Raypak XTherm 1005A Installation And Operation Manual page 45

4.10.6. Toolbox Menu
The Toolbox Menu logs all error codes from the VERSA and PIM, as well as other functions.
Item
Lookup Active Error
USER TEST
MAX HEAT
P/N 104901
DEFAULTS
HISTORY
lookup logged error
4.10.7. Outdoor Reset Concept
The Temperature controller can
Setpoint based on outdoor temperature (Outdoor Reset).
The temperature controller varies the temperature of the
circulating heating water in response to changes in the
outdoor temperature. The heating water temperature is
controlled through the modulation 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 outdoor 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 equilibrium between heat input
and heat loss. See Figure 54.
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 temperature of the heating water
will increase one degree. With the VERSA, both ends of
Look up and display the active error info.
Select ON to start the function. The setting returns to default after the test is run.
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 control manual (5000.72) 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 W. Toolbox Menu
change the System
Description
the slope are adjustable. It is factory set at 70°F (21°C)
water temperature (Boil START) at 70°F (21°C) outdoor air
(OUT START), and 180°F (82°C) water temperature (Boil
DESIGN) at 10°F (-12°C) 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 customization to match any buildings heat
loss characteristics.
A heating curve that relies not only on Outdoor temperature
but also on the type of radiation will improve heat comfort.
The user can fine tune these adjustments based on the
specific building need.
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