TriangleTube 399 Solo - Manual (Page 57)

51
Outdoor Reset Control
Summer / Winter Switch at Boiler
If required the CH (Central Heating) system can
be turned off at the boiler, similar to a manual
summer / winter switch by pressing and holding
the “+” button while in
the “StbY ” mode. The
display will show “ cOFF ”. Pressing and holding
the “+” button turns the CH system back on.
The display will show “c” followed by the CH
set point temperature.
If a parameter setting is changed but the
STORE button is not pressed to save the
setting, the MCBA will automatically
store the setting after 20 minutes. Ensure
all parameters are at their factory set-
tings or appropriately revised for the
application prior to commissioning the
boiler. Failure to comply could result in
erratic or unreliable operation of the
Prestige boiler.
Once a parameter setting has been
revised and stored pressing the STEP
button will display the setting of the next
parameter without showing P_XX. To
avoid confusion, it is advisable to contin-
ue pressing the STEP button until
Parameter 46 is reached. The next press
of the STEP button will cause the display
to roll over to Parameter 1. Continue
pressing the STEP button until the next
parameter to be adjusted is reached and
revise the setting.
Adjusting Outdoor Reset Curve
Parameters 4, 10, 11, & 12 define the settings
of the outdoor reset curve. See Graph 1 and
Table 3, page 53 for an example of modifying
the outdoor reset curve.
CH Maximum Boiler Operating Setpoint
(Parameter 4)
If an outdoor temperature sensor is not con-
nected to the boiler, the boiler setpoint for a
heating call will be set to the CH Maximum
Boiler Operating Setpoint. If an outdoor tem-
perature sensor is connected, the CH
Maximum Boiler Operating Setpoint becomes
the boiler setpoint on the CH Reset Curve
Coldest Day. The outdoor temperature can be
monitored on the boiler display via item 4 of
the INFO menu.
CH Minimum Boiler Operating Setpoint
(Parameter 10)
This parameter is not applicable if an outdoor
sensor is not connected to the boiler. When an
outdoor temperature sensor is connected, the
CH Minimum Boiler Operating Setpoint
becomes the boiler setpoint on the CH Reset
Curve Warmest Day.
CH Reset Curve Coldest Day
(Parameter 11)
This parameter is not applicable if an outdoor
sensor is not connected to the boiler. When an
outdoor temperature sensor is connected, the
CH Reset Curve Coldest Day is the coldest
design temperature of the heating system.
NOTICE
WARNING
Factory Setting
Minimum
Setting
Maximum
Setting
186ºF 86ºF 194ºF
Factory Setting
Minimum
Setting
Maximum
Setting
00ºF (-)22ºF 50ºF
Factory Setting
Minimum
Setting
Maximum
Setting
86ºF 60ºF 140ºF