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3.0 TECHNICAL SPECIFICATION
Table 3.5 System Control Set Points
1
DHW control temperature, sensor S4
2
Hot water priority ON set point, Sensor S6
Hot water priority OFF set point, Sensor S6
(1)
3
CH Pump max speed
CH Pump min speed
CH return temperature set point, Sensor S5
4
Bottom store sensor, S5, ON set point
Bottom store sensor, S5, OFF set point
5
Middle store sensor, S6, ON set point
Middle store sensor, S6, OFF set point
6
mCHP boost ON set point in HW only mode (T_HW_boost_on)
mCHP boost OFF set point in HW only mode (T_HW_boost_off )
7
mCHP boost ON set point in CH only mode (T_CH_boost1_on)
mCHP boost OFF set point in CH only mode (T_CH_boost1_off )
mCHP boost ON/OFF rate of change set point (R_CH_boost1)
8
Electric boost ON set point in CH only mode (T_CH_boost2_on)
Electric boost OFF set point in CH only mode (T_CH_boost2_off )
Electric boost ON/OFF rate of change set point (R_CH_boost2)
9
Overheat set point, Sensor S1/S2
(1)
Notes:
Only when modulating pump option is specified
Table 3.6 mCHP BoilerMate
Models
mCHP BMA 225
mCHP BMA 235
Display
Sensor
S1
T Overheat 1
S2
T Overheat 2
S3
T DHW in
S4
T DHW out
S5
T Tank bottom
S6
T Tank middle
A-CLASS
Indentification Values
ID Resistor Value
Controller Code
10K
Table 3.7 sensor used in mCHP BoilerMate
Connector J9 pins
6 & 14
Top of store in dry pocket (S1 & S2 are in single housing)
2 & 10
3 & 11
in cold water inlet pipe (Wet i.e. direct)
4 & 12
in hot water outlet pipe (Wet i.e. direct)
5 & 13
Bottom of store in dry pocket for Off-Peak iH
1 & 9
Middle of store in dry pocket for On-Peak iH
BMA 225
BMA 235
55ºC
54ºC
58ºC
255
110
55ºC
60ºC
70ºC
68ºC
77ºC
52ºC
57ºC
55ºC
65ºC
40ºC
50ºC
95ºC
A06
Location
Page 20
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