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17
PC Program Instructions
6 Parameters (continued)
Figure 6-10 Parameter Set 4F
OA reset water temp at min outdoor temp (4FC) (Reset
T Lo Out)
When the outdoor air temperature drops to its minimum
setting (4FC), the water temperature setpoint will be at this
value. However, if the SH user setpoint (4AA) is lower, it will
override this setting. If the SH user setpoint is higher, the water
temperature setpoint will continue to climb as the outdoor
temperature drops below 4FC. This parameter can be changed
by accessing parameter 4FA. The temperature range of this
parameter is 0°F (-18°C) to 190°F. (88 °C). The default value is
180°F (82°C), (FIG 6-11, page 18).
OA reset water temp at max outdoor temp (4FD)
(Reset T Hi Out)
When the outdoor air temperature rises to or above its
maximum setting (4FD), the water temperature setpoint will be
at this value. This parameter can be changed by accessing
parameter 4FB. The temperature range of this parameter is 0°F
(-18°C) to 190°F (88°C). The default value is 70°F (21°C), (FIG
6-11, page 18).
OA reset outdoor temp at max water temp (4FA) (Out
T Hi Reset)
When the outdoor air temperature drops to this point, the water
temperature setpoint will be at the setting given by parameter
4FA (if not overridden by the SH user setpoint). This parameter
can be changed by accessing parameter 4FC. The temperature
range of this parameter is -30°F (-34°C) to 90°F (32°C). The
default value is 25°F (-4°C), (FIG 6-11, page 18).
OA reset outdoor temp at min water temp (4FB) (Out
T Lo Reset)
When the outdoor air temperature rises to or above this point,
the water temperature will be at its minimum setpoint. This
parameter can be changed by accessing parameter 4FD. The
temperature range of this parameter is -30°F (-34°C) to 90°F
(32°C). The default value is 70°F (21°C), (FIG. 6-11, page 18).
Ramp delay (Ramp delay)
This parameter configures the ramp delay feature from off to
on. This parameter can be changed by accessing parameter 4FE
(FIG. 6-10). The control range of this parameter is 0 = Off,
1 = Ramp Up Only, and 2 = Ramp Up and Ramp Down. The
default is 0.
No. of months for service reminder (Serv Not time)
When the boiler control determines that a scheduled service
is due based on days of installation, the boiler display will
show a “Maintenance Required” screen. This parameter is
adjustable by accessing parameter 4EA. The time range for
this parameter is 0 months to 36 months. The default time is
12 months.
Running hours for service reminder (Serv Not Run h)
When the boiler control determines that a scheduled service
is due based on the hours of actual operation, the boiler
display will show a “Maintenance Required” screen. This
parameter is adjustable by accessing parameter 4EB. The time
range for this parameter is 0 hours to 100,000 hours. The
default time is 10,000 hours.
Burner cycles for service reminder (Serv Not cycl)
When the boiler control determines that a scheduled service
is due based on the number of boiler cycles, the boiler display
will show a “Maintenance Required” screen. This parameter
is adjustable by accessing parameter 4EC. The range for this
parameter is 0 cycles to 100,000 cycles. The default is 10,000
cycles.
To adjust the Outdoor Air Reset curve, click on the tab labeled
4F OA Reset Curve (see FIG. 6-10 below).