A. programming the vision i option, B. vision 1 program access, C. vision 1 program navigation – HTP MC120 User Manual
Page 63
63
LP-171 Rev. 4.10.14
water heater is satisfied, the Vision I system will switch back to the central heating circuit to continue to heat the living space at a
temperature based on outside temperature. This gives you a higher comfort level and further increases heater efficiency.
A. PROGRAMMING THE VISION I OPTION
The Vision I option allows the installer to set the system limits and heat curve for the heater. These system limits should not be changed
by the user. For future reference, it is important to document your settings within this manual after you program the system parameters.
B. VISION 1 PROGRAM ACCESS
Press and hold
{S3}
and
{S4}
simultaneously for three seconds to begin. You will notice that the display will change to
|000|
. Then,
press down
{S1}
until you see
|925|
on the display. This is the pass code. Press and hold
{S3}
for 1 second to confirm the pass code is
correct. If the pass code is entered incorrectly, the controller program function will be cancelled and the control returns to normal
operation. If the code is entered correctly, the control will switch off the gas valve and purge fan while showing a solid
|---|
in the display.
The display will than show a
|1|
alternating to
|de|
. This first function verifies that the control will address the requirements of the indirect
water heater.
C. VISION 1 PROGRAM NAVIGATION
Next you will have to press
{S3}
to move through each function. To increase or decrease a value, you will need to press either
{S1}
or
{S2}
to change the default values. If there is no key action for 1 minute, the display returns to normal operation. Changes are effective
immediately but not directly stored until the
{S4}
key is pressed down for 3 seconds then the new values are stored. Listed below are
the varieties of functions the installer can program into the Vision I System.
NOTE: The heater cannot be programmed when there is a call for heat. See Table 12 in Part 13 to set outdoor reset curve.
START-UP PROCEDURES WITH VISION 1 OPTION
DEFAULT
FUNCTION
FUNCTION
VALUE
DESCRIPTION
1
de
Not Applicable
2
149
o
F
Not Applicable
3
160
o
F
Maximum domestic delivery water temperature set point the installer will program for indirect water heater. (NOTE:
Does not apply if used with mechanical control).
Range: 95
o
F to 160
o
F.
4
36
o
F
Not Applicable
5
7
o
F
Allows the installer to change the differential in the indirect water heater. (Does not apply if used with mechanical
control.)
Range: 1
o
F to 18
o
F.
6
0 Min.
Allows the installer to change the indirect circulator post purge time once the sensor is satisfied. (NOTE: It is
recommended that circulator post purge time be set no greater than 5 minutes.
Range: 0 to 60 minutes.
7
68
o
F
Outdoor temperature that you wish the central heating should be disabled – (warm weather shutoff).
Range: 41
o
F to 122
o
F.
*8
5
o
F
Changes the minimum outside design temperature.
Range: -49
o
F to 32
o
F (See Table 12 to set outdoor reset curve.)
*9
180
o
F
Changes the design supply water temperature based on the minimum outside design temperature.
Range: 77
o
F to 180
o
F.
*10
68
o
F
Changes the maximum outside design temperature for central heating.
Range: 95
o
F to 32
o
F.
*11
95
o
F
Changes the design supply water temperature from the heater based on the maximum outside design temperature.
Range: 32
o
F to 180
o
F.
12
68
o
F
Sets the lowest temperature on heater for central heating.
Range: 32
o
F to 180
o
F.
13
0 Min.
Changes the central heating circulator post purge time once the thermostat is satisfied.
Range: 0 to 10 minutes.
14
30 Min.
Sets the maximum run time for the indirect water heater and the minimum run time for central heating.
Range: 0 to 60 minutes.
15
0
Bus address (0=zone master 1-8=cascade slave). (Not currently used.)
16
0
Interface Board Activation
0 = not active, 1 = active
WARNING: Never change the default setting without the heater interface board installed.
17
0
Interface Board Function
0 = Building Management, 1 = Enables Tekmar Modulating Control.
(Consult with Tekmar to assure the Tekmar Control is compatible.)