1. Low Voltage Wiring Terminal
Up front and easy to get to. Makes sensor wiring and
BMS wiring simple and clean.
2. On Board Diagnostic Center
Factory-mounted standard equipment. Gives
relevant service feedback as well as possible
solutions to clear the fault. All in plain english, no
cryptic codes to decipher. The control also stores up
to 16 fault codes in its history file for the service
technician to review.
3. TempTracker Mod Controller
Standard equipment on the XTherm. This factory-
mounted multi-function control delivers precise
temperature control with selectable mode displays
that are easy to access and read.
4. Combustion Air Fan
Cast aluminum, non-sparking construction. The state
of the art variable-speed fan is controlled by the
TempTracker Mod and works in smooth harmony
with the main gas valve.
5. Dungs Gas Valve
The XTherm uses a state-of-the-art main gas valve
manufactured in Germany. This precision gas valve
works in perfect unison with the combustion air fan.
The result is silky smooth light-offs.
6. Flow Switch
Monitors water flow and provides safe shut down if
water flow drops below the minimum required.
7. Vent Pressure Switch
Monitors vent pressure and provides safe shut down
if back pressure is excessive.
8. Gas Inlet
The XTherm will operate at 100% full rate with gas
pressures as low as 4.0”w.c.
9. Water Outlet
10. Heater Pump
Sometimes referred to as the primary pump. This
fixed speed pump keeps flow constant through the
primary heat exchanger.
11. Water Inlet
The XTherm can accept 50°F continuous inlet water
temperature.
12. Cold Water Run Pump
The XTherm comes factory equipped with a built in
Cold Water Run system. This advanced water control
system keeps the inlet water temperature to the
primary heat exchanger above 120°F, regardless of
the incoming water temperature. It constantly self
adjusts and regulates the incoming water flow while
still maintaining a constant
Δ
T in the heat
exchanger.
13. Flue Outlet
The stainless steel flue outlet is compatible with
AL29-4C. PVC or CPVC vent material may be used in
conjunction with the D-32 vent option on the
XTherm. Dramatically cut your installation costs by
using these non-metallic vent materials.
14. Stainless Steel Secondary Heat Exchanger
Recovers waste heat to boost efficiency up to 97%.
The XTherm utilizes a separate high-grade stainless
steel heat exchanger. This allows the corrosive
combustion condensate to be collected safely
without damaging the heater. There is a condensate
disposal connection on the rear of the heater. The
XTherm is also equipped with a condensate switch
that will sense a blocked condensate drain, which
protects the heater.
15. Vertical Primary Heat Exchanger
Cylindrical, multi-pass heat exchanger captures all
radiant energy, eliminating the need for heavy
refractory.
16. Drain Valve
One of two drain valves located at the bottom of the
heat exchanger. A third drain valve is located on the
secondary heat exchanger. This allows for complete
winterizing and drainage of the heater.
17. Viewing Port
Allows for easy burner inspection.
18. Weather-Proof Jacket
Heavy gauge galvanized steel with a UV-resistant
Polytuf powder coat is impervious to weather and
corrosion. The Polytuf coating passes the 1000 hour
salt spray test (ASTM B117).
3
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