UTICA BOILERS MAHF-165 Installation, Operation And Maintenance Manual page 97

2. 10k Ω Indirect Storage Tank Sensor Kit
Heating Only boiler can be electrically connected to
Indirect Storage Tank.
Diagram of hydraulic 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 storage boiler coil
is appropriate for power of the boiler. Adjust DHW
temperature (+95°F...+140°F / +35°C...+60°C) by
pressing
Management of 0-10V Input
The functions with 0...10V regulator are activated by means of their parameters. When the function is enabled
(P82=3) and P78=1, the input manages the heating set point temperature directly; when P78=2, the input
manages the heating power input directly. Demand is activated above 3V and the heating setpoint is calculated in
proportion to deviation from 3 to 10 V DC, to give a setpoint that goes from minimum to maximum.
0-10V DC Electrical Signal Input
(V)
0...3
10
buttons on boiler control panel.
S
10k Ω
Indirect DHW Tank
Sensor Wiring
(125F Unit ONLY)
Heating Flow Setpoint Temperature
3
4
5
6
7
8
9
ACCESSORIES
Note
P78=1
(°F) (°C)
77 25
95 35
108 42
124 51
140 60
154 68
167 75
176 80
27
Parameter PO3 for Heating Only boiler, with
no 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.
Indirect DHW Tank
End Switch Wiring
P78 = 2
Central Heating - Heat Input (Gross)
(kW)
OFF
4.9
8.4
12.0
15.4
18.5
22.2
25.3
27.4
PN 240012875 REV. A [01/31/2020]
(Btu/h)
16,650
28,900
40,800
52,400
63,050
75,650
86,200
93,550