Domestic Water System
Domestic Water System
©Aqua-Hot®
400D Installation Manual
Rev 220504
©Aqua-Hot®
400D Installation Manual
Rev 220504
p. 25
p. 24
Plumbing the Domestic Water System
The Aqua-Hot is also able to provide domestic hot water
while the boiler tank is up at operating temperature. Activate
the Diesel burner to provide adequate heat for hot water needs.
The electric element will provide light duty hot water.
The tempering valve is integrated into the cabinet of the
Aqua-Hot, and is set upon departure from the Aqua-Hot factory.
So long as the tempering valve is not modified, it will provide
hot, non-scalding water. The Aqua-Hot is required to have a
pressure relief valve that releases excessive pressure in the
domestic water system.
Instructions
1. Connect a domestic water plumbing line from the domestic
water demand pump to the cold water inlet port (blue PEX)
on the Aqua-Hot.
2. Connect a domestic water plumbing line from the Aqua-
Hot’s hot water outlet port (red PEX) to the hot water
system’s distribution lines.
Fresh Water Tank Thermostat
Select a location that will ensure even heat distribution
throughout the fresh water storage bay compartment in order to
prevent the domestic water and plumbing system from freezing.
Typically, only the bulb of the thermostat needs to be
physically mounted in the area requiring heat (usually in close
proximity to the domestic water pump). Reference Figure 47.
• Do not mount the thermostat bulb in a drafty area or
along the ceiling of the bay.
• The selected mounting location should allow for easy
access and should be as low in the bay area as possible.
• Avoid mounting the fresh water tank thermostat’s bulb
too close to the bay heat exchanger.
• Aqua-Hot recommends using Heating Zone 4 for the
Bay thermostat, as Zone Circulation Pump 2 is for Zone
4. However, you can wire to which ever zone of your
preference.
Fresh Water Tank Thermostat Mounting
1. Select a location for the thermostat bulb in the fresh
water storage tank bay compartment.
2. Once the thermostat has been completely wired,
permanently mount the thermostat in place.
Fresh Water Tank Thermostat Wiring
1. Run two 18-gauge wires from the thermostat’s mounting
location to the Aqua-Hot’s Reporter J1 & J9 Pin.
2. Insert the positive wire (#82) to the J9-5 Pin on the
Reporter, and insert the ground wire (#83) to J1-8 Pin.
3. Connect both wires to the appropriate leads of the
thermostat.
Room Thermostat Locations
Select a location that will ensure even heat throughout each
heating zone. Place each room thermostat at approximately
chest level, if applicable.
The selected location should prevent the thermostat from
being affected by the following.
• Drafts or dead spots behind doors and in corners.
• Hot or cold air ducts.
• Radiant heat from sun or appliances.
• Heat from concealed pipes and chimneys.
• Unheated or uncooled areas such as an outside wall
behind the thermostat.
Room Thermostat Mounting
1. Select a location for the thermostat in the coach.
2. Once the thermostat has been completely wired,
permanently mount the thermostat in place. Be sure
the thermostats are turned OFF.
Room Thermostat Wiring
1. Run two 18-gauge wires from each room thermostat
mounting location to the Aqua-Hot’s Reporter J1 & J9
Pin.
2. Insert the positive wire to the J9 Pin on the Reporter,
and insert the ground wire to J1 Pin.
3. Connect both wires to the appropriate leads of the
thermostat. Reference the wiring schematic on Page
49.
Figure 47
Mounting Tab
Bulb
Thermostats
Capillary Tube
Bay Thermostat Rear View
Terminals
Figure 46
To Hot Water Faucets
Tempered
Domestic Hot Water
Fresh Water
Storage Tank
Cold Water Faucets
Demand Pump
Figure 45
AT
AT
AT
Indicates options for mounting
an Accumulator Tank.
AT
Bay Thermostat
