Lochinvar 2072, 502 The Copper-fin2 - How it works, Installation & Operation Manual

Models: 2072 502

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The Copper-fin2- How it works...

Installation & Operation Manual

The Copper-fin2- How it works...

1.Heat exchanger

The heat exchanger allows system water to flow through specially designed tubes for maximum heat transfer. The glass lined headers and copper fined tubing are encased in a jacket that contains the combustion process.

2.Heat exchanger access cover

The heat exchanger access cover is a galvanized steel door which allows access for service, maintenance, and removal of the heat exchanger from inside the combustion chamber.

3.Blower

The blower pulls in and injects air into the individual burners along with gas from the gas manifold where the mix is burned inside the combustion chamber.

4.Gas valve

The referenced gas valves have a dual purpose; changing the gas supply pressure to manifold pressure, and the reference side of the gas valve is designed to allow chamber pressure to change the volume of gas through the valve. This is not a design to compensate for gas supply pressure issues.

5.Outlet/limit temperature sensor

This 4-wire limit rated sensor monitors the outlet temperature to ensure safe operation. The appliance will adjust its firing rate to maintain water temperatures below the maximum allowable outlet temperature.

6.Inlet temperature sensor

This 2-wire sensor monitors the inlet temperature. The appliance will adjust the position of the 3-way valve to maintain the inlet water temperature above the minimum allowable inlet temperature.

7.Electronic display

The electronic display consists of 6 buttons and a two-line 16-character liquid crystal display used to monitor the operation of the heater as well as enter and view the programming of the main control board.

8.Burner

The burner is a ported stainless steel construction which uses a gas air mix to operate at a fixed input. Banks of burners turn on or off to vary the firing rate.

9.Pool supply/limit sensor (not shown)

This 4-wire limit rated sensor monitors the temperature of the water being supplied to the pool to ensure safe operation. The appliance will shut down if the maximum allowable pool supply temperature is exceeded.

10.Pool return sensor (not shown)

This 2-wire sensor is the controlling sensor and it monitors the temperature of the pool water. The appliance will stage to maintain pool temperature set point and turn off when set point is met.

11.Gas supply pipe

The gas supply pipe on this appliance is 1 1/4 or 2" (depending on model) diameter NPT. Please reference the National Fuel Gas Code charts for connection details.

15.Low voltage connection board

The low voltage connection board provides a location to connect all of the low voltage devices to the appliance. This is where most of the external safety controls are connected.

16.Front doors - upper and lower

The front doors provide access to the gas train as well as the blower, burners and other key components for service and maintenance.

17.Hot surface igniter (HSI)

The hot surface igniter is a device that is used to ignite the air/gas mixture as well as monitor the performance of the flame during operation. This device acts as a flame sense electrode.

18.Flame inspection window (sight glass)

The flame inspection windows, located on either side of the appliance, allow for visual inspection of the burners and flame during operation.

19.Manual reset high limit sensor

This device monitors the outlet water temperature to ensure safe operation. If the temperature exceeds its setting (field adjustable), it will break the control circuit, shutting the appliance down. Manual reset is performed through the display.

20.Relief valve

The relief valve is a safety device that ensures the maximum pressure of the appliance is not exceeded. Pool heaters operate on temperature and pressure and are shipped standard as 150 PSI and 210°F (98.9°C).

21.Power switch

The power switch is used to engage and disengage power to the appliance on the 120 VAC circuit.

22.Air pressure switch

The air pressure switch is a safety device which ensures proper blower operation. The air pressure switch is wired in series with the low voltage control circuit in such a way that if the fan does not engage or shuts down prematurely the device will break the control circuit and the unit will shut down.

23.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.

24.Drain port(s)

Location from which the heat exchanger can be drained. The drain ports are located underneath the front header.

25.Manual shutoff valve (not shown)

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

12.SMART SYSTEM Control Module

The SMART System Control Module is the main control for the appliance. This module contains the programming that operates the blower, gas valve, and pumps in addition to other programmable features.

13.Air intake

Fresh air for combustion is drawn through a filter provided at the air intake, located at either the rear or right side of the appliance.

14.Line voltage terminal strip

The line voltage terminal strip provides a location to connect all of the line voltage (120 VAC) contact points to the unit.

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Lochinvar 2072, 502 operation manual The Copper-fin2 - How it works, Installation & Operation Manual