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© 2008 Aqua-Hot
®
375-D Hydronic Heating System Installation Manual Rev. A
section 9: Power source
C.
Reference Appendix B with the total amps and
length of wire to determine the necessary wire
gauge. For example, an Aqua-Hot 375-D heater
with six Aqua-Hot Cozy heat exchangers ten feet
from the vehicle’s battery would require a 6-gauge
wire.
NOTE:
The distance for the length of wire must be doubled
when referencing the chart in Appendix B as the
lengths given are from the source to the device and
back to the source.
2.
Run and connect two wires –– one red (+) wire and
one black (-) wire (power and ground), from the ve-
hicle’s battery to the Aqua-Hot’s 12 Volt-DC terminal
block through the corresponding cable-clamp fitting.
Reference Appendix A and Figures 42 and 43.
3.
Follow the instructions in this section for “Installing
the Wires into the Terminal Blocks” for each 12 Volt-
DC wire.
Connecting the 120 Volt-AC Power:
1.
Follow the instructions in this section for “Installing
the Wires into the Terminal Blocks” for the 120 Volt-
AC wires.
DO NOT activate the diesel-burner until the antifreeze and
water heating solution has been added to the boiler tank
and the heating system has been completely bled of air.
Operating the Aqua-Hot without the antifreeze and water
heating solution will cause serious damage to the Aqua-
Hot’s boiler tank.
Installing the Wires into the Terminal Blocks:
1.
Loosen the cable clamps on the installed cable clamp
fittings. Reference Figure 42.
2.
Insert the wires into the terminal block access area
through the appropriate port’s cable clamp fitting and
into the proper terminal. Reference Figure 42.
3.
Secure the wires into their terminals by tightening the
corresponding screw on the terminal block.
4.
Hand-tighten the cable clamps on each of the cable-
clamp fittings.
5.
Re-install the terminal block access cover and tighten
the screws securing the cover to the Aqua-Hot.
NOTE:
All electric installations, systems, and equipment shall
comply with Article 551, Parts I and III through VI of
NFPA 70, as well as the regulation of authorities having
jurisdiction and CSA Standard B139.
Electrical connections for the Aqua-Hot 375-D heater
are made in the terminal block access area on top of
the heater. Access ports exist on either side of the
access area to better accommodate all installations.
Please note, however, that in order for the required
access cover to be installed, all ports must be used on
the same side. One port should be used for the wiring
for each terminal block (i.e., one port should contain
the 120 Volt-AC wires, one port should contain the 12
Volt-DC wires, and one port should contain the switch
panel and thermostat wires. Reference Appendix A).
Three cable-clamp fittings have been included in the
shipping kit and will be used to support the incoming
wires to the terminal blocks.
Connecting the 12 Volt-DC Power:
DO NOT
connect the 12 Volt-DC power to the Aqua-Hot if
the vehicle requires welding. Electrical welding will cause serious
damage to the diesel-burner controller.
NOTE:
Because the Aqua-Hot is designed to shut down in the
event that the DC voltage level drops too low to prop-
erly operate, it is imperative that the proper wire gauge
be determined and utilized.
Be sure to protect against accidental shorting (i.e., chas-
sis shorting) by incorporating a 30-Amp rated in-line
fuse into the power wire at the battery location. Refer-
ence Figure 43.
1.
Calculate the necessary wire gauge for the 12 Volt-DC
power and ground wires.
A.
Determine the total maximum amperage draw of
the Aqua-Hot heating system by adding the total
maximum amps of the installed heat exchangers
(consult the heat exchanger manufacturer for amp-
draw information) to the Aqua-Hot 375-D’s 26
amps.
NOTE:
Each Aqua-Hot Cozy heat exchanger draws .23 amps
of direct current.
For example, an Aqua-Hot 375-D heater with six
Aqua-Hot Cozy heat exchangers draws a total of
27.38 amps ((6 x .23) + 26).
B.
Determine the total length of wire required to
connect the terminal block to the vehicle’s battery.
Summary of Contents for 375D
Page 1: ...2008 Aqua Hot Heating Systems Inc Installation Manual...
Page 38: ...Wiring Diagram Appendix A...
Page 40: ...Wire Gauge Information Appendix B...
Page 42: ...Antifreeze Types Appendix C...
Page 44: ...Antifreeze Mixture Water Quality Recommendations Appendix D...
Page 46: ...Antifreeze Terms and Mixture Ratio Appendix E...
