Lochinvar SMART SYSTEM 502 - 2072 - Manual (Page 15)

15
Viewable and changeable control parameters
A: General
A1: User code
The User Code allows the user to access and change a limited
number of control parameters. The access code can be changed
by the user or the installer to a code of their choosing. To
change the code, parameter A1 must be accessed. The default
code is 0704. The code can be changed one digit at a time by
using the arrow keys on the display.
A2: Date and time
The control uses an internal clock for the night setback feature
and for logging of events. For these features to work correctly,
the clock must be set when the unit is first installed or any time
the unit has been powered off for more than 30 days. To set
the clock, parameter A2 must be accessed. The date and time
are displayed as “YY:MM:DD W hh:mm”. YY = year, MM =
month, DD = date, W = day (1 = Monday, 2 = Tuesday, etc.),
hh = hour (24 hour time; 2:00 PM = 14:00), mm = minutes.
Example: Monday ON: 22:30, Tuesday OFF: 6:45. If you wish
to skip a day and have no night setback, set the on and off times
to the same time, and prior to 12:00 p.m. To keep night setback
active through the entire day, set the on and off time to the same
time, and after 12:00 p.m. The default times for each day will be
08:00 (OFF) and 18:00 (ON).
A7: DHW Night setback offset
Once the internal clock has been set correctly, the DHW night
setback feature can be used to program a lower SH set point
during various times of the week. The value of this parameter
will be subtracted from the normal set point to determine the
set point used during night setback. This parameter can be
changed by the user or installer by accessing parameter A7. The
temperature range for this parameter is 0°F to 90°F (50°C). The
default value is 0°F.
A8: DHW Night setback times
If parameter A7 is set to anything other than 0°F, the DHW
night setback feature becomes active. This will require start
and stop times to be programmed for the days that reduced
temperatures are required. These times can be changed by the
user or the installer by accessing parameter A8. Each day of the
week (Monday through Sunday) will have an on and off time. If
you wish to skip a day, set the on and off times to the same time,
and prior to 12:00 p.m. To keep night setback active through
the entire day, set the on and off times to the same time and
after 12:00 p.m.
B: Temperature settings (boiler only)
B1: SH Set point user
The SH set point user sets the water temperature or pool
temperature set point for fixed operation, or the maximum
temperature set point when the outdoor air sensor is used.
This parameter can be changed by the user or the installer
by accessing parameter B1. The temperature range of this
parameter is 60°F (15°C) to 230°F (110°C). The default value
is 80°F (27°C).
B2: SH Minimum set point
The SH minimum set point sets the minimum water temperature
set point that can be used for space heating and pool heater
operation. The user or installer will not be able to program
the control with a lower SH set point. This parameter can only
be changed by the installer by accessing parameter B2. The
temperature range of this parameter is 32°F (0°C) to 230°F
(110°C) (space heating) or 32°F (0°C) to 105°F (40°C) (pool
heater). The default value is 70°F (21°C).
CAUTION
Before changing parameters, note the
settings so that the unit can be returned to
its original operating parameters.
1
Service
(continued)
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.
A3: Software version
The software version allows the user to view the software version
in use by the control. This software controls the operation of
the unit. When a new software version becomes available, the
existing control can be replaced with a new control to update
the software.
A4: Temperature units
The control can be configured to display temperature in either
°C or °F. This parameter can be changed by the user or the
installer by accessing parameter A4. The default is °F.
A5: SH Night setback offset
Once the internal clock has been set correctly, the SH night
setback feature can be used to program a lower set point. The
value of this parameter will be subtracted from the normal set
point to determine the set point used during night setback.
This parameter can be changed by the user or the installer
by accessing parameter A5. The temperature range for this
parameter is 0°F to 90°F (50°C). The feature is turned off with
a setting of 0°F. The default value is 0°F.
A6: SH Night setback times
If parameter A5 is set to anything other than 0°F, the night
setback feature becomes active. This will require start and stop
times to be programmed for the days that reduced temperatures
are required. These times can be changed by the user or the
installer by accessing parameter A6. Each day of the week
(Monday through Sunday) will have an on and off time.
Copper-fin II/IIE Boiler, Water Heater and Pool Service Manual