12
Servicing should only be performed by a Qualified Service Agent
HEAT EXCHANGER ASSEMBLY
The heat exchanger transfers heat from the hot flue gases to the heating system’s water. Combustion products including flue gas
condensate, which are formed in the heat exchanger are evacuated. The heat exchanger includes the following interfaces:
•
2x Burner doors
• Flue gas outlet connection
• Water inlet and outlet connection
• Condensate connection
•
Bushes for sensor
Heat from the hot flue gases is transferred to the heating water through a spiral tube made from stainless steel. The heat exchanger
is equipped with an evacuation for the combustion products at the back side. The burner doors should integrate a double tightness:
a gasket insuring a thermal protection and a gasket tight to the condensates and flue gas. The burner door should be in contact
with the front panel of the heat exchanger in order to limit the risk of leakage from combustion products in case the gaskets are
incorrectly reinstalled. Bolts on the front of the boiler/water heater can withstand forces resulting from the weight of the front panel
and assembled parts (burner door, fan, gas valve, venturi, air-gas sleeve). Maximum nuts torque for assembling the burner door is
3.7 ft.lb.
Minimum working pressure rated capacity is 14.5 PSI (100 kPa) and the minimum water volume is 1.1 GPM (4.2 LPM) per tube.
Under these conditions the maximum temperature difference between the outgoing and returning water is 80°F (26.7°C). With a
Maximum Allowable Working Pressure of 160 PSI (1103.2 kPa), the exchanger’s hot water circuit system does not tolerate long-
lasting leaks or deformations. Minimum water pressure for a closed-loop system must not be lower than 14.5 PSI (100 kPa). Normal
Heating circuit water temperature is 41°F – 203°F (5°C - 85°C).
The ambient temperature around the product must not exceed 140°F (60°C) and the ambient relative humidity (RH) can vary from
0% to a maximum of 90%. In the extreme case of a safety component malfunctioning and causing the system to overheat to a
temperature higher than 203°F (85°C) (closed system), the water temperature shall not exceed 210°F (99°C) referring to the ASME
Code Section IV for austenitic stainless steel materials. The maximum surface temperatures for the casing, back panel and front
panel must not exceed 302°F (150°C).
The Trio ASME “H” Heat Exchangers are equipped with 2 water male connections with NPT threading, according to the ANSI/ASME
B1.20.1 standard, which are dimensioned according to the capacity of the heat exchanger. A female NPT 1/8” threaded connection
type, according to the ANSI/ASME B1.20.1 standard, is available on the water flow and on the water return header of each stage
in order to receive some NTC sensors able to control the water flow and return temperature and/or to use its as a limiter and safety
thermostat.
FIGURE 5. HEAT EXCHANGER ASSEMBLY
Summary of Contents for 100 Series
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