Service Manual

1 Service

Viewable and changeable control parameters

NOTICE

See Table 1B on pages 13 - 17 of this manual for parameter references listed in this section. The parameter

references listed in this section will not appear on the LCD screen.

 

CAUTION

Before changing parameters, note the

settings so that the unit can be returned to

 

 

its original operating parameters.

A: Initial Setup

Clock and Date

The control uses an internal clock for the night setback feature and for logging of events. For these features to work correctly, the clock must be set when the boiler is first installed or anytime the boiler has been powered off for more than four (4) hours. This parameter must be accessed to set the clock. Parameter A2 sets the date.

NOTICE

The internal clock does not adjust for

Daylight Savings Time and therefore,

 

 

will require a manual adjustment.

Parameters A3 - A12 shown in the Initial Setup Menu are grouped here for convenience. For a detailed explanation of each parameter, reference the specific menu for each parameter.

B: Set Points

Space Heating (SH) Minimum Set Point

The SH minimum set point sets the minimum water temperature set point that can be used for space heating operation. The user or installer will not be able to program the control with a lower SH set point. This parameter can only be changed by the installer by accessing parameter B1.

Space Heating (SH) Maximum Set Point

The SH maximum set point sets the maximum water temperature set point that can be used for space heating. The user or installer will not be able to program the control with a higher SH set point. This parameter can only be changed by the installer by accessing parameter B2.

Space Heating (SH) Set Point

The SH set point sets the water temperature set point used during space heating calls. This parameter can be changed by the installer by accessing parameter B3.

18

SH Offset

The SH offset sets how many degrees above set point the temperature can go before the boiler will shut off. This parameter can only be changed by the installer by accessing parameter B4.

SH Differential

The SH differential sets how many degrees below the offset the temperature has to drop before the boiler turns back on. This parameter can only be changed by the installer by accessing parameter B5.

HWG Tank Set Point

By installing a tank sensor, the SMART TOUCH control can perform the tank thermostat function. The SMART TOUCH control automatically detects the presence of this sensor, and generates a call for heat when the tank temperature drops below the tank set point minus the differential (parameter B7), and finishes the call for heat when the tank temperature reaches tank set point. This parameter can be changed by the installer by accessing parameter B6.

HWG Tank Differential

When a tank sensor is installed, the tank temperature must drop this amount below the tank set point (parameter B6) before the boiler will turn on. The installer can adjust this setting by accessing the parameter B7.

Manual Reset High Limit

The SMART TOUCH control contains an integral Manual Reset High Limit (MRHL) on the outlet of the heat exchanger. Once the outlet temperature exceeds the MRHL set point, the boiler will shut down and lock out. Once the outlet temperature has dropped below this set point, the RESET button on the LCD display must be pressed to clear this lockout. This set point can be adjusted by accessing parameter B8.

Auto Reset High Limit

The SMART TOUCH control contains an integral Auto Reset High Limit (ARHL) on the outlet of the heat exchanger. Once the outlet temperature exceeds the ARHL set point, the boiler will shut down and lock out. Once the outlet temperature has dropped below this set point, the RESET button on the LCD display can be pressed to reset this lockout. If RESET is not pressed, the control will automatically reset the lockout after five (5) minutes. This set point can be adjusted by accessing parameter B9.

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Lochinvar 2.5, 1.5, 3.5 service manual Viewable and changeable control parameters, Initial Setup, Set Points

3, 2, 3.5, 2.5, 1.5 specifications

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