Instruction/ maintenance manual of the product MP2 Lochinvar
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The MP 2 is capable of controlling the supply water tempera- ture for up to nine ON / OFF stages based on out door tem- perature, control for the Domestic Hot W ater (DHW) gener- ation, a set point requirement or optionally an external input signal (0 - 10 V (dc)).
This instruction manual is organized into four main sections: 1) Sequence of Operation, 2) Installation, 3) Control Settings, and 4) T esting and T roubleshooting.
DISPLA Y Boiler Demand DHW / Setpoint Demand WWSD External Input Signal Offset FIG . 2 SYMBOL DESCRIPTION FIG . 3 3.
The following defined terms and symbols are used through- out this manual to bring attention to the presence of hazards of various risk levels, or to bring attention to important infor- mation concerning the life of the product, see Figure 4 below .
C OMBUSTION A IR OR A LARM C ONT ACT The control has an isolated contact that can be used as either a combustion air damper contact or an alarm cont act. This selection is made using the C. A. / Alarm DIP switch. Combustion Air (C. A.) When the DIP switch is set to C.
Resetting the Rot ation Sequence T o reset the rotation sequence, set the Rotate / Of f DIP switch to the Off setting for 5 seconds and then return the DIP switch to the Rotate setting. R UNNING T IMES The control displays the accumulated running time of each boiler in the VIEW menu.
L O / H IO R L O / L O When using multi-stage boilers, a selection must be made regarding the staging order of the boiler(s). This adjustment is made in the ADJUST menu of the control. Lo / Hi If the Lo/Hi staging option is selected the control st ages in sequence all of the stages in a single boiler .
S T AGE D ELA Y The stage delay is the minimum time delay between the fir- ing of stages. After this delay has expired the control can fire the next stage if it is required.
B OILER P UMP O PERA TION In certain modes of operation, the control can operate the individual boiler pumps on each boiler in addition to the pri- mary pump. The boiler pump turns on prior to the boiler fir- ing and continues to run after the boiler is turned of f.
type of terminal unit. This improves the control of the air temperature in the building. B OILER I NDOOR D ESIGN T EMPERA TURE The indoor design temperature is the room temperature that was used in the original heat loss calculations for the build- ing.
H IGH M ASS R ADIANT (1) This type of a hydronic radiant floor is embedded in either a thick concrete or gypsumpour . This heating system has a large thermal mass and is slow acting (FIG .
SECTION E: DOMESTIC HOT W A TER OPERA- TION S ECTION E1: D OMESTIC H OT W A TER (DHW) DHW D EMAND A DHW Demand is required for the control to provide heat to the DHW system. A DHW aquastat or set point control is used as a switch in the DHW demand circuit.
DHW M ODE 4 - DHW IN P RIMARY / S ECONDAR Y WITH P RIORITY When a DHW Demand is present, the Relay 9 / DHW con- tact (terminals 30 and 31) is closed and the primary pump contact is closed.
N UMBER OF B OILERS U SED F OR DHW G ENERA TION The number of boilers used for DHW generation can be selected from one to the maximum number of boilers using the BOIL DHW setting. This applies when only a DHW Demand is present. If there are other demands present, the control does not limit the number of boilers operated.
B OILER T ARGET D URING S ET P OINT The boiler target temperature during a set point demand is increased to at least the Set Point setting. This temperature is maintained as long as the control has a set point demand.
I NPUT S IGNAL 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.
S TEP O NE ----- G ETTING R EADY Check the contents of this p ackage. If any of the contents listed are missing or damaged, please contact your whole- saler or Lochinvar sales representative for assist ance.
Set Point Demand T o generate a setpoint 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 .
Relay 9 / DHW If a DHW pump or DHW valve is connected to the Relay 9 / DHW contact (30 and 31) (FIG . 30), make sure the power to the pump or valve circuit is off and inst all a jumper between those terminals. When the DHW circuit is powered up, the DHW pump should turn on or the DHW valve should open completely .
A good quality electrical test meter , capable of reading from at least 0 - 300 V (ac) and at least 0 - 2,000,000 ohm, is essential to properly test the wiring and sensors. T EST T HE S ENSORS In order to test the sensors, the actual temperature at each sensor location must be measured.
T EST T HE O UTPUTS Primary Pump (Prim P1) If a primary pump is connected to the Prim P1 terminal (1 1), make sure that power to the terminal block is off and inst all a jumper between the Power L and Prim P1 terminals (10 and 1 1) (FIG . 37). When power is applied to the Power N and Power L terminals (9 and 10) (FIG .
C ONNECTING T HE C ONTROL Make sure all power to the devices and terminal blocks is off, and remove any remaining jumpers from the terminals. Reconnect the terminal blocks to the control by carefully aligning them with their respective headers on the control, and then pushing the terminal blocks into the headers.
The Alarm / C.A. DIP switch selects whether a combustion air damper or alarm device is to be connected to the C.A. / Alarm terminals (12 and 13) (FIG . 45). R O TAT E / O FF The Rotate / Of f DIP switch selects whether or not the con- trol is to provide Equal Run T ime Rotation of the boiler stages.
24 5 6.
A A A 1 7 8 9 25.
This item is only available if the External Input / Stand Alone DIP switch is set to Stand Alone. The item is only available if the External / Input Stand Alone DIP switch is set to Stand Alone. This item is only available if the External Input / Stand Alone DIP switch is set to Stand Alone.
Boiler Minimum Boiler Maximum Fire Delay 1 Fire Delay 2 Combustion Air Damper Delay Boil Mass Stage Delay Boiler Differential Staging DHW Mode DHW Exchange Occupied DHW Exchange Unoccupied 1 2 3 4 loh.
(This item is only available when DHW MODE is set to OFF .) x m weather (This item is only available if the External Input/ Stand Alone DIP switch is set to Stand Alone.) time that the primary pump will continue to operate after the boiler demand has been removed.
The control has a built-in test routine that is used to test the main control functions. The control continually monitors the sensors and displays an error message whenever a fault is found. See the following pages for a list of the control’ s error messages and possible causes.
The control was unable to read a piece of information stored in its memory (FIG . 53). Because of this, the control was required to reload the factory settings into all of the items in the ADJUST menu. The control will stop operation until all of the items in the ADJUST menu of the control have been checked by the user or installer .
The control is no longer able to read the boiler return sen- sor due to an open circuit (FIG . 59). The control will contin- ue to operate normally . Locate and repair the problem as described in INS7141. T o clear the error message from the control after the sensor has been rep aired, press either the Menu or Item button.
32 TYPICAL BOILER INST ALLA TION.
33 TYPICAL BOILER INST ALLA TION (CONTINUED).
34 MP2 T ekmar 150 Controller TYPICAL DWH PRIORITY HEA TING P ACKAGE SYSTEM.
35 NOTES.
9/04 - Printed in U.S.A..
An important point after buying a device Lochinvar MP2 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Lochinvar MP2 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Lochinvar MP2 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Lochinvar MP2 you will learn all the available features of the product, as well as information on its operation. The information that you get Lochinvar MP2 will certainly help you make a decision on the purchase.
If you already are a holder of Lochinvar MP2, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Lochinvar MP2.
However, one of the most important roles played by the user manual is to help in solving problems with Lochinvar MP2. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Lochinvar MP2 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
