tekmar 444 Mixing Expansion Module - Manual (Page 3)

3 of 4 © 2007 D 444 - 04/07
The system pump contact operates based on the settings
of the tN4 thermostats connected to the same tN4 bus as
the 444.
When a tN4 Thermostat calls for the first stage of heat,
and the Mixing Expansion Module is connected to the
same tN4 bus, then the “Heat 1 Pump” and the “Heat 1
Pump Delay” settings affect the Mixing Expansion Module’s
system pump operation.
The system pump turns on together with the thermostat
call for heat when “Heat 1 Pump” is set to On and “Heat 1
Pump Delay” is set to Off.
The system pump turns on after a 3 minute delay from the
thermostat call for heat when “Heat 1 Pump” is set to On
and “Heat 1 Delay” is set to On.
In cases where the tN4 Thermostat calls for the second
stage of heat, and the Mixing Expansion Module is located
on the second stage tN4 bus, then the “Heat 2 Pump”
and the “Heat 2 Pump Delay” settings affect the Mixing
Expansion Module’s system pump operation.
System Pump Operation
Remove the module cover to locate the DIP switches.
Actuator / Variable
Select the Actuator / Variable DIP switch to Variable
to operate a variable speed injection pump. Select the
Actuator / Variable DIP switch to Actuator to operate a
floating action mixing valve or provide an analog signal
output 0-10 V (dc), 2-10 V (dc), 0-20 mA, 4-20 mA.
DIP Switch Settings
0-10 V (dc)
Actuator
2-10 V (dc)
Variable
0-10 V (dc) / 2-10 V (dc)
This DIP switch only applies if the Actuator / Variable DIP
switch is set to Actuator. This DIP switch position does not
apply when using a floating action motor.
Select the 0-10 V (dc) / 2-10 V (dc) DIP switch to 0-10 V (dc)
to operate a 0-10 V (dc) device. (Cut jumper for a 0-20 mA
device).
Select the 0-10 V (dc) / 2-10 V (dc) DIP switch to 2-10 V (dc)
to operate a 2-10 V (dc) device. (Cut jumper for a 4-20 mA
device).
LED Status Indicators
Power LED
• Green: Normal operation.
• Off: No power to the Mixing Expansion Module.
tN4 LED
• Solid Green: The Mixing Expansion Module established
tN4 communication to a tN4 System Control.
• Flashing Green: Attempting to establish communication
with tN4 System Control. This is normal for the first 3 minutes
after power is turned on.
• Off: There is no tN4 communication to a tN4 system
control.
System Pump LED
• Green: The system pump relay is on.
• Off: The system pump relay is off.
Mix % Out Bar Graph LEDs
The number of bar graph LEDs flashing or on solid indicate
the mixing device output.
Mix %
Output
0-33 % 34-66 % 67-99% 100%
LED 3 Off Off Flash On
LED 2 Off Flash On On
LED 1 Flash On On On
Mix % Out
tN4
Power
System Pump