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Wiring Heat Exchangers
Wiring the Heat Exchangers
This section will explain in detail how to wire the heat
exchangers for optimal functionality. Do not deviate from these
guidelines. If a deviation is required, contact Aqua-Hot Heating
Systems prior to installing these exchangers for express
permission to proceed with modifications.
Instructions
1. Wire each heat exchanger (in a thermostatic zone) in
parallel to one another as shown in Figure 67.
2. Wire each heat exchanger independently to the J7 plug of
the unit controller.
NOTE: Quiet-mode functionality of the new controller requires
that the heat exchangers be wired directly into the controller.
3. Pin-out information is shown below.
Thermostatic
Supply (+) Pin
Ground (-) Pin
Zone Number
Number
Number
1
J7-1
J7-4
2
J7-2
J7-5
3
J7-3
J7-6
J7 Wire insertion view shown
7
8
9
4
5
6
1
2
3
Figure 65
Connector Part Numbers
Part Number
Manufacturer
Description
1-480706-0
TE Connectivity
J7 Plug Housing
350550-1
TE Connectivity
J7 Socket Terminal
J7 Socket Terminal
Figure 66
p. 30
©Aqua-Hot®
125-GN1 Installation Manual REV 220427
J7 Mating Plug
Figure 67
NOTE: The 125GN can have up to 3 individual, thermostatic
heating zones. The heat exchangers in different zones are
wired to a different set of pins of the J7 plug.
Plumbing the Heating Zone
The following guidelines should be used when planning the
coolant loop for the heating zone. The 125GN requires a single
fluid zone. The order of the heat exchangers should consider
priority on the loop. Failure to adhere to these installation
principles can hinder the operation of the heat exchangers.
•
All plumbing should be installed as flatly as possible.
•
Extreme rises in height should be avoided to avoid any
potential air traps.
•
Use ⅝" ID plumbing lines, ¾" SAE J20 type coolant hose,
heater hose, or PEX tubing for the single heating loop.
•
Use wide-sweeping elbows or "bend supports" whenever
the plumbing lines may be susceptible to kinking.
•
Plumbing lines should be run in areas where there is no
reasonable possibility that they can be pinched off or
damaged under normal operating conditions.
•
Secure all lines where necessary and apply protective
shielding in areas where chafing may occur.
•
Rubber coated/closed-type clamps are recommended
when securing the plumbing lines.
•
Inlet and outlet plumbing lines can be installed with a
straight fitting or an elbow.
Instructions
1. Layout the plumbing lines for all heat exchangers (see the
example in Figure 71).
2. Label each line and designate as an outlet or an inlet line.
3. Connect and clamp the outlet line from the heater to the
lowest port (inlet port).
4. Connect and clamp a line from the first heat exchanger's
highest port, and connect the other end to the next heat
exchanger's lowest point.
5. Connect each additional heat exchanger in the same
arrangement.
6. Connect and clamp the inlet line from the heater to the
highest port on the last heat exchanger to complete the
heating loop.
Zone Return
Zone Supply
Figure 70
©Aqua-Hot®
125-GN1 Installation Manual REV 220427
Plumbing the Heating Loop
Outlet
Hose
¾"
PEX Insert
Clamps
Coupler
Inlet
Figure 68
Mounting
Tabs (both
sides)
Outlet
Inlet
Figure 69
NOTE: This diagram below is simply a reference to show the
layout and flow of the plumbing to and from heat exchangers.
Placement and quantity may vary depending on the RV.
Cozy #1
Cozy #2
Cozy #3
Aqua-Hot
Heating System
Figure 71
p. 31
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