tekmar 269 One Stage Steam Control - Manual (Page 8)

Copyright © D 269 - 06/00 8 of 12
Connect the control
Turn the power off and make sure all test jumpers have been removed from the plugs.
Connect the plugs to the control by carefully aligning them with their respective headers and pushing them upwards into the
headers. The plugs should snap firmly into place. The control is now ready for setup and operation.
Caution
The tekmar One Stage Steam Control 269 is an operating control and is not certified or intended for use as
a safety device. Under no circumstances should safety limit devices be left disconnected after installation
of this control. The installer shall check all applicable code requirements and obtain necessary inspections
to ensure that the installation is in compliance with those requirements.
Test the Boiler
Make sure power to the Boiler circuit is off and install a jumper in the terminal plug between the Boiler (7 and 8) terminals. When
the Boiler circuit is powered-up, the Boiler should operate. If it does not come on, check the circuit wiring for errors and ensure
that it is powered up and the voltage is correct. Check the devices in the circuit (limits, low water cut off, etc.) for faults. If the
Boiler operates properly when the circuit is powered up, disconnect the power, remove the jumper and proceed to the next step.
Step Five Testing the wiring
Caution
• These tests are to be performed using standard testing practices and proce-
dures and should only be carried out by a properly trained and experienced
technician.
• Before applying power to the control for testing, each terminal plug must be
unplugged from its header on the control. Pull straight down to unplug.
• A good quality electrical test meter, capable of reading from at least 0 — 200
Volts AC, and at least 0 — 1,000,000 Ohms, is essential to properly test this
control during installation.
Test the Sensors
• These tests must be made before turning on the power supply, and with the
terminals unplugged.
• The sensors are to be tested according to the instructions in Brochure D 001.
Test the Power supply
Make sure exposed wiring or bare terminals are not in contact with any other wires
or grounded surfaces. Turn on the power to the control and use an AC voltmeter
to measure the voltage between terminals
N — L (1 and 2). Between 105 and 125
Volts AC should be measured at these terminals.
Test the Warning device
If a Warning device is connected to the Warn. (3 and 4) terminals; make sure
power to the circuit is off and install a jumper in the terminal plug between terminals
3 and 4. When the Warning device circuit is powered-up, the Warning device
should operate. If it does not come on, check the circuit wiring for errors and
ensure that it is powered up and the voltage is correct. If the Warning device
operates properly when the circuit is powered up, disconnect the power, remove the
jumper and proceed to the next step.
Terminal plug pushed into
its header on the control
Test the Auxiliary device
If an Auxiliary device is connected to the Aux. (5 and 6) terminals; make sure power to the circuit is off and install a jumper in
the terminal plug between terminals 5 and 6. When the Auxiliary device circuit is powered-up, the Auxiliary device should operate.
If it does not come on, check the circuit wiring for errors and ensure that it is powered up and the voltage is correct. If the Auxiliary
device operates properly when the circuit is powered up, disconnect the power, remove the jumper and proceed to the next step.
9 10 11 13 12 14 15
Com
Sen Uno
Sw Out
Sen
10 K
S1
Com
Sen 10 K
S2
Cnd
Sen
Settings
Step Six Essential control settings
For specific application details refer to Application Brochure A 269-1 or A 269-2.
Cycle Length dial
This dial is used to set the length of the Heating Cycle from 1 to 100 minutes. The installer must have
knowledge of the system operating characteristics in order to determine the optimum Cycle Length. If the
Heating Cycle is too short, the system may not come up to operating pressure or temperature before it is
shut down, causing inefficient operation of the boiler and uneven heating through the system since the
furthest radiators from the boiler may not get hot enough. Too long of a Cycle Length will lead to wider air
temperature swings in the building, creating discomfort for the occupants. In most systems, trial and error
is the only way that the correct Cycle Length can be determined, and the installer must be willing to manually
operate the system through a number of cycles before this setting can be finalized. A cycle time of between
30 and 60 minutes should be used as a trial setting
(settings below 10 minutes are for testing purposes only).
1
50 min
100
10
Cycle Length
Terminal plug disconnected
from its header on the control
9 10 11 13 14 15
Com
Sen Uno
Sw Out
Sen
10 K
S2
Com
Sen Cnd
Sen
12
10 K
S2