Aqua-Hot 375D User manual

© 2008 Aqua-Hot Heating Systems Inc.
INSTALLATION MANUAL

© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Table of Contents
Aqua-Hot 375-D Installation Manual
Introduction............................................................................................................................................1
Section 1: Aqua-Hot Hydronic Heating System
Technical Information...........................................................................................................................2
Section 2: Aqua-Hot Installation
Installing the Mounting Tray and the Aqua-Hot ..............................................................................5
Overall Aqua-Hot Dimensions............................................................................................................6
Installing the Cable-Clamp Fittings.....................................................................................................8
Installing the Wires into the Terminal Blocks...................................................................................8
Installing the Expansion Tank .............................................................................................................9
Section 3: Hydronic Heating System
Location and Clearances.......................................................................................................................10
Mounting Requirements .......................................................................................................................10
Mounting the Heat Exchangers...........................................................................................................11
Wiring the Heat Exchangers ................................................................................................................13
Plumbing Requirements........................................................................................................................14
Plumbing the Hydronic Heating System............................................................................................15
Section 4: Thermostats
Fresh Water Tank Thermostat.............................................................................................................17
Room Thermostats................................................................................................................................18
Section 5: Domestic Water System
Domestic Water System Requirements...............................................................................................19
Domestic Water System Plumbing...................................................................................................... 19
Section 6: Switch Panel
Switch Panel Location...........................................................................................................................21
Switch Panel Mounting .........................................................................................................................21
Switch Panel Wiring...............................................................................................................................21
Section 7: Fuel System
Fuel Filter Location ...............................................................................................................................23
Fuel System Requirements ...................................................................................................................23
Fuel System Installation........................................................................................................................23
Section 8: Exhaust System
Exhaust System Requirements.............................................................................................................26
Installing the Exhaust System..............................................................................................................26
Section 9: Power Source Wiring
Connecting the 12 Volt-DC Power.....................................................................................................29

© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Table of Contents (continued)
Connecting the 120 Volt-AC Power....................................................................................................29
Installing the Wires into the Terminal Blocks...................................................................................29
Section 10: Purging the Systems
Purging the Hydronic Heating System ...............................................................................................31
Purging the System by Grounding the Zone Circulation Pumps ..................................................32
Purging the Domestic Water System ..................................................................................................32
Section 11: Initial Start-Up
Activating the Aqua-Hot.......................................................................................................................34
Appendices:
Appendix A: Wiring Diagram.............................................................................................................A-1
Appendix B: Wire Gauge Information.............................................................................................. B-1
Appendix C: Antifreeze Types............................................................................................................ C-1
Appendix D: Antifreeze Mixture Water Quality Recommendations............................................D-1
Appendix E: Antifreeze Terms and Mixture Ratio ......................................................................... E-1

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Introduction
This Installation Manual is designed to aid in the
installation process of the Aqua-Hot 375-D Hydronic
Heating System by a trained and experienced techni-
cian. The Aqua-Hot features a 12 Volt-DC powered
diesel-burner and a 120 Volt-AC, 1500 Watt electric
heating element. These two heating sources are used in
conjunction with an FDA-approved “GRAS” (Gener-
ally Recognized As Safe) propylene glycol based anti-
freeze and water heating solution in order to provide
a continuous supply of domestic hot water, interior/
fresh water tank heating, and independent interior zone
heating.
Please note that all Danger, Warning, Caution, and
Note boxes, appearing as needed throughout this
manual, must be reviewed and adhered to during the in-
stallation procedure in order to avoid potential hazards,
which could result in injury, death, product damage, or
property damage.
Should additional assistance be needed, please contact
the Product Application Department at 1-800-685-
4298, Monday through Friday, between the hours of
8:00 AM and 5:00 PM Mountain Standard Time.
Danger, Warning, Caution, and Note Boxes:
Danger, Warning, Caution, and Note boxes appear
throughout this manual as a means of alerting the
installer to important information.
In d I c a t e s t h a t p e r s o n a l I n j u r y I s l I k e l y o r I m m I n e n t .
Indicates that serious damage to the heater will occur and
personal injury is possible as well.
Indicates that damage to the heater is possible.
NOTE: Indicates information that requires special attention by
the installer.

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Aqua-Hot Hydronic Heating SystemSection 1: Aqua-Hot Hydronic Heating System
Diesel-Burner, Heat Input (Firing Rate) .............................................................59,000 BTU/hr
Diesel-Burner, Fuel Consumption (Continuous Operation) .................................................0.40 gal/hr
Heater, Voltage/Maximum Power Consumption................................................12 Volt-DC/245 watts
Electric Heating Element specications ......................................................120 Volt-AC/1500 watts
Zone Heat Circulation Pump specications...............................................(2) 12 Volt-DC/21 watts each
Numberof HeatingZones..................................................maximumof 2,plusBayHeatExchanger
DomesticWaterHeatingCapacity .......................................................... continuous/on-demand
Dimensions............................................................................16.75”H x 18”W x 29.5”L
Dry Weight ...............................................................................approximately 155 lbs.
Wet Weight ...............................................................................approximately 200 lbs.
NOTE: All vehicle installations must comply with the requirements listed in the Recreational Vehicle Industry Asso-
ciation’s (RVIA) ANSI/NFPA 1192 Handbook for Recreational Vehicle Standards. To receive a copy of this handbook
and other pertinent RVIA Standards, write to: Recreation Vehicle Industry Association, 1896 Preston White Drive, P.O.
Box 2999, Reston, VA 22090-0999, call them at [phone], or visit them online at www.rvia.org.
Figure 1

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 1: Aqua-Hot Hydronic Heating System
Figure 3
3069328
For installation only in a compartment that is completely closed o from living quarters and
accessible only from the outdoors.
The Exhaust System MUST NOT terminate beneath the vehicle or under an openable window or vent.
Combustion Air MUST BE supplied from outside the vehicle.
CAUTION: THIS APPLIANCE OPERATES ON BOTH AC AND DC POWER.
USE COPPER CONDUCTORS ONLY!
Use a 25-Amp fuse for over-current protection for the DC power supply.
Use a circuit breaker that cuts power at 20-Amps maximum for over-current protection for the
120-VAC power supply.
Mount the Heater near a bay/storage door so that the Access Cover can be easily removed for service.
WARNING: DO NOT OPERATE APPLIANCE WITH ACCESS COVERS REMOVED.
Minimum Heater Clearances:
Front - Open Access
Back - 0 inches
Top - 0 inches
Sides - 0 inches
Install in strict compliance with local codes, NFPA 1192, and the manufacturer’s instructions.
Direct Vent Appliance
245
Figure 2
Pump-1 and
Pump-2 Inlet
Ports
Diesel Fuel
Inlet/Outlet
Ports
I.D. Label
Hot Water
Outlet Port
Cold Water
Inlet Port
Terminal Block Access Area
Zone 1 and 2
Outlet Ports
Air-Release
Valve Expansion Tank
Connection

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 1: Aqua-Hot Hydronic Heating System
Figure 4
Figure 5
Motorhome Floor
Outline of
Mounting Tray
Additional Cross-Member
for Support (may be
necessary)
1.95
(Typical)
18.00
(Overall)
27.25
(Overall)
1.23
(Typical)
14.17
(Cut-Out)
18.07
(Cut-Out)
Front of Aqua-Hot
NOTE: All measurements are in inches
Motorhome Floor
Outline of
Mounting Tray
Additional Cross-Member
for Support (may be
necessary)
CUT
OUT
Outline of Aqua-Hot
Front of Aqua-Hot
Motorhome Floor
Outline
1.408
(Typical)
2.017
(Typical)
Ø .203
(Typical 6 Places)
18.129
(Overall)
27.249
(Overall)
1.240
(Typical)
1.031
(Typical)
14.095
(Cut-Out)
18.000
(Cut-Out)
15.313
(Center of Holes)
9.125
(Center
of Holes)
16.063
(Center
of Holes)
Interlock
Switch
Zone-2
Circulation Pump
Diesel-Burner
Mounting Tray
Drain Valve
Diesel-Burner
Controller
Zone-1 Relay
Zone-2 Relay
Fuse Block
NOTE: All measurements are in inches.

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 2: Aqua-Hot Installation
Installing the Mounting Tray and the Aqua-Hot:
The Aqua-Hot must be installed in a compartment that is
completely closed-off from living quarters and accessible
only from the outdoors.
1. Reference the following illustrations for mounting
information:
• Overall Aqua-Hot dimensions - Figure 7
• Mounting tray information - Figure 5
• I.D. Label noting the “Open Access”
clearance requirement for the front of the heater
- Figure 2
• Service access clearances - Figure 6
2. Cut out the required mounting tray opening. Reference
Figure 5.
3. Install the mounting tray ange into the cut-out open-
ing. Reference Figure 5.
NOTE: Be sure to complete the following when installing the
Aqua-Hot:
Inspect the area beneath the mounting location to•
insure that no structural members will interfere with
the cut-out for the mounting tray.
Verify that an adequate support system has been
•
provided for the Aqua-Hot.
Secure the mounting tray into place prior to install-•
ing the Aqua-Hot.
Remove the access cover fastener from the Aqua-•
Hot prior to installation of the Aqua-Hot into the
mounting tray.
Mount the Aqua-Hot securely into the mounting tray•
to ensure that the unit does not move or shift under
normal operating conditions.
4. Insert a #10 machine screw into each of the embossed
holes in the mounting tray (total of six required) and
tighten to secure the mounting tray to the motorhome.
5. Place the Aqua-Hot into the mounting tray. Reference
Figure 8.
NOTE: Remove the bolt securing the front of the access cover
to the mounting tray; this bolt will need to be re-in-
stalled once the total installation procedure is complete.
Remove the access cover.
0 in.
0 in.
0 in.
Open Access Motorhome Bay
6 in. Minimum
Access Cover
Figure 6

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 2: Aqua-Hot Installation
Top View
18.00
27.25
Side View
Front View
17.81
17.50
2.05
Side View
1.5 INCH
BLACK PIPE
EXHAUST
FITTING
27.25
14.35
NOTE: All measurements
are in inches.
Bottom View
1.95
(Typical)
18.00
(Overall)
27.25
(Overall)
1.23
14.17
(Cut-Out)
18.07
(Cut-Out)
Figure 7

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 2: Aqua-Hot Installation
Front of Mounting
Tray
Back of Mounting
Tray
Access Cover
Mounting Tray
Flange
1.5 inch Black
Pipe Exhaust
Fittings
Mounting Tray
Mounting Tray
Motorhome Floor
Slots
Slots
Tabs
Mounting Tray
Flange
Figure 8

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 2: Aqua-Hot Installation
Installing the Cable-Clamp Fittings:
1. Determine the port side best suited for the current ap-
plication. Reference Figure 9.
2. Remove the terminal block access cover and set aside
in a location where it will not become damaged or
scratched.
3. For each cable-clamp tting, remove the nut from the
tting, insert the tting into the port with the wire-
entry side facing away from the terminal block access
area, screw the nut onto the tting, and hand-tighten.
Reference Figure 9.
Installing the Wires into the Terminal Blocks:
NOTE: It is recommended that the wire numbers in Appendix
A be used when installing the Aqua-Hot in order to
assist with differentiating between the separate heating
zones and to aid service personnel with troubleshoot-
ing.
1. Loosen the cable clamps on the installed cable-clamp
ttings. Reference Figure 10.
2. Insert the wires into the terminal block access area
through the appropriate port’s cable clamp tting and
into the proper terminal. Reference Figure 10.
3. Secure the wires into their terminals by tightening the
corresponding screw on the terminal block.
4. Hand tighten the cable clamps on each of the cable-
clamp ttings.
5. Re-install the terminal block access cover and tighten
the screws securing the cover to the Aqua-Hot.
Figure 10
120 Volt-AC
Terminal Block
12 Volt-DC
Terminal Block
Cable-Clamp Fittings
(optional placement)
Terminal Block
for Switches,
Heat Exchanger
Fans, and
Thermostats
Cable-clamp
ttings can be
installed on either
side of the termi-
nal block access
area
Figure 9

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Overflow Tube
Hole in Motorhome’s
Bay Floor
Overflow
Tube
Overflow
Tube
Expansion Tank
Connection
Tension
Clamp
Tension
Clamp
Tension
Clamp
Section 2: Aqua-Hot Installation
Installing the Expansion Tank:
Select a mounting location that allows for easy access
and clear visibility whenever the particular storage bay
door is open.
NOTE: The top of the expansion tank should always be
mounted at least 4 inches higher than the highest point
on the Aqua-Hot’s boiler tank. Reference Figure 11.
1. Mount the expansion tank as illustrated in Figure 11.
2. Connect and clamp the overow tubing from the
Figure 11
expansion tank to the Aqua-Hot’s expansion tank con-
nection. Reference Figure 11.
NOTE: Avoid any dips and bends in the overow tubing from
the Aqua-Hot to the expansion tank as air can become
trapped in these dips and bends, preventing the expan-
sion of the heating solution from properly depositing
in the expansion tank.
3. Drill a hole in the bay oor and connect (secure with a
clamp) a long enough piece of overow tubing so that
it can be connected to the top of the expansion tank
and extend through the bay oor.

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 3: Hydronic Heating System
Location and Clearances:
• Place the heat exchangers so that even heat distribution
will be felt throughout the interior of the motorhome.
Reference Figures 14 and 17.
NOTE: For single slide-out congurations, it is usually simplest
to place a heat exchanger on the opposite side of the
motorhome pointing towards the slide-out.
•Place the heat exchangers where they will be accessible
for potential servicing and cleaning.
• Centralize and position a heat exchanger in the fresh
water storage tank plumbing bay. Reference Figure 12.
NOTE: In order to achieve the best heating results, place the
heat exchanger as close to the oor of the plumbing
bay as possible (heat will naturally rise).
• Reference Figures 12, 13, and 14 for mounting location
information.
•Reference Figure 13 for clearance information.
NOTE: An accessory device is available for the Cozy Heat Ex-
changer for the purpose of redirecting the airow from
the heat exchanger. Reference Figure 16.
Mounting Requirements:
• Sufcient ventilation (return-air) must be supplied to
each interior heat exchanger. Reference Figures 14 and
15.
NOTE: Mounting the heat exchangers without sufcient venti-
lation will severely reduce their overall heating perfor-
mance (heat output).
In order to provide sufcient ventilation, the return-
air registers must be the same size, or larger, than the
outlet-air registers.
Return-air must be supplied from the corresponding
interior heating zones.
Cozy
Cozy
Cozy
Cozy
tnorF
yzoC
Cozy
Return-Air
Return-Air
Return-Air
Indicates generally recommended
mounting locations for the Cozy
Heat Exchangers
Interior Zone Heating/Heat Exchanger Layout
Figure 14
INTERIOR WALL/CABINET WALL
4 inch Minimum
Clearance
Required
Figure 12
Heat Output
Cold-Air Return
Optional
Vent
Fresh Water
Storage Tank
Figure 13

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
NOTE: Please note that a return-air register may not be re-
quired; however, adequate return-air must be provided
to each particular heat exchanger. This means that the
total cross-sectional area of the return-air opening must
be equal to or greater than the cross-sectional area of
the hot-air outlet opening of the heat exchanger.
Section 3: Hydronic Heating System
Living Room
Heat Exchanger
Living Room
Heat Exchanger
Kitchen
Heat Exchanger
Bathroom
Heat Exchanger
Fresh Water
Tank Heat
Exchanger
Aqua-Hot 375-D
Heating System
Heating Loop 1
Kitchen and Living Room
Heating Zone
Heating Loop 2
Bathroom, Bedroom,
and Fresh Water Tank Bay
Heating Zones
Bedroom
Heat Exchanger
Generalized Motorhome Heating System Floor Plan
Figure 17
Mounting the Heat Exchangers:
1. Cut out a 2.5”H x 10”W opening for each heat ex-
changer outlet and cold-air return register. Reference
Figure 15.
2. Mount each heat exchanger permanently into place.
3. Install the hot-air outlet and cold-air return registers.
Reference Figure 15.
Figure 16
HEAT
EXCHANGER
HOT-AIR
OUTLET BASE-BOARD /TOE-KICK AREA
CABINET/COUCH
REGISTER
COLD-AIR
REGISTER
REGISTER
Figure 15

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 3: Hydronic Heating System
Vertical Mount
Horizontal Mount Mounting Tab
Figure 18
3.50 in.
5.50 in.
1.06 in.
0.38 in.
2.81 in.
6.50 in.
10.50 in.
13.69 in.
6.44 in.
13.06 in.
14.44 in.
Figure 19

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 3: Hydronic Heating System
Wiring the Heat Exchangers:
1. Within each heating zone, run an 18-gauge wire - black
for negative, from each heat exchanger’s black wire to
the chassis ground source. Reference Figure 21.
2. Within each heating zone, run one 18-gauge - red for
positive, from the heat exchanger farthest from the
Aqua-Hot past all other heat exchangers in that zone to
the terminal block.
3. Within each heating zone, connect the red heat exchang-
er wires to the 18-gauge wire ran in step 2. Be sure
that the wire end (farthest from the Aqua-Hot) is either
attached to the last heat exchanger or covered to prevent
additional connections.
4. Attach each zone wire ran in step 2 to the Aqua-Hot
terminal block - position F1 for zone 1 and position F2
for zone 2. Reference Figure 20. Tighten the screw in
the terminal to secure the wire in place.
5. Label the wires indicating the heating zone they pertain
to (e.g., Living Room, etc.)
+ (Positive) Red Wires
To Aqua-Hot’s Terminal
Block
- (Ground) Black Wires
To a chassis ground source
Mounting Tab
3.63 in.
13.06 in.
6.44 in.
14.44 in.
Figure 21
Figure 20
Terminal for Heating
Zone 1’s positive heat
exchanger wire (F1).
Terminal for Heating
Zone 2’s positive heat
exchanger wire (F2).
Terminal Block for Switches, Heat
Exchanger Fans, and Thermostats

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Living Room
Heat Exchanger
Fresh Water Tank
Heat Exchanger
Bathroom Heat
Exchanger
Bedroom Heat
Exchanger
Living Room
Heat Exchanger
Kitchen Heat
Exchanger
Heating Loop #1
Heating Loop #2
Outgoing Plumbing Lines Incoming Plumbing Lines
Heating Zone #1
Heating Zone #2 Heating Zone #3
Section 3: Hydronic Heating System
Plumbing Requirements:
Once all heat exchangers have been mounted, formu-
late a plan for the routing of the plumbing lines from
each heating zone to the Aqua-Hot.
All plumbing lines should be laid as at as possible,
and any extreme rises in height should be avoided to
eliminate any potential air-traps.
The kitchen and living room heat exchangers (typically
three) must be plumbed together in-series on “Heating
Loop 1.” Reference Figure 22.
The fresh water tank, bedroom, and bathroom heat
exchangers (typically 3) must be plumbed together in-
series on “Heating Loop 2.” Reference Figure 22.
Use 5/8 inch I.D. (Inside Diameter) plumbing lines for
both heating loops.
Use wide-sweeping elbows or “bend supports” when-
ever the plumbing lines may be susceptible to kinking
(i.e., 90° bends).
Figure 22

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 3: Hydronic Heating System
Plumbing the Hydronic Heating System:
1. Lay out the plumbing lines for all heat exchangers.
2. Label each line with the heating loop number and des-
ignate as an inlet or an outlet line.
NOTE: Run all plumbing lines in areas where they cannot be
pinched off or damaged under normal operating condi-
tions.
Be sure to secure all lines where necessary and apply
protective shielding in areas where chang may occur.
Rubber Coated/Closed-Type clamps are recommended
when securing the plumbing lines.
3. Connect and clamp the outlet line from the heater to
the lowest port on the closest heat exchanger for both
heating loops. Reference Figure 23. Then, connect
each additional heat exchanger in the same arrangement
(low to high).
4. Connect and clamp the inlet line from the heater to the
highest port on the last heat exchanger for both heating
loops. Reference Figure 23.
NOTE: Reference Figure 24 for visual instructions on connect-
ing PEX-type tubing to each heat exchanger.
Plumbing heat exchangers in this manner will allow
air to escape naturally. If air is trapped in any heat ex-
changer, it will signicantly reduce the heat exchanger’s
overall heating performance (heat output).
5. Connect and tighten all interior plumbing lines, outlet
and inlet, to the Aqua-Hot’s appropriate heating loop
ports. Reference Figures 22 and 25.
NOTE: The inlet and outlet plumbing lines can be installed
with a straight tting or an elbow tting.
Mounting
Bracket
Mounting
Bracket
Cozy Heat Exchanger
(Rear View)
Outlet Port
(Highest Port)
Inlet Port
(Lowest Port)
Figure 23

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
Section 3: Hydronic Heating System
Constant Tension
Clamps
Pex
Insert
Pex
Insert
Outlet
Inlet
5/8 inch I.D.
3/4 inch O.D.
5/8 inch I.D.
3/4 inch O.D.
Automotive Type Rubber
Heater-Hose Coupler
(3/4 inch I.D.)
Automotive Type Rubber
Heater-Hose Coupler
(3/4 inch I.D.)
PEX Plumbing Line
PEX Plumbing Line
3/4 in. Rubber
Coupler
3/4 in. Rubber
Coupler
Figure 24
Inlet Heating
Loop Ports
(with installed barb
fittings)
Outlet Heating
Loop Ports
(with installed barb
fittings)
Inlet Heating
Loop Ports
(with installed
compression fittings)
Outlet Heating
Loop Ports
(with installed
compression fittings)
Barbed Fitting
Heater Hose
Pex Tubing
Pex Tubing
Pex Insert
Compression Fitting
Pex Insert
Single-Wire Hose Clamp
Constant Tension Band Clamp
Figure 25

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© 2008 Aqua-Hot®375-D Hydronic Heating System Installation Manual Rev. A
2. Once the thermostat has been completely wired,
permanently mount the thermostat in place. Reference
Figure 26.
Fresh Water Tank Thermostat Wiring:
1. Run two 18-gauge wires from the terminal block (posi-
tions T3 and P2) to the fresh-water tank thermostat.
2. Splice the wire from position T3 on the Aqua-Hot’s ter-
minal block to the fresh water tank thermostat’s black
wire.
3. Run an 18-gauge wire from the positive (red) wire on
the fresh water bay heat exchanger to the fresh water
tank thermostat.
4. Both the wire from the P2 position on the Aqua-Hot’s
terminal block and the wire connected to the positive
wire on the fresh water tank bay heat exchanger will
need to be connected to the fresh water tank thermo-
stat’s blue wire.
Section 4: Thermostats
Fresh Water Tank Thermostat Locations:
Select a location that will ensure even-heat distribution
throughout the fresh water storage tank bay com-
partment 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). Refer-
ence Figure 26.
Do not mount the thermostat bulb in a drafty area.
The selected mounting location should allow for easy
operator access.
Avoid mounting the fresh water tank thermostat’s bulb
too close to the bay heat exchanger.
Fresh Water Tank Thermostat Mounting:
1. Select a location for the thermostat bulb in the fresh
water storage tank bay compartment.
Black wire to T3
position on
Terminal Block Blue wire spliced to (+)
Heat Exchanger wire
Blue wire spliced
to P2 position on
Terminal Block
Fresh Water Tank Thermostat
Terminal Block
Heat Exchanger
Figure 27
Figure 26
6
0 1
0 2
0
3
0
0
0
F
Bulb
Mounting
Tabs
Black Wire
Blue Wire