© 2008 Aqua-Hot
®
450-DE/DM Hydronic Heating System Installation Manual
Section 10: Purging the System
9.
Check the Aqua-Hot’s expansion tank and top it off to
the cold level mark with the 50/50 antifreeze and water
mixture, if necessary.
10.
Ensure that each circulation pump’s wiring has been
returned to its original configuration.
Reference Figure 50.
Verify that the domestic water tank contains fresh water prior to
bleeding the fresh water system.
Purging the Domestic Water System:
1.
Ensure that the vehicle’s domestic water pump has 12
Volt-DC power, then activate it by opening each hot
water faucet, one at a time, and running the water until
all air is purged from the domestic water system.
2.
Once the domestic water system is completely bled,
check for leaks in the domestic water system.
Activating the Aqua-Hot:
1.
Reinstall the Aqua-Hot’s main access cover and the fas-
tener, which secures the front of the Aqua-Hot’s access
cover to the mounting tray
The main access cover must be installed prior to opera-
tion; a safety switch exists, which will prevent the Aqua-
Hot from operating whenever the main access cover is
not properly installed.
2.
Move the diesel-burner switch to the
ON
position for
approximately ten seconds
ONLY
, then switch it
OFF.
NOTE:
This procedure will purge the diesel-burner’s fuel sys-
tem by allowing the heater’s fuel pump to complete its
normal 30-150 second shutdown/purge cycle.
3.
After the purge cycle has ended, repeat once more.
4.
Move the diesel-burner switch to the
ON
position and
leave it on in order to activate the diesel-burner.
NOTE:
It will take approximately 10 seconds before the diesel-
burner will ignite and exhaust can be heard exiting the
heater.
Allow approximately 10-20 minutes for the Aqua-Hot
to reach normal operating temperature (approximately
190°F).
5.
Move the Aqua-Hot’s electric element switch to the
ON
position in order to supply 120 Volt-AC power to
the electric heating element.
NOTE:
Both the 12 Volt-DC powered diesel-burner and the
electric heating element are thermostatically controlled.
Either or both heating sources will automatically main-
tain the temperature of the boiler tank’s antifreeze and
water heating solution depending on the heating source
activated at the interior switch panel.
The Aqua-Hot is now ready for normal operation and use.
— Page 37 —
Summary of Contents for 450-DE Series
Page 1: ...Installation Manual 2008 Aqua Hot Heating Systems Inc...
Page 43: ...Appendix B Appendix B Wire Gauge Information...
Page 45: ...Appendix C Appendix C Electronic Controller Features...
Page 48: ...Appendix D Appendix D Antifreeze Types...
Page 50: ...Appendix E Appendix E Antifreeze Mixture Water Quality Recommendations...
Page 52: ...Appendix F Appendix F Antifreeze Terms and Mixture Ratio...
