Specifications

Page 20

3.0 TECHNICAL SPECIFICATION

Table 3.6 mCHP BoilerMate

A-CLASS

Indentiﬁcation Values

Models ID Resistor Value Controller Code

mCHP BMA 225

10K A06

mCHP BMA 235

Table 3.7 sensor used in mCHP BoilerMate

Display Sensor Connector J9 pins Location

S1 T Overheat 1 6 & 14

Top of store in dry pocket (S1 & S2 are in single housing)

S2 T Overheat 2 2 & 10

S3 T DHW in 3 & 11 In cold water inlet pipe (Wet i.e. direct)

S4 T DHW out 4 & 12 In hot water outlet pipe (Wet i.e. direct)

S5 T Tank bottom 5 & 13 Bottom of store in dry pocket for Off-Peak IH

S6 T Tank middle 1 & 9 Middle of store in dry pocket for On-Peak IH

Table 3.5 System Control Set Points

BMA 225

BMA 235

1 DHW control temperature, sensor S4 55ºC

2 Hot water priority ON set point, Sensor S6 54ºC

Hot water priority OFF set point, Sensor S6 58ºC

(1)

CH Pump max speed 255

CH Pump min speed 110

CH return temperature set point, Sensor S5 55ºC

4 Bottom store sensor, S5, ON set point 60ºC

Bottom store sensor, S5, OFF set point 70ºC

5 Middle store sensor, S6, ON set point 68ºC

Middle store sensor, S6, OFF set point 77ºC

6 mCHP boost ON set point in HW only mode (T_HW_boost_on) 52ºC

mCHP boost OFF set point in HW only mode (T_HW_boost_off) 57ºC

7 mCHP boost ON set point in CH only mode (T_CH_boost1_on) 55ºC

mCHP boost OFF set point in CH only mode (T_CH_boost1_off) 65ºC

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) 40ºC

Electric boost OFF set point in CH only mode (T_CH_boost2_off) 50ºC

Electric boost ON/OFF rate of change set point (R_CH_boost2)

9 Overheat set point, Sensor S1/S2 95ºC

Notes:

(1)

Only when modulating pump option is speciﬁed