6.3A 5x20mm Slo-Blo
®
)
Zone Outputs/AUX2 Fuses
(3AG 5A 250 Slo-Blo
®
)
Zone Controller Fuses
(2A 5x20mm Slo-Blo
®
)
Service Switch
