Voyager SSV100-45R, Operating Manual

Page: 10 / 44

PAGE: 10 LP-41 REV: 3/1/03
SET POINT ADJUSTMENT PROCEDURE (CONTINUED)
To change or access the programmed temperature set point value, utilize the red button on the display panel. Momentarily depressing
the button will briefly illustrate the existing set point value. If the button is held down for more than one second, the programming mode
is entered and the set point value will begin incrementing by one degree per second. When the desired set point value is reached, sim-
ply release the button and the controller will automatically retain this value in temporary memory. After 30 seconds, this new set point
will be retained in permanent memory.
NOTE:
IF POWER IS INTERRUPTED DURING THIS 30 SECOND PERIOD, THE NEW SET POINT WILL NOT BE RETAINED IN PERMA-
NENT MEMORY. IT IS A GOOD PRACTICE TO RE-CHECK THE SET POINT VALUE APPROXIMATELY 60 SECONDS AFTER A
NEW VALUE HAS BEEN RE-ENTERED.
If the button is held down long enough, the set point will reach 160 degrees F. and stop, since this is its maximum value. At this point,
if the desired set point has not been obtained, release the button and depress it again, the set point will decrement down to 70 degrees
F. and stop. The set point value will now restart at 70 degrees F. (its minimum) and once again increase in value for as long as the
button is pressed.
DIFFERENTIAL ADJUSTMENT PROCEDURE
To allow proper water heater operation, the control has a 8 degree F. "window" around the set point. This means that the burner will
be turned on when the water temperature drops to 4 degrees F. below the set point, and it will be turned off when the water tempera-
ture reaches 4 degrees F above the set point. Thus, if the set point is set to 120 degrees F., the control will turn on the burner when
the water temperature drops to 116 degrees F., and will continue to heat the water until the temperature reaches 124 degrees F. The
differential is factory set to 8 degrees F. (+ or- 4 degrees F.) If another differential is required, the value of the differential can be field
adjusted by holding the set point button when power is applied to the control. Shut off power to the control. Next hold in the set point
button. Now reapply power to the control. Using the set point button, the value of the differential can be incremented or decremented
as above. When the proper value is reached, release the button and the new differential has been stored into permanent memory.
OVERALL APPLIANCE AND CONTROL OPERATION
A normal operating sequence is as follows:
1. The control determines that the actual water temperature inside tank is 4 degrees F., with the factory set 8 degree F.
differential, below programmed temperature set point;
2. The control performs selected system diagnostic checks;
3. If all checks are successfully passed, the combustion blower is energized for the 40 second pre-purge cycle;
4. During the pre-purge cycle is complete, power is applied to the ignitor element for the ignitor warm-up period (blower should
continue to run);
5. The ignitor warm-up period will last for 30 seconds, then gas valve will be opened, allowing gas to enter the burner chamber;
6. The ignitor will remain on for an additional 4 seconds, then it will be turned off;
7. After an additional 2 seconds, the control will verify the presence of flame. If the flame was not established, the gas valve will
be closed, power will be removed from the ignitor element, and the control will run the blower for 30 seconds. At this point,
the control will return to step 2;
8. If flame is present, the control will enter the heating mode where it will continue heating the tank water until the set point
temperature plus 4 degrees F. is reached. At this point, the gas valve is closed and the control enters the post-purge cycle.
The flame can be viewed through a window on the lower right of combustion blower flange;
9. The post-purge cycle continues to run the combustion blower for an additional 30 seconds to purge the system of all
combustion gases. After this time period, the blower is de-energized and will coast to a stop;
10. The control will now enter the idle state while continuing to monitor internal tank water temperature. If the temperature drops
to 4 degrees F. below the set point value, the control will automatically return to step 1.