Lochinvar 2072 Operating information, General, How the appliance operates, Protection features

7 Operating information

General

How the appliance operates

The Copper-fin2uses a copper finned tube heat exchanger to transfer heat from the flue products to the water. An electronic control module monitors various inputs to initiate a call for heat. The blower provides both primary and secondary air to the burner and forces the flue products out of the combustion chamber and into the vent system. The control module regulates the blower speed and firing stages, based upon the heat demand. Gas valves regulate the amount of gas supplied for the firing stages, which is then mixed with the combustion air supplied to the burner.

NOTICE If an inline high gas pressure regulator is used, it MUST BE of the lockup type and

be located a minimum of 10 feet from the appliance. Failure to do so may result in insufficient gas volume supplied to the appliance.

NOTICE If a pressure drop of more than 2" water column occurs between Standby (static)

Mode and Operating (dynamic) Mode, a gas volume problem exists. Contact the gas utility, gas supplier, qualified installer, or service agency to determine the necessary steps to provide the proper gas volume to the appliance.

How the control module operates

The SMART SYSTEM control module receives input from appliance sensors and external devices. The control module activates and controls the blower and gas valves to regulate heat input and switches the pool heater and system pumps on and off as needed. The user programs the module to meet system needs by adjusting control parameters. These parameters set operating temperatures and appliance operating modes. Pool heater operation is based on pool heater return temperature.

Control inputs and outputs

Staging S1 - S4

The S1 input tells the pool heater to provide water for space heating. The S2 - S4 inputs are not used.

Remote Aquastat/EMS

This input can be used to remotely enable/disable the pool heater.

Installation & Operation Manual

Pool heater pump operation

The pool heater’s unit pump will turn on whenever there is a call for heat based on the set point of the pool return water and it will remain on as long as the unit is firing. Once set point is achieved, the pump will complete a purge cycle to remove any residual heat from the heat exchanger and will then turn off. Note: If the pump’s pre-running feature is active, the pump will run for several minutes prior to the unit firing in order to purge any air from the pool system that may have become entrapped during extended periods of inactivity.

Pool return programmed as controlling sensor

The pool heater controller is programmed from the factory to utilize the pool return sensor as the controlling sensor. The pool return sensor is required to be the controlling sensor and CANNOT be changed by either the installer or the end user.

Anti-cycling

After the set point has been satisfied, the control will delay the next burner cycle for a set time period (time is adjustable by the installer). The time delay will be bypassed if the system return temperature drops too far during the delay.

Firing rate

Depending upon the model, the Copper-fin2is capable of staging its firing rate from a minimum of 25% to a maximum of 100%. The firing rate is dictated by the call for heat (i.e., pool return temperature), the heating load, and various other temperature limitations.

Gradient limiting

If during operation of the heater the outlet water temperature is rising too quickly, the control will reduce the firing rate to its lowest setting.

Night setback

The controller may be programmed to reduce the set point during a certain time each day. A start and stop time can be programmed for each day of the week.

Protection features

Outlet temperature, and temperature rise limiting

The outlet temperature is monitored by the pool heater outlet temperature sensor. When the outlet temperature exceeds 180°F (82°C), the unit will reduce the firing rate. If the outlet water temperature exceeds 200° (93°C) the control will shut the unit down until it cools off.

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