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Table of contents for the manual
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Page 1
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)). A large easy to read display provides current system temperatures and operating stat[...]
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Page 2
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. The Sequence of Operation section has seven sub-sections. We recommend reading Section A: General Operation of the Sequence of Operation, as this contains import ant informa- tion on the[...]
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Page 3
DISPLA Y Boiler Demand DHW / Setpoint Demand WWSD External Input Signal Offset FIG . 2 SYMBOL DESCRIPTION FIG . 3 3[...]
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Page 4
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 . SECTION A: GENERAL OPERA TION P OWERING U P THE C ONTROL When the control is powered up, all segment[...]
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Page 5
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. A., terminals 12 and 13 can be used as a switch to operate a combustion air dampe[...]
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Page 6
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. When using a multi-stage boiler , the running time that is displa[...]
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Page 7
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 . Once all of the stages are turned on, the cont[...]
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Page 8
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. This setting can be adjust- ed manually or set to an automatic setting. When the auto- matic setting is used, the control determines the best stage delay based on the operation[...]
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Page 9
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. The amount of time that the boiler pump turns on prior to the boiler firing is dete[...]
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Page 10
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. This setting est ablishes the beginning of the character- ized heating curve, see Figure 15 belo[...]
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Page 11
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 . 17). L OW M ASS R ADIANT (2) This type of radiant heating system is either attached to the bottom of a wood sub-floor , suspended in the joist space, or sandwich[...]
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Page 12
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. Once the con- trol detects a DHW demand, the DHW Demand pointer turns on in the LCD and the c[...]
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Page 13
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. Priority can only be obt ained using exter- nal wiring. During a priority override, the Relay 9 / DHW contact is opened until the heating system has recovered be[...]
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Page 14
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. S ECTION E2: DHW WITH L OW [...]
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Page 15
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. S ET P OINT M ODE SETP MODE 1 - Setpoint in Parallel Whenever a set point demand is present, the boiler(s) is operated to maintain t[...]
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Page 16
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. 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 te[...]
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Page 17
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. MP 2 includes: One Boiler Control MP 2 , One Outdoor Sensor TST231 1, T wo T emperature Sensors TST2313, Instruction Manuals INS7141 and INS71[...]
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Page 18
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 . 26). The DHW MODE must be set to OFF . External Input (0 - 10 V dc) T o generate an external input signal, a voltage between 0 and 10 V (dc) must be applied to the Com - and Out + t[...]
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Page 19
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 . If the DHW pump or valve fails to [...]
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Page 20
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. A good quality digital thermometer with a surface temperat[...]
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Page 21
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 . 37), the primary pump sho[...]
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Page 22
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 terminal blocks should snap[...]
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Page 23
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. If the switch is set to Rot ate, the stages will [...]
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Page 24
24 5 6[...]
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Page 25
A A A 1 7 8 9 25[...]
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Page 26
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. 26[...]
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Page 27
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 lohi 27[...]
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Page 28
(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. 28[...]
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Page 29
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. When the T est but- ton is pressed, the test light is turned on. The[...]
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Page 30
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 . Note: The Inst[...]
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Page 31
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. If the boiler return sens[...]
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Page 32
32 TYPICAL BOILER INST ALLA TION[...]
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Page 33
33 TYPICAL BOILER INST ALLA TION (CONTINUED)[...]
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Page 34
34 MP2 T ekmar 150 Controller TYPICAL DWH PRIORITY HEA TING P ACKAGE SYSTEM[...]
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Page 35
35 NOTES[...]
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Page 36
9/04 - Printed in U.S.A.[...]