User Guide

15
EM-40-SM Service Manual
Note: DIP switches are located on the front of the control.
(A) Factory / Installer
The Factory / Installer DIP switch is used to select which
items are available to be viewed and / or adjusted in the
u
ser interface. The Factory Access Level includes all
the settings available in the control. The Installer Access
Level includes the settings and items which are required
for system setup.
(B) Not Used
DIP Switch Settings
Control Settings
Applications
Mode 1 and 2 – Two Setpoint Operation
Mode 1 – Two Setpoint Operation with Parallel Piping
The control receives a heat demand pro
vided from z
one
valve end switches or a switching relay end switch. The
control turns on the boiler pump and operates the burners
to maintain the setpoint boiler target 1 temper
ature at the
boiler outlet sensor whenever a heat demand is present.
The control receives a setpoint demand from a DHW
aquastat.
The control oper
ates the burners to maintain the
setpoint boiler target 2 at the boiler outlet sensor whe
never a setpoint demand is present.
Note: An external relay is required to operate the DHW
pump and provide DHW priority if required by disabling
the boiler pump.
Mode 2 – Two Setpoint Operation with Primary /
Secondary Piping
The control receives a heat demand pro
vided from z
one
valve end switches or a switching relay end switch. The
control turns on the boiler pump and operates the burners
to maintain the boiler target 1 temper
ature at the boiler
supply sensor whenever a heat demand is present. The
control receives a setpoint demand from a DHW aquastat.
The control oper
ates the b
urners to maintain the setpoint
boiler target 2 at the boiler supply sensor whenever a
setpoint demand is present.
Note: An external relay is required to operate the DHW
pump and provide DHW priority if required by disabling
the system pump.
Factory Installer
OFF
OFF
B
A
BTC
Mode 1
Relay
Boiler Inlet Sensor
Boiler
Outlet
Sensor
BTC
Mode 2
Zone Box
Boiler Inlet Sensor
Boiler
Outlet
Sensor
Boiler
Supply
Sensor
Relay
Factory Installer
OFF
OFF
B
A
BTC
Mode 1
Relay
Boiler Inlet Sensor
Boiler
Outlet
Sensor
BTC
Mode 2
Zone Box
Boiler Inlet Sensor
Boiler
Outlet
Sensor
Boiler
Supply
Sensor
Relay
BTC
Mode 1
Relay
Boiler Inlet Sensor
Boiler
Outlet
Sensor
BTC
Mode 2
Zone Box
Boiler Inlet Sensor
Boiler
Outlet
Sensor
Boiler
Supply
Sensor
Relay