Lochinvar CF-CH(E)-i&s-08, 999 - 750, 399 Access Levels, Temperature Control, Placement of Sensors

Hydronic Heating Boilers and Domestic Water Heaters

OPERATION Continued

Scroll through the different settings by pressing the “Select” button. Change settings by pressing either the “+” button or the “–” button.

If no buttons are pushed after a few seconds, the control will time-out and return to the “View” menu.

TABLE–Q, page 44 lists the Adjust Menu settings for the different operation modes.

Access Levels

There are two levels of programming access for this temperature control. These are the Advanced access level and the User access level. The control is set to the Advanced access level at the factory. You may wish to switch the control to the User level, limiting the operator to certain basic programming options. TABLE–Q shows the various menu settings for this control. The items marked with an asterisk (*) indicate adjustments only available in the Advanced access level.

To switch from the Advanced access level to the User access level, move the dip switch located on the back side of the temperature control (see FIG. 49).

DIP SWITCH

FIG. 49 User Access Level Dip Switch Location

Temperature Control

This is a four-stage temperature control that controls the burner ignition, pump, and alarm functions. This temperature controller can measure four different sensor inputs. They are as follows:

1.Outside Air Temperature Sensor

2.Inlet Water Temperature Sensor

3.Outlet Water Temperature Sensor

4.Multi-Purpose Temperature Sensor

Outside Air Temperature Sensor

Only use this sensor for boiler operations. This allows you to

tie boiler operation to the outside air temperature. As outside temperatures drop, the control will increase the temperature to the boiler. As outside temperatures rise, the control will decrease the temperature to the boiler. You can set the control to shut the boiler off when a desired outside air temperature level is reached.

Inlet Water Temperature Sensor

This sensor measures the inlet water temperature coming into the unit. This is the default controlling sensor as shipped from the factory.

Outlet Water Temperature Sensor

This sensor measures the outlet water temperature leaving the unit.

Multi-Purpose Temperature Sensor

Depending on what mode the control is in, this sensor is either a tank sensor or a system sensor.

Placement of Sensors

Outside Air Temperature Sensor

The outside air temperature sensor will only be used for boiler systems. The outside air sensor is optional. You can purchase the sensor from the appliance manufacturer. The sensor comes with a housing that helps protect the sensor from the elements. Mount the air sensor housing under the eve of the roof. Make sure the housing is out of direct sunlight. This will ensure that the sensor will accurately read the true outdoor temperature. For more information on mounting the sensor, see Remote Mounting of Sensors, page 48.

Inlet and Outlet Water Temperature Sensors

The inlet and outlet water temperature sensors are placed into the inlet or outlet bulbwells on the boiler. These sensors are installed by the factory in new units. If you have to reposition these sensors, use a thermal-conductive paste to coat the sensors. Insert the sensors in the appropriate bulbwell. Make sure to insert the sensors all the way into the bulbwell, leaving no air pocket between the front surface of the sensor and the back of the bulbwell. Air pockets are thermally non-conductive and will cause sensors to not read accurately.

Multi-Purpose Temperature Sensor

You can use the multi-purpose temperature sensor as a tank sensor or as a system sensor. Install a bulbwell (provided by the appliance manufacturer) in a water tank or a system loop. Place the multi-purpose temperature sensor in the bulbwell to monitor the water temperature.

Tank Sensor: This is used in water heating applications. Place sensor in water storage tank to measure water temperature. For more information on mounting the sensor, see Remote Mounting of Sensors, page 48.

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