Slant/Fin EM-10 Service Manual - Manual (Page 12)

12 EM-40-SM Service Manual
The installer should test to confirm that no voltage is
present at any of the wires during installation. The control
includes a 24 pin connector for ease of installation.
NOTE: Figure shown should be used for checking control
only. Boiler wiring diagram should be used for checking the
rest of boiler, because interface board has different terminal
numbers.
Powered Input Connections
24 V (ac) Power
Connect the 24 V (ac) power supply to the C and R
terminals. This connection provides power to
the microprocessor and display of the control. As well, this
connection provides power to the Alert terminal from
the R terminal.
Heat Demand
To generate a heat demand, a voltage between 24 V (ac)
and 120 V (ac) must be applied across the CD (common
demand) and the Ht D (heat demand) pins.
Setpoint Demand
To generate a setpoint demand, a voltage between 24 V (ac)
and 120 V (ac) must be applied across the CD (common
demand) and the Set D (setpoint demand) pins.
Caution: The same power supply must be used for both the
heat demand and setpoint demand circuits since they
share the CD (common demand) pin.
Output Connections
Boiler Pump Contact
The Pump pins are an isolated output in the control.
There is no power available on these pins from
the control. This output is to be used as a switch to either
make or break power to the boiler pump. Since this is an
isolated contact, it may switch a voltage between 24 V (ac)
and 120 V (ac).
Stage Contacts
Stage 1, Stage 2, Stage 3, and Stage 4 are isolated
outputs in the control. There is no power available
on these pins from the control. This output is to be used as
a switch to either make or break the stage circuits. When
the control requires the stage to fire, it closes the Stage
contact.
Alert Contact
The Alert pin on the control is connected to an audible alarm
on the interface board which sounds an alert when it senses
an open sensor circuit.
Sensor and Unpowered Input Connections
Do not apply power to these terminals as this damages
the control.
Boiler Outlet Sensor
Connect the two wires from the Boiler Outlet Sensor to the
Com/- (common sensor) and Boil O (boiler outlet sensor)
pins. The boiler outlet sensor is used by the control to meas-
ure the boiler outlet water temperature from the boiler.
Note: The boiler outlet sensor is required for every mode of
operation.
Boiler Inlet Sensor
Connect the two wires from the Boiler Inlet Sensor to the
Com/- (common sensor) and Boil in (boiler inlet sensor)
pins. The boiler inlet sensor is used by the control
to measure the boiler inlet water temperature from the boiler.
Note: The boiler inlet sensor is optional for every mode
of operation.
Boiler Supply Sensor
An optional Boiler Supply Sensor may be connected to the
control. If the sensor is required, connect the two wires from
the sensor to the Com (common sensor) and Sys/D (boiler
supply) pins.
Electrical Connections to the Control
Installation
11
10
9
8
7
6
5
4
3
2
1
12
+V(in)
Com/-
Boil in
Boil O
Sys/D
Out
Com
Set D
Ht D
CD
C
23
22
21
20
19
18
17
16
15
14
13
24
Alert
Stg 4
Stg 4
Stg 3
Stg 3
Stg 2
Stg 2
Stg 1
Stg 1
Pmp
Pmp
R
A OFF
B OFF