Lochinvar 151 operation manual Armor Water Heater How it works, Stainless steel heat exchanger

Installation & Operation Manual

The Armor Water Heater - How it works...

1.Stainless steel heat exchanger

Allows water to flow through specially designed coils for maximum heat transfer, while providing protection against flue gas corrosion. The coils are encased in a jacket that contains the combustion process.

2.Combustion chamber access cover

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

3.Blower

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.

4.Gas valve

The gas valve senses the negative pressure created by the blower, allowing gas to flow only if the gas valve is powered and combustion air is flowing.

18.Air intake adapter

Allows for the connection of the PVC air intake pipe to the water heater.

19.High voltage junction box

The junction box contains the connection points for the line voltage power and the pump.

20.Water heater drain port

Location from which the heat exchanger can be drained.

21.Low voltage connection board

The connection board is used to connect external low voltage devices.

22.Low voltage wiring connections (knockouts)

Conduit connection points for the low voltage connection board.

5.Venturi

The venturi controls air and gas flow into the burner.

6.Flue gas (limit rated)

This sensor monitors the flue gas exit temperature. The control module will modulate and shut down the water heater if the flue gas temperature gets too hot. This protects the flue pipe from overheating.

7.Water heater outlet temperature sensor (housed with the high limit sensor)

This sensor monitors water heater outlet water temperature (system supply). If selected as the controlling sensor, the control module adjusts water heater firing rate so the outlet temperature is correct.

8.Water heater inlet temperature sensor

This sensor monitors return water temperature (system return). If selected as the controlling sensor, the control module adjusts the water heater firing rate so the inlet temperature is correct.

9.Flow Switch

The flow switch is a safety device that ensures flow through the heat exchanger during operation. This appliance is low mass and should never be operated without flow. The flow switch makes contact when flow is detected and allows the unit to operate. If flow is discontinued during operation for any reason the flow switch will break the control circuit and the unit will shut down.

10.Electronic LCD display

The electronic display consists of 4 buttons, a navigation dial and a multiple line liquid crystal display.

11.Flue pipe adapter

Allows for the connection of the PVC vent pipe system to the water heater.

12.Burner (not shown)

Made with metal fiber and stainless steel construction, the burner uses pre-mixed air and gas and provides a wide range of firing rates.

13.Water outlet

NPT water connection that supplies hot water to the tank.

14.Water inlet

NPT water connection that returns water from the tank to the heat exchanger.

15.Gas connection pipe

Threaded pipe connection. This pipe should be connected to the incoming gas supply for the purpose of delivering gas to the water heater.

16.SMART SYSTEM Control Module

The SMART SYSTEM Control responds to internal and external signals and controls the blower, gas valve, and pumps to meet the demand.

17.Manual air vent

Designed to remove trapped air from the heat exchanger coils.

23.Condensate drain connection

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

24.Access cover - front (not shown)

Provides access to the gas train and the heat exchanger.

25.Ignition electrode

Provides direct spark for igniting the burner.

26.Flame inspection window

The quartz glass window provides a view of the burner surface and flame.

27.Gas shutoff valve

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

28.High limit sensor (housed with the outlet temperature sensor)

Device that monitors the outlet water temperature. If the temperature exceeds its setting, the integrated control will break the control circuit, shutting the water heater down.

29.Relief valve

Protects the heat exchanger from over pressure and temperature conditions. The relief valve is set at 150 PSI.

30.Flame sensor

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

31.Line voltage wiring connections (knockouts)

Conduit connection points for the high voltage junction box.

32.Top panel

Removable panel to gain access to the internal components.

33.Power switch

Turns 120 VAC ON/OFF to the water heater.

34.Leveling legs

Used to allow the heat exchanger to be leveled. This is needed for the proper draining of the condensate from the combustion chamber.

35.Air shroud (501 Model Only)

The air shroud directs air and gas flow into the burner.

36.Air pressure switch

The air pressure switch detects blocked inlet or outlet conditions.

37.Pump relay (not shown)

The pump relay is used to control the circulation pump.

38.Transformer

The transformer provides 24V power to the integrated control.

39.Gas shutoff switch

An electrical switch designed to cut power to the gas valve to prevent releasing any gas.

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