Airxcel Aqua-Hot 200 Series, Руководство по обслуживанию, Страница: 91 / 105

Fluid Circulation Pump
©Aqua-Hot®
250-D03 Diesel Series Service Manual REV 220302
p. 91
Fill and Purge Procedure
Figure 163
Ensure that the expansion tube is connected to both the
expansion bottle and to the Aqua-Hot� Also ensure that the
overflow hose is connected to the top port on the expansion
bottle and is allowed to flow out of the coach through the
floor of the bay as shown below.
Only Propylene Glycol based “boiler” antifreeze deemed
“GRAS” by the FDA shall be used in the Aqua-Hot’s hydronic
heating system, Failure to use approved antifreeze could
cause serious injury or death.
4. Activate the fluid transfer pump and begin filling the Aqua-
Hot through the fill valve.
5. When the fluid level reaches the cold mark on the expansion
bottle, deactivate the fluid pump.
6. Close the fill valve and disconnect the pump.
7. Reattach the access cover.
8. Turn on the burner at the interior control panel and set the
thermostat to its maximum temperature to allow for interior
heating. Let the Aqua-Hot run for at least 20 minutes to
ensure that any air in the heating loop has been purged. If
necessary, top off the propylene glycol solution at the fluid
expansion bottle.
Filling and Purging the Aqua-Hot 250-D03
Before the first activation of the Aqua-Hot, fill the unit with
antifreeze and water heating solution. Without the solution
present, the Aqua-Hot will not operate. Follow the directions
below to fill and purge the Aqua-Hot.
A 50/50 mixture of “GRAS” (Generally Recognized as Safe)
approved propylene glycol antifreeze and distilled or de-
ionized water is recommended. The mixture may be modified
to provide the most adequate freezing, boiling, and rust/
anti-corrosive protection. Reference pages 102-103 for more
information about antifreeze.
Procedure:
1. Locate the fill valve at the zone port outlet (Figure 163).
2. Make a ½” NPT connection from the propylene glycol
source to the fill valve.
3. Remove the access cover and locate the 3-way valve in the
Aqua-Hot. Ensure that the sight glass is oriented as shown
below. Reference Page 7, Figure 3 (Item #4) for the 3-Way
Valve location.
Figure 162
Sight Glass should
be horizontal
NOTE: If the sight glass is not oriented in this way while the
unit is cold, apply power to the main harness connection and
the valve will return to horizontal.