INSTALLATION
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 con- trols that are intended and certified as safety limits must be placed into the control circuit. Do not open the con- trol. Refer to qualified personnel for servicing. Opening voids warranty and could result in damage to the equip- ment and possibly even personal injury.
STEP ONE
Check the contents of this package. If any of the contents listed are missing or damaged, please contact your whole- saler 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 con- trol for your application.
STEP TWO
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 volt- ages. 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 must not be applied to any of the wires during the
•All wires are to be stripped to a length of 3/8" (9 mm) to ensure proper connection to the control.
•If an Outdoor Sensor TST2311 is used, install the sensor according to the installation instructions in the INS7141 and run the wiring back to the control.
•Install the TST2311 sensor according to the installation instructions in the Data Brochure D 070 and run the wiring back to the control.
•If a TST2311 sensor is used, install the sensor according to the installation instructions in the Data Brochure D 070 and run the wiring back to the control.
•Run wire from other system components (pumps, boilers, etc.) to the control.
•Run wires from the 115 V (ac) power to the control. Use a clean power source with a 15 A circuit to ensure proper operation.
STEP THREE
CONTROL
General
The installer should test to confirm that no voltage is pres- ent at any of the wires. Push the control into the base and slide it down until it snaps firmly into place.
POWERED INPUT CONNECTIONS
115 V (ac) Power
Connect the 115 V (ac) power supply to the Power L and Power N terminals (10 and 9) (FIG. 26). This connection provides power to the microprocessor and display of the control. As well, this connection provides power to the Prim P1 terminal (11) from the Power L terminal (10).
Boiler Demand
To generate a boiler demand, a voltage between 24 V (ac) and 230 V (ac) must be applied across the Boil Dem and Com Dem terminals (6 and 7) (FIG. 26).
DHW Demand
To generate a DHW Demand, a voltage between 24 V (ac) and 230 V (ac) must be applied across the Setp / DHW and Com Dem terminals (8 and 7) (FIG. 26). If using DHW, the last boiler in MODE 1, 4 or 5 must be set to OFF and DHW MODE must also be set to 1 through 4.
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