tekmar 664 Snow Detector & Melting Control Installation - Manual (Page 29)

29 of 36 © 2009 D 664 - 07/09
The Snow Detector and Melting Control 664 has a built-in test routine which
is used to test the main control functions. The 664 continually monitors the
sensors and displays an error message whenever a fault is found. See the
following pages for a list of the 664’s error messages and possible causes.
When the Test button is pressed, the test light is turned on. The individual
outputs and relays are tested in the following test sequence.
Testing the Control
Menu Item
Menu Item or
TEST SEQUENCE
Each step in the test sequence lasts 10 seconds.
During the test routine, the test sequence is paused by pressing the Test button. While paused, the control displays the testing step
as well as the word PAUS. If the Test button is not pressed again for 5 minutes while the test sequence is paused, the control exits
the entire test routine. If the test sequence is paused, the Test button can be pressed again to advance to the next step. This can also
be used to rapidly advance through the test sequence. To reach the desired step, repeatedly press and release the Test button until
the appropriate device and segment in the display turn on.
Step 1 If FLOT is selected in the MIXING item, the mixing valve is run fully open in the time set by the MOTR SPD item. If VAR
is selected in the MIXING item, the injection pump is ramped up over 10 seconds. If 4-20 is selected in the MIXING item,
the 4-20 mA device is modulated up in the time set by the MOTR SPD item.
Step 2 If FLOT is selected in the MIXING item, the mixing valve is run fully closed in the time set by the MOTR SPD item. If VAR
is selected in the MIXING item, the injection pump is ramped down over 10 seconds. If 4-20 is selected in the MIXING
item, the 4-20 mA device is modulated down in the time set by the MOTR SPD item.
Step 3 If the Zone 1 item is set to AUTO, the Zone 1 contact (Zn 1) is turned on for 10 seconds. After 10 seconds the Zone 1
contact (Zn 1) is turned off.
Step 4 If the Zone 2 item is set to AUTO, the Zone 2 contact (Zn 2) is turned on for 10 seconds. After 10 seconds the Zone 2
contact (Zn 2) is turned off.
Step 5 The System Pump contact (Sys P1) is turned on for 10 seconds.
Step 6 The Stage 1 contact is turned on for 10 seconds
Step 7 If SUP is selected in the Boil SENS item, the Stage 2 contact is turned on for 10 seconds. After 10 seconds, the Stage 1,
Stage 2 and Sys P1 contacts are shut off.
MAX HEAT
The Snow Detector and Melting Control 664 has a function called Max Heat. In this mode, the 664 turns on and operates the system
up to the maximum set temperatures, and the mixing device at the set percentage. The control continues to operate in this mode
for up to 24 hours or until either the Item, Menu or Test button is pressed. This mode may be used for running all circulators during
system start-up in order to purge air from the piping. To enable the Max Heat feature, use the following procedure.
1) Press and hold the Test button for more than 3 seconds. At this point, the control displays
the words MAX HEAT and the word NO.
2) Using the
▲
or
▼
buttons, select the word YES. After 3 seconds, the control fl ashes the
word MANUAL and the number 100. This number represents the desired output from the
mixing device.
3) Set the desired output of the mixing device by using the
▲
and / or
▼
buttons on the
control.
4) To cancel the Max Heat mode, press either the Item, Menu, or Test button.
5) Once the Max Heat mode has either ended or is cancelled, the control resumes normal
operation.