Steffes 2100 Series Installation

THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED TECHNICIAN
2100 Series room heaters have onboard temperature sensing and control. In some applications, the system
owner may want to use a low voltage thermostat. While either a single stage or 2-stage thermostat may be
used, Steffes strongly recommends using a 2-stage thermostat.
When using a low voltage thermostat there are only one or two speeds available for air discharge and target
output temperatures. The blower will run at the selected speed regardless of core temperature.
With a single stage thermostat, the blower will run at the speed selected in Location 29 (L029) and have the
output target temperature selected in Location 49 (L049).
When using a 2-stage thermostat, the blower will run at the speed selected in Location 28 (L028) and target
the output temperature selected in Location 48 (L048) with a stage 1 heat call. It will run at the speed
selected in Location 29 (L029) and target the output temperature selected in Location 49 (L049) with a
stage 2 heat call.
NOTES: A separate 24VAC source is required to operate the
thermostat and provide signal voltages to heaters.
The number of heaters controlled using this application
is limited by the ratings of the power source and
thermostat. The current draw of each input is .015A.
Heaters with version 2.02 or lower are only capable of
running in a single stage configuration. If a 2-stage
configuration is desired the processor control board
must be replaced.
INSTALLATION WITH WHITE AND WHITE/BLACK WIRES
To configure the heater to operatewith a low voltage thermostat perform the following:
1. Mount the thermostat in the desired location and connect
wiring in the manner which is appropriate for the
application according to Figures 1 and 2.
2. Version 2.02 or lower only: Disconnect one of the wires
from the fan resistor on each heater.
Version 2.04 or higher only: Remove the 2-bit from the
value in Location 35 (L035). Unless other changes to the
heater's configuration have been made, the new value will
be 152.
3. Set the value in Location 3 (L003) to a value of 32 to
desplay heat call status or a value of 16 to display outdoor
temperature.
4. Set the values in Location 28 (L028), 29 (L029), 48, (L048),
and 49 (L049) as shown in Table 1.
OPERATION
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LOW VOLTAGE
THERMOSTAT
INSTALLATION
FOR 2100 SERIES
WARNING
HAZARDOUS VOLTAGE:
Risk of electric shock. Can
cause injury, or death. System
may be connected to more than
one branch circuit. Disconnect
power to all circuits before
servicing.
Table 1
Document #1206108 Rev 7
03/19/2024