44
Toolbox Menu
The Toolbox Menu logs all error codes from the VERSA and PIM, as well as other functions. Up to 15 error codes
can be logged.
Table W: Toolbox Menu
Outdoor Reset Concept
The Temperature controller can change the System
Set Point based on outdoor temperature (Outdoor
Reset). The temperature controller varies the temper-
ature of the circulating heating water in response to
changes in the outdoor temperature. The heating
water temperature is controlled through the modula-
tion and/or sequencing of the cascade.
The Temperature controller can also control the sys-
tem circulating pump with an adjustable Outdoor
Cutoff. When the outdoor temperature is above the
Outdoor Cutoff, the pump is turned off and no heating
water is circulated through the system. When the out-
door temperature drops below the Outdoor Cutoff, the
system pump relay is activated and the heating water
circulates through the system. The temperature of the
heating water is controlled by the Reset Ratio, Water
Offset, and changes with the outdoor temperature.
Reset Ratio/Outdoor Reset
When a building is being heated, heat escapes
through the walls, doors, and windows to the colder
outside air. The colder the outside temperature, the
more heat escapes. If you can input heat into the build-
ing at the same rate that it is lost out of the building,
then the building temperatures will remain constant.
The Reset Ratio is an adjustment that lets you achieve
this equilibrium between heat input and heat loss.
The starting point for most systems is the 1.00
(OD):1.00 (SYS) (Outdoor Temperature: Heating
Water Temperature) ratio. This means that for every
degree the outdoor temperature drops, the tempera-
ture of the heating water will increase one degree.
With the VERSA, both ends of the slope are
adjustable. It is factory set at 70
°
F water temperature
(Boil START) at 70
°
F outdoor air (OUT START), and
180
°
F water temperature (Boil DESIGN) at 10
°
F out-
door air (OUT DESIGN).
Each building has different heat loss characteristics. A
very well insulated building will not lose much heat to
the outside air, and may need a Reset Ratio of 2.00
(OD):1.00 (SYS) (Outdoor: Water). This means the
outdoor temperature would have to drop 2 degrees to
increase the water temperature 1 degree. On the other
hand, a poorly insulated building may need a Reset
Ratio of 1.00 (OD):2.00 (SYS). This means that for
each degree the outdoor temperature dropped the
water temperature will increase 2 degrees. The
VERSA control Reset Ratio allows for full customiza-
tion to match any buildings heat loss characteristics.
A heating curve that relies not only on Outdoor temper-
ature but also on the type of radiation will improve heat
comfort. The user can fine tune these adjustments
based on the specific building need.
Item
Description
Lookup Active Error Look up and display the active error info.
USER TEST
Select ON to start the function. The setting returns to default after the test is run.
(See Page 47 for details.)
MAX HEAT
Select ON to start the function. The setting will time out to OFF after 24 hours or can
be set to OFF again by the user. (See VERSA IC Applications Guide for details.)
P/N 104901
Software number of the Raypak VERSA
DEFAULTS
Resets to factory settings. Press UP and DOWN for 1 second to show CLR and load
factory defaults to all settings. This will also clear all history.
HISTORY
lookup logged error
Displayed when an error code is present. 1 indicates the most recent error code.
Press UP and DOWN for 1 second to clear the error logs.
