Lochinvar 400-801 Manuel D’Utilisation

 

 

Allows system water to fl ow through specially designed 

 

coils for maximum heat transfer, while providing protection 

 against 

fl ue gas corrosion. The coils are encased in a jacket that 

 

contains the combustion process.

 

Allows access to the combustion side of the heat exchanger 

 coils.

 

The blower pulls in air and gas through the venturi (item 5).  

 

Air and gas mix inside the blower and are pushed into the 

 

burner, where they burn inside the combustion chamber. 

 

The gas valve senses the negative pressure created by the 

 

blower, allowing gas to fl ow only if the gas valve is powered and 

 

combustion air is fl owing.  

 

The venturi controls air and gas fl ow into the burner.  

 

This sensor monitors the fl ue gas exit temperature. The 

 

control module will modulate and shut down the boiler if the 

 

fl ue gas temperature gets too hot. This protects the fl ue pipe from 

 overheating.

 

This sensor monitors boiler outlet water temperature (system 

 

supply). If selected as the controlling sensor, the control 

 

module adjusts boiler fi ring rate so the outlet temperature is 

 correct.

 

This sensor monitors return water temperature (system 

 

return). If selected as the controlling sensor, the control 

 

module adjusts the boiler fi ring rate so the inlet temperature is 

 correct.

 

Monitors the outlet temperature of the boiler as well as the 

 

system water pressure.

 

The electronic display consists of 4 buttons, a navigation dial 

 

and a multiple line liquid crystal display. 

Factory-supplied components for complete venting 

 system. 

 

Made with metal fi ber and stainless steel construction, the 

 

burner uses pre-mixed air and gas and provides a wide range of 

 

fi ring rates.

 

A 1-1/2" or 2" NPT (depending on the model) water 

 

connection that supplies hot water to the system.

 

A 1-1/2" or 2" NPT (depending on the model) water connection 

 

that returns water from the system to the heat exchanger.

 

Threaded pipe connection of 1".  This pipe should be connected 

 

to the incoming gas supply for the purpose of delivering gas to 

 the 

boiler.

 

The SMART SYSTEM Control responds to internal and 

 

external signals and controls the blower, gas valve, and pumps 

 

to meet the heating demand. 

 

Designed to remove trapped air from the heat exchanger 

 coils.

 

Provides combustion air to the appliance.

Provides protection from outdoor elements.

 

The junction box contains the connection points for the line 

 

voltage power and all pumps.

 

Location from which the heat exchanger can be drained.

 

The connection board is used to connect external low voltage 

 devices.

 

Conduit connection points for the low voltage connection 

 board.

 

Connects the condensate drain line to a 1/2” PVC union.  

 

Provides access to the gas train and the heat exchanger.

 

Provides direct spark for igniting the burner.

 

The quartz glass window provides a view of the burner surface 

 and 

fl ame.

 

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

 

Protects the heat exchanger from an over pressure condition.  

 

The relief valve provided with the unit is set at 50 PSI.

 

Used by the control module to detect the presence of burner 

 

fl ame.

 

Conduit connection points for the high voltage junction box.

 

Removable panel to gain access to the internal components.

 

Turns 120 VAC ON/OFF to the boiler.

 

Used to allow the heat exchanger to be leveled.  This is needed 

 

for the proper draining of the condensate from the combustion 

 chamber.

 

The air shroud controls air and gas fl ow into the burner.

 

The air pressure switch detects blocked fl ue/inlet conditions.

 

break the control circuit, shutting the boiler down.

 

The pump relay board is used to connect the boiler, system and 

 DHW 

pumps.

 

The transformer provides 24V power to the integrated control.

 

Device that monitors the outlet water temperature. If the 

 temperature 

exceeds its setting, the integrated control will break 

 

the control circuit, shutting the boiler down.

 

An electrical switch designed to shut down boiler operation in 

 

the event the outer back of the heat exchanger, directly above the 

 

fl ue connection exceeds 604°F (318°C). This is a one time 

 

switch and could warrant a heat exchanger replacement.  Check 

 

the integrity of the rear refractory at the back of the upper coil if 

 

the switch opens.

 

Covers Over-temp switch and fl ue collar with fl ue sensor.

 The 

fl ow switch  is a safety device that ensures fl ow through 

 

the heat exchanger during operation. This appliance is low 

 

mass and should never be operated without fl ow. The fl ow 

 

switch makes contact when fl ow is detected and allows the unit 

 

to operate. If fl ow is discontinued during operation for any 

 

reason the fl ow switch will  break the control circuit and the 

 

unit wll shut down.

     

Outdoor Knight XL Installation & Operation 

Manual