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An external signal is generated by applying a voltage between 0 v (dc) and 10 v (dc) across the out + and Com - terminals (4 and 1) (FIG. 25). Once voltage is applied, the External Input Signal pointer is displayed in the LCD and the control closes the primary pump contact. The control calculates a boiler target supply temperature based on the external input signal and the settings made in the control. The control then fires the boiler(s), if required, to maintain the target supply temperature. If the external signal goes below the minimum voltage, the External Input Signal pointer is turned off in the display. The boiler target temperature is displayed as " — " to indicate that there is no longer a call for heating. The primary pump and boiler pumps operate as described in section C. FIG. 25 15 Input Signal External Input Signal Conversion Tables The control can accept either a 0 - 10 V (dc) signal or a 2 -10 V (dc) signal. The External Input Signal setting must be set to the proper setting based on the signal that is being sent to the control. 0 - 10 V (dc) or 0 - 20 mA When the 0 - 10 V (dc) signal is selected, an input voltage of 1 V (dc) corresponds to a boiler target temperature of 50°F (10°C). An input voltage of 10 V (dc) corresponds to a boiler target temperature of 210°F (99°C). As the voltage varies between 1 V (dc) and 10 V (dc) the boiler target temperature varies linearly between 50°F (10°C) and 210°F (99°C). If a voltage below 0.5 V (dc) is received the boiler target temperature is displayed as " - - - " indicating that there is no longer a call for heating. A 0 - 20 mA signal can be converted to a 0 - 10 V (dc) signal by installing a 500 ohm resistor between the Out + and Com - terminals (4 and 1). 2 - 10 V (dc) or 4 - 20 mA When the 2 - 10 V (dc) signal is selected, an input voltage of 2 V (dc) corresponds to a boiler target temperature of 50°F (10°C). An input voltage of 10 V (dc) corresponds to a boiler target temperature of 210°F (99°C). As the voltage varies between 2 V (dc) and 10 V (dc) the boiler target temperature varies linearly between 50°F (10°C) and 210°F (99°C). If a voltage below 1.5 V (dc) is received the boiler target temperature is displayed as " - - - " indicating that there is no longer a call for heating. A 4 - 20 mA signal can be converted to a 2 - 10 V (dc) signal by installing a 500 ohm resistor between the Out + and Com - terminals (4 and 1). Offset The Offset setting allows the boiler target temperature to be fine tuned to the external input signal. The control reads the external input signal and converts this to a boiler target temperature. The Offset setting is then added to the boiler target temperature. CONVERSION TABLE 0 -10 0 - 20 mA* 0-10 V(dc) Boiler Tarqet 0 0 -(OFF) 2 1 50°F (10°C) 4 2 68°F (20°C) 6 3 86°F (30°C) 8 4 103°F (39°C) 10 5 121°F (49°C) 12 6 139°F (59°C) 14 7 157°F (69°C) 16 8 174°F (79°C) 18 9 192°F(89°C) 20 10 210°F (99°C) *Requires 500 ii Resistor in Parallel CONVERSION TABLE 2 -10 4 - 20 mA* 2-10 Vide) Boiler Tarqet 0 0 --(OFF) 4 2 50°F (10°C) 6 3 70°F (21 °C) 8 4 90°F (32°C) 10 5 110°F (43°C) 12 6 130°F (54°C) 14 7 150°F (66°C) 16 8 170°F (77°C) 18 9 190°F (88°C) 20 10 210°F (99°C) *Requires 500 n Resistor in Parallel Example Range = 0 -10 V (dc) —, Input = 7 V (dc) -I-► 157°F(69°C) Offset = +5°F (3°C) ->• +5°F (3°C) Boiler Target = 162°F(72°C) 16 INSTALLATION A CAUTION Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury. It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. This electronic control is not intended for uses as a primary limit control. Other controls that are intended and certified as safety limits must be placed into the control circuit. Do not open the control. Refer to qualified personnel for servicing. Opening voids warranty and could result in damage to the equipment and possibly even personal injury. Step One-----Getting Ready Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or Lochinvar sales representative for assistance. MP2 includes: One Boiler Control MP2, One Outdoor Sensor TST2311, Two Temperature Sensors TST2313, Instruction Manuals INS7141 and INS7162 Note: Carefully read the details of the Sequence of Operation to ensure that you have chosen the proper control for your application. A Step Two — Rough-In Wiring All electrical wiring terminates in the control base wiring chamber. The base has standard 7/8" (22 mm) knockouts which accept common wiring hardware and conduit fittings. Before removing the knockouts, check the wiring diagram and select those sections of the chamber with common voltages. Do not allow the wiring to cross between sections as the wires will interfere with safety dividers which should be installed at a later time. Power m...

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