Component Description

1.Front access door:

Provides access to the gas train, burner controllers and the heat exchanger.

2.Air Filter Box:

Allows for the connection of the PVC air intake pipe to the boiler through a standard PVC adapter. It uses a filter to prevent dust and debris from entering the boiler.

3.Automatic air vents:

Designed to remove trapped air from the heat exchanger coils.

4.Blowers:

The blowers pull in air and gas through the venturis. Air and gas mix inside the venturi and are pushed into the burners, where they burn inside the combustion chamber.

5.Boiler inlet temperature sensors

These sensors monitor system return water temperature.

6.Boiler outlet temperature sensors/High Limits

These sensors monitor boiler outlet water temperature. The boiler modulates based on the Lead Lag Sensor connected to the tank.

7.Burners

Made with metal fiber and stainless steel construction, the burners use pre-mixed air and gas and provide a wide range of firing rates.

8.Condensate Trap

Disposes the condensate produced from heat exchanger and houses a switch that detects in case of blockage.

9.Control modules

The control modules respond to internal and external signals and control the blowers, gas valves, and pumps to meet the heating demand.

10.Touch Screen Display

Digital controls with touch screen technology and full color display.

11.Sight glass

The quartz sight glass provides a view of the flame for inspection purposes.

12.Flame sensors

Used by the control module to detect the presence of burner flame.

13.Flap valves

Prevents recirculation of flue products when only one burner is running.

14.Flue gas sensors (not visible)

These sensors monitor the flue gas exit temperature. The control modules will modulate and shut down the boiler if the flue gas temperature gets too hot. This protects the flue pipe from overheating.

15.Flue pipe adapter (not visible)

Allows for the connection of the PVC vent pipe system to the boiler.

16.Gas shutoff valves (Internal unit)

Manual valves used to isolate the gas valves from the burners.

17.Main gas shutoff valve (External unit)

Manual valve used to isolate the boiler from the gas supply.

18.Automatic modulating gas valve

The gas valve with the addition of venturi and blower are used for modulating premix appliances.

19.Heat exchanger access covers

Allows access to the combustion side of the heat exchanger coils.

20.High gas pressure switch

Switch provided to detect excessive supply gas pressure.

21. Spark Igniter

Provides direct spark for igniting the burners.

22.Boiler power supply terminals (not visible)

The main power to the boiler is supplied through the terminals housed inside the high voltage junction box.

23.Low gas pressure switch

Switch provided to detect low gas supply pressure.

24.High voltage connection box

This box has terminals for connecting the main power supply (120V) to the boiler and outputs power supply (120V) for the pumps from the boiler control. This box has terminals for low voltage devices such as condensate trap and flow switch.

25.Sensors/Communication Box

Connects sensors to tank sensor/header sensor and external connections to building managements systems through MODBUS.

26.Low water cutoff board and sensor probe (LWCO)

Device used to ensure adequate water is supplied to the boiler. In the event of inadequate water levels, LWCO will ensure boiler shut down. LWCO board is connected to the electronic panel, whereas the sensor probe is connected to the heat exchanger.

27.Main power supply switch

Turns 120 VAC ON/OFF to the boiler.

28.Pump relay

The pump relays are used tfor providing power to the XW Boiler models.

29.Pressure relief valve

Protects the heat exchangers from an over pressure condition. The relief valve will be set at particular PSI, depending on models.

30.Reset switch (optional) (not visible) Reset switch for the low water cutoff.

31.Stainless steel heat exchangers

Allows system water to flow through specially designed coils.

32.Venturi

The venturi is a gas/air mixing unit that allows modulation of a premix burner with constant gas/air ratio.

33.Water inlet

Water connection that return water from the system to the heat exchangers.

34.Water outlets

A NPT water connection that supplies hot water to the system.

35.Enable/Disable Switch

This is an emergency boiler turn off switch which disconnects the interlock voltage to the control board, hence turning off the power supply to the gas valves. Do not use this switch for turning off the boiler, this should be done from the touch screen display, using the Operational Switch on the Lead Lag screen.

36.Vent outlet

Provides an outlet for combustion gases to outdoor.

3400, 1700, 2000, 2600 specifications

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