UTICA BOILERS MAH-100 Manual page 115

2. 10k Ω Indirect Storage Tank Sensor Kit
Heating Only boiler can be electrically connected to
Indirect Storage Tank.
Diagram of electrical connection of external indirect
storage tank is shown below.
Connect DHW priority sensor to terminals 3 and 4 on
terminal block M2. The element of the sensor must be
inserted in the sensor well located on the indirect storage
tank.
Verify the exchange capacity of the indirect boiler
tank coil is appropriate for power of the heating only
boiler. Adjust DHW temperature (+95°F...+140°F /
+35°C...+60°C) by pressing
control panel.
Electrical Connection
Heating Only Boiler
10
9
8
7
6
5
4
3
2
1
Management of 0-10V Input
To activate the 0-10v function parameter 82 must be set to 3.
There must be at or above 3 V DC present for the control to recognize a call for heat.
When P78 = 1 the 0-10v input manages CH heating setpoint directly per chart below.
When P78 = 2 the 0-10v input manages CH heating input directly per chart below.
When P78 = 0 Disabled
P78=1
Temp Setting
Voltage
°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
ACCESSORIES
buttons on boiler
S
10k Ω
Indirect DHW Tank
Sensor Wiring
(100 & 125 MODELS)
100/115
kW MBH
4.9 16.6
8.4 28.9
12.0 40.8
15.4 52.4
18.5 63.1
22.2 75.7
25.3 86.2
27.4 93.6
Parameter PO3 for Heating Only boiler, with no
Note
indirect tank remains Factory Set at 08. No change
is required.
If adding an Indirect Tank with a sensor to
Heating Only Boiler - change PO3 parameter
from 08 to 05.
If adding an Indirect Tank with a thermostat to
Heating Only Boiler - change PO3 parameter
from 08 to 04.
See Section 9, Parameter Settings, in boiler's
Installation, Operation, and Maintenance Manual.
Parameter PO3 for COMBI boiler factory set at OO
requires no change.
Electrical Connection
Heating Only Boiler
10
9
8
7
6
5
4
3
2
1
P78 = 2
125/150
kW MBH
OFF
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
31
Indirect DHW Tank
End Switch Wiring
(100,125 & 165
MODELS)
165/205
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
PN 240011430 REV. P [09/15/2021]