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8 .7 I ndirect St ora ge Ta nk
Boilers MAHF- 75, 100, 125 can be elect rically connect ed
t o indirect st orage t ank as follows:
• Connect DHW priorit y
t erm inals 3 - 4 on t erm inal block M 2 .
1 0 K Ω
• I nsert
NTC sensor elem ent in t he sensor
well of indirect st orage t ank.
• Verify exchange capacit y of t he st orage boiler coil is
appropriat e for boiler power.
• Adj ust DHW t em perat ure + 95 ° F...+ 140 ° F ( + 35
° C...+ 60 ° C) by pressing
Cont rol.
Sensor s used for t his boiler ar e pr opr iet ar y
N o t e
t o t he m anufact ur er. Use of aft er m ar ket
sensor s w ill dim inish boiler per for m ance.
8 .9 M a na gem ent of 0 - 1 0 V I nput
The funct ions wit h 0...10V regulat or are act ivat ed by m eans of t heir param et ers:
To enable 0- 10V input change P8 2 = 4 t o P8 2 = 3 ,
When P7 8 = 1 t he input m anages t he heat ing set point t em perat ure direct ly.
When P7 8 = 2 t he input m anages t he heat ing power input direct ly.
Dem and is act ivat ed above 3V and heat ing set point is calculat ed in proport ion t o deviat ion from 3 t o 10 V DC, t o
give a set point t hat goes from m inim um t o m axim um .
Term inal # 9 is negat ive ( - ) , t erm inal # 10 is posit ive ( + ) .
P7 8 = 1
Voltage
Tem p Setting
° C
° F
0- 3
3
25
77
4
32
90
5
40
104
6
49
120
7
57
135
8
65
149
9
73
163
10
80
176
8 - ELECTRI CAL CON N ECTI ON S
1 0 K Ω
sensor NTC t o
on boiler
7 5
kW
MBH
4.9
16.6
7.3
24.9
9.7
33.3
12.0
12.2
41.6
15.4
14.7
50.0
18.5
17.1
58.3
22.2
19.5
66.6
25.3
21.2
75.0
27.4
FI GURE 8 - 7 Kt I ndirect St ora ge Ta nk
* 125 Model shown - See Applicat ion Guide for sizes 75, 100
A
Heat ing syst em
B
Three way divert er valve
Heating water flow
C
Heat ing supply t o DHW indirect st orage t ank
D
coil
E
Heat ing wat er ret urn
F
Tank
Optional 10k Ω DHW priority sensor
G
P7 8 = 2
1 0 0 / 1 1 5
kW
MBH
OFF
4.9
16.6
8.4
28.9
40.8
52.4
63.1
75.7
86.2
93.6
4 6
1 2 5 / 1 5 0
kW
MBH
6.4
22.0
10.7
36.5
14.9
51.0
19.2
65.5
23.4
80.0
27.7
94.5
31.9
109.0
36.9
125.0
240013503 REV A, [ 03/ 15/ 2022]
1 6 5 / 2 0 5
kW
MBH
8.6
29.5
14.4
49.0
19.9
68.0
25.5
87.0
31.1
106.0
36.6
125.0
42.5
145.0
48.1
164.0
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