tekmar 275 Boiler Control - Manual (Page 44)

© 2012 275_D - 11/12 44 of 48
Testing the Control
Test Press and Hold
for 1 second
The control has a built-in test routine that tests the main
control functions. The control continually monitors the
sensors and displays an error message whenever a fault
is found. The individual outputs and relays are tested using
a test sequence.
Test Sequence
Each step in the test sequence lasts 10 seconds.
Start the test sequence by pressing the Test button.
Pause the test sequence by pressing the Test button
again. To advance to the next step, press the Test
button again.
If the test sequence is paused for more than five minutes,
the control exits the entire test routine.
To advance to a particular step, repeatedly press and
release the Test button to display the appropriate device.
HAZARD
•
•
•
•
Access to the Test button requires the removal of the
front cover and exposes hazardous voltage while the
control is powered. Only trained, qualified and competent
personnel should operate the Test button.
IF Boiler 1 = Auto
(repeat for each boiler set to Auto or CP1)
Step 4 Relay 1 is closed for Boiler 1 Pump or Boiler
1 Ignition. Boiler 1 modulates up to the STRT
MOD 1 setting according to the MOTR SPD
1 setting. The boiler is operated for the Fire
Delay 1 time or at least 10 seconds.
IF a demand is present
Step 5 Boiler 1 modulates up to the MAX MOD
1 setting according to the MOTR SPD 1
setting.
Step 6 Boiler 1 modulates down to 0% according
to the MOTR SPD 1 setting, and then Relay
1 is opened.
IF DHW mode = 1, 2, 5, or 6, the primary pump is
turned off
Step 7 The DHW relay is closed.
The C.A. / Alert relay is opened
The primary pump is turned off
The control exits the test sequence.
If a device fails to operate during the test sequence, refer
to the installation section of this brochure to check the
operation of the control. If the control works properly,
refer to any troubleshooting information supplied by the
equipment manufacturer.
Max Heat
The control has a function called Max Heat. As long as
there is a demand for heat the control operates in this mode
for up to 24 hours or until the Test button is pressed. tN4
devices operate to meet their occupied setting +5°F (3°C)
and display the MAX segment to indicate the Max Heat
mode. Use this mode to run the circulators during system
start-up to purge air from the piping.
When a boiler demand is present the control targets Boiler
Maximum. If Boiler Minimum = Off, the control then targets
Boiler Design. This allows the Boiler Maximum setting to
be set higher for DHW generation.
When a DHW demand is present the control targets the
lower of Boiler Maximum or DHW Exchange.
The Boil Maximum setting and DHW Exchange setting
are always available in the Adjust Menu when in Max
Heat. The Boiler Design setting is also available in the
Adjust Menu when in Max Heat and the Boiler Minimum
is set to Off.
DHW priority and WWSD are disabled.
To enable Max Heat:
Press and hold the Test button for more than 3 seconds
and less than 6 seconds and the test LED will begin to
flash rapidly. MAX HEAT and TEST are displayed on
screen. No outputs are turned on until there is a demand
for heat present.
Test Press and Hold
for 3 seconds
To Cancel Max Heat:
Press the Test button to cancel Max Heat manually or wait
24 hours and the control will automatically leave the Max
Heat mode.
Zone Test
In Zone Test mode, each tN4 device can be individually
turned on one at a time. The control tests each zone for up
to 5 minutes of no button activity. Use this feature to purge
air out of each zone and assist in troubleshooting. No items
are available in the user interface of the control.
•
•
•
•
Step 1 IF the RELAY item is set to ‘Damper’ or ‘Alert’
the C.A. / Alert relay is closed.
IF the RELAY item is set to ‘Alert’, the C.A. /
Alert relay is opened after 10 seconds
Step 2 The Primary Pump 1 relay is closed.
IF Pump Sequencer DIP is set to On, the Primary
Pump 1 relay is opened after 10 seconds.
IF Pump Sequencer DIP = On
Step 3 The Primary Pump 2 relay is closed.