Fluid Circulation Pump
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 90
Extreme Cold Weather Operation
120V AC Electric Element
Please note that the 120V AC Electric Heating Element is the
Aqua-Hot’s
secondary heat source for heating both the interior
and/or the domestic hot water during low heating demand
situations (such as when moderate ambient temperatures exist
and/or when there is a low demand for domestic hot water).
If the 120V AC Electric Heating Element is not providing enough
heat, turn the diesel burner ON in conjunction with the 120V AC
Electric Heating Element.
When storing the motor home: not winterizing the Aqua-Hot when
freezing temperatures are present will result in serious damage to
the Aqua-Hot’s Domestic Water Heating System� Also, be sure to use
a FDA-Approved “GRAS” rated antifreeze for winterization�
NOTE:
The Aqua-Hot can continue to be used for interior
zone heating once the domestic water heating system has
been drained and winterized.
Diesel Burner
If the Diesel Burner fails to operate:
•
Determine if the diesel fuel in the motor home is
winter or summer fuel
•
Verify that the diesel fuel is liquid and not jelled
•
Make sure the electrodes are properly adjusted
•
Determine when the last annual service was
performed
•
Check the LCD screen for any faults (Figure 159)
Things to Check for Lack of Interior Heat:
1. Diesel burner must be on
2. Diesel burner operating properly
3. Antifreeze concentration in the boiler tank must be between
30-50%
4. Heating system must be properly installed according to the
250-D03 Installation manual
•
At least 5 heat exchangers installed in the interior
of the RV
•
Must be cold air returns installed for every heat
exchanger (reference Figure 161)
•
Heat exchangers should be mounted as close to
the hot air outlet grill as possible (reference Figure
160)
Figure 159
Figure 161
Cold Weather Operation
Figure 160
