Raypak XTherm Series Installation & Operating Instructions Manual page 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 for a maximum of 24 days
Item
Lookup Active Error
USER TEST
MAX HEAT
P/N 104901
DEFAULTS
HISTORY
lookup logged error
Outdoor Reset Concept
The Temperature controller can change the System
Set Point based on outdoor temperature (Outdoor
Reset). The temperature controller varies the tem-
perature 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
system 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 building 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 equi-
librium between heat input and heat loss.
Description
Look up and display the active error info.
Select ON to start the function. The setting returns to default after the test is run.
(See Page 49 for details.)
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 Manual for details.)
Software number of the Raypak VERSA
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.
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.
Table V: Toolbox Menu
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 adjust-
able. 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 outdoor 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 tem-
perature but also on the type of radiation will improve
heat comfort. The user can fine tune these adjust-
ments based on the specific building need.
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