Thermon HELLFIRE 400, Инструкция по установке, эксплуатации и обслуживанию

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5. Conductor Sizing
5.1 Using the following table to aid in the selection of the appropriate size conductors between the heater and
service.
Table 1 – Conductor Sizing
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Wire Size
#10 #8 #6 #4 #2
Maximum Distance
2,3
m ft m ft m ft m ft m ft
240 1 7.5 20 213 698 339 1110 538 1764 855 2806 1360 4462
208 3 7.3 15 320 1048 508 1668 808 2650 1285 4215 2043 6702
440 3 3.6 15 1430 4691 2275 7646 3616 11861 5750 18863 9144 29993
575 3 3 15 2442 8011 3886 12748 6176 20257 9821 32214 15616 51222
1
As per Canadian Electrical Code, Part 1.
2
Assumed voltage drop of 5%.
3
Allowable voltage drop to be determined by local authority.
6. Local Safety Grounding
6.1 The service ground electrically grounds the
heater. If a local safety ground is required, drive
in at least one ground rod and connect it with a
suitably sized stranded copper conductor, of at
least #8 AWG, to one of the leveling leg bolts.
7. Signal and Communications Connections
7.1
Use the 1/2” conduit knockout, or punch a
suitable size hole for the signal cable.
7.2 All signal and communications connections
are made to the 1/4” AAR control and indicate
terminal block. The terminals are labeled A1 to
A12.
Table 1 – Terminals
Terminals Label Description
A1 - A2 REMOTE START A contact closure across these
terminals starts the heater when
the heater is in REMOTE RTC mode.
A3 - A4 RUN Dry contact closes to provide a run
indication.
A5 - A6 ALARM Dry contact closes to provide
alarm indication.
A7 - A8 FORCE OFF Default is closed. If FORCE OFF
function is desired, remove
shorting link and replace with
customer supplied relay contact.
Open contact disables heater.
A9 - A10 TANK VALVE These terminals are intended
to operate a 120Vac gas supply
solenoid shut off valve. They
energize when the motor contact
closes.
A11 RS-485 (+) Communications, RS-485 positive
terminal.
A12 RS-485 (-) Communications, RS-485 negative
terminal.