gledhill BOILERMATE CP BMSCP120 Instruction Manual page 14

SERVICING AND MAINTENANCE
1 2 3
4 5 6
2 4
J19
1 3
2 4
J20
1 3
7
14
6 13
5 12
4 11
J18
3 10
9
2
8
1
J7
J3
2
8 7 6 5
1
4 3 2 1
Fuse
To
DHW
pipe
Tasseron NTC 12k thermistor Huba combined flow sensor and NTC 10k thermistor
Resistance Temperature Resistance
Ohm °C ±°C Ohm
309396 -40 1.7 334275
171840 -30 1.7 47369
98932 -20 1.6 26023
58879 -10 1.5 11000
36129 0 1.4 10500
22804 10 1.4 10000
14773 20 1.3 9500
12000 25 1.2 9000
9804 30 1.2 8500
6652 40 1.1 8000
4607 50 1 7500
3252 60 0.9 7000
2337 70 1.1 6500
1707 80 1.3 6000
1266 90 1.5 5500
952 1.8 5000
100
4500
4000
Used on the store temperature sensors and the
3500
cold water inlet temperature sensors
3000
2500
2000
1500
1000
R-nominal 12Kohm @25°C R-nominal
B-value B3740K B-value
3%@60°C
R-Tolerance R-Tolerance under 25°C±0.025*T °C over 25°C±0.05*T °C
Tmin -40°C Tmin
Tmax 150°C Tmax
FAULT FINDING
GND GND Combined flow
IN OUT
and
T1 T2
HW temperature
sensor
All the these sensor inputs carry a
Voltage of 5V.
The max cable length is 1 meter.
2
TS sensor
The sensors connected to the control
J1
1
Should be free from the appliance earth
2
CW sensor
1
J8
6 1
7 2
8 3
9 4
5
10
E – G/Y
N - Blue
L - Brown
PR61
flow rate determination
Temperature
HZ l/min HZ
°C ±°C
20 3.4 95
-36 0.9
-6 0.1
25 4.4 100
5 0.1
30 5.3 105
23 0.6
24 0.6
35 6.2 110
25 0.6
40 7.1 115
26 0.7
45 8.0 120
27 0.7
29 1.4
50 8.9 125
30 1.5
55 9.8 130
31 1.6
33 1.7 60 10.7 135
35 1.7
65 11.7 140
37 1.8
70 12.6 145
39 1.9
41 2.1
75 13.5 150
44 2.2
80 14.4 155
47 2.3
85 15.3 160
50 2.5
54 2.7
90 16.2 165
59 2.9
65 3.3
73 3.7
86 4.3
12Kohm @25°C
B4050K
-40°C
125°C
Page 26
SERVICING AND MAINTENANCE
Check for presence of overheat link
An overheat link connection should be present in connection Junction 7. If you are
fitting a new board the overheat link that is on the board just removed must be retained
as the newly supplied board will not have one fitted.
Check outputs from the PWM controller PCB to the pump
PWM pump power
PWM frequency
Duty cycle
l/min
17.1
18.0
19.0
19.9
20.8
21.7
22.6
23.5
24.4
25.3
26.2
27.2
28.1
29.0
29.9
Check 230V ac across Junction 8, L(10) to E(6) and L(10) to N(8) (live test)
Check for 0-15V ac across Junction 8, N(8) to E(6) (live test)
Power on the unit
Set the multi meter to measure the frequency
Measure the PWM frequency produced by the board between pins 3 on J8 and pin 9 on J8
This can be between 100Hz – 5000 Hz (1000Hz nominal)
(Lab tested figure of 562Hz recorded in steady state conditions).
Switch your Multimeter to 'duty cycle or %' then it will show a percentage from 0 to 100%.
This percentage is the command for the pump how fast it should run.
When you perform a small DHW tapping, the percentage will be low
When you perform a large DHW tapping, the percentage will be higher
PWM input signal [%] indications
• 0-7 Pump stops (Standby)
• 7-15 Pump runs at minimum speed (operation)
• 12-15 Pump runs at minimum speed (start-up)
• 15-95 Pump speed increases linearly from minimum to maximum
• > 95 Pump runs at maximum speed
Page 27
FAULT FINDING