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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
Step
Parameter
Location
Parameter Description
1
Adjust >>
System
Outdoor Sensor Source
Select appropriate source: Not Installed, Wired, Wireless, or
Modbus.
Warm Weather
Shutdown Enable/
Disable
Selecting Enable will restrict boiler start during warm
weather, but only if an outdoor sensor is installed.
2
Adjust >>
Modulation
Boiler Model
WARNING!
Confirm correct boiler model is shown. Stop installation and
contact factory if incorrect boiler model is shown.
3
Adjust >>
Pumps
Boiler Pump
Ensure pump parameter selections are correct for your
application.
System Pump
Domestic Hot Water
Pump
4
Adjust >>
Service Contacts
Contractor
Enter contact information. In the event of a fault, or the need
to adjust a setting, the display will direct the user to the
entered contact.
Service Company
Sales Representative
5
Adjust >>
Central Heat
Setpoint
Ensure target space heating water temperature (Setpoint) is
correct for your type of radiation.
6
Adjust >>
Domestic Hot
Water
Setpoint
Ensure target domestic hot water temperature (Setpoint) is
correct.
DHW Modulation
Sensor
If using DHW Sensor, select DHW Sensor.
7
Adjust >>
Outdoor Reset
Enable/Disable If not using an outdoor sensor, select Disable.
8
Adjust >>
Sequencer
Master
Sequencer Master
If boiler is the master boiler in a multiple boiler installation,
select Enable.
9
Adjust >>
Sequencer Slave
Boiler Address
If boiler is a slave boiler in a multiple boiler installation,
assign a unique boiler address.
10
EMS >>
Modbus Setup
EMS Enable/Disable
If boiler is connected to an energy management system,
select Enable.
11
EMS >> Remote
Demand
Modulation Source If using an external multiple boiler controller, set to 4-20 mA.
Central Heat Setpoint
Source
If an Energy Management System is sending a remote
setpoint to the boiler, set to 4-20 mA.
Table 9-10: Control Parameter Checklist
9 System Start-up (continued)
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