Lochinvar KNIGHT 399 - 800 - Manual (Page 55)

Installation & Operation Manual
55
Set domestic hot water (DHW) operation
Verify DHW circulator mode
The DHW Mode is programmed to heat an indirect domestic
hot water tank. When the tank thermostat calls for heat, the
SMART SYSTEM control will turn on the DHW pump and
turn off the boiler pump (if running). If the system pump is
running, it will remain on. When the DHW call for heat ends,
and there is no space heating call for heat, the DHW pump
will continue to run for a period of time. This pump delay is
set at the factory to 30 seconds. If a shorter or longer delay is
desired, the appropriate parameter in the control must be
changed. See the Knight XL Service Manual for a detailed
explanation of this procedure. If there is an active space
heating call for heat, then the boiler pump will be turned on
and the DHW pump will be turned off.
Set DHW target temperature
When in the DHW Mode, the control will modulate to
maintain the outlet temperature to a set point. This set point
is set at the factory to 180°F. If a different set point is desired,
the appropriate parameter in the control must be changed.
See the Knight XL Service Manual for a detailed explanation
of this procedure.
Set clock
The SMART SYSTEM control has a built-in clock that it uses
for its night setback feature and for logging events. This clock
must be set when the boiler is installed, and anytime the boiler
has been powered off for more than one month. Use the
following procedure to set the clock:
1. Press and hold the MENU key for at least 5 seconds.
2. The display changes to ready “ENTER MENU CODE”,
with four (4) zeros below it.
3. Change the zeros to match the user code (factory set at
“0704”). Use the UP and DOWN keys to
increment or decrement the flashing digit, and the NEXT
and PREVIOUS keys to select which digit flashes.
4. Press the ENTER key.
5. The display changes to read USER CODE for a few
seconds, then displays a menu.
6. Press the ENTER key.
7. Press the UP key twice to display “A3 DATE AND
TIME”.
8. Press the ENTER key once.
9. The date and time are displayed as “YY:MM:DD W
hh:mm”, where:
mm:
minutes
hh: hour (24 hour time; e.g., 2:00 PM = 14:00)
W: day of the week (1 = Monday, 2 = Tuesday,
3 = Wednesday, etc.,)
DD: date
MM: month
YY: year
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.
Use the UP and DOWN keys to increment or decrement the
flashing number, and the NEXT and PREVIOUS keys to select
which number flashes.
10. Press the ENTER key to save the setting.
11. Press the MENU key twice to exit the Programming
Mode.
Configuration of the cascade
When installed in a Cascade system, the individual controls
must be programmed for cascade operation. This is
accomplished by accessing the control parameters.
Input the Installer code as described in the Knight XL Service
Manual. Once the control parameters have been accessed, use
the DOWN arrow key to select the H Control Mode parameters.
Press the ENTER key to access these parameters. Use the UP
arrow key to access parameter H2 SH Source. Press the ENTER
key to access this parameter. Use the DOWN arrow key to select
Cascade. Press the ENTER key to program this into the control.
Press the UP arrow key to select the parameter H3 BLR Address.
Press the ENTER key to access this parameter. Each unit in the
Cascade system must be programmed with its own address. The
boiler designated as the Leader will have an address of 0. The
remaining boilers in the Cascade will be Members and have
addresses from 1 - 7. Use the UP and DOWN arrow keys to
select the appropriate address. Press the ENTER key to program
this into the control.
Press the MENU key twice to exit the control parameters. Repeat
this procedure for all boilers in the Cascade, designating the
Leader control and the Member controls.
10
Start-up
(continued)