WaterFurnace Envision Hydronic (NSW) - Manual (Page 31)

31
NSW INSTALLATION MANUAL
Standard Control - Panel Confi guration cont.
Remote Aquastat Secondary Mode (Y1)
In secondary mode the compressor output is determined by an external aquastat. The compressor shall engage 10 seconds
after the Y1 call has been received. The compressor shall de-activate 10 seconds after the Y1 has been removed. The
secondary output is controlled by a Derivative Controller. If the change in the water temperature is less than a selected
value (d) in a selected period of time (P), the secondary output shall activate.
Parameter Functions and Settings
Parameter Function Description
Factory
Setting
Range Increments
SC
Calibrate
the Water
Sensor This will allow the temperature displayed to be
adjusted to match a temperature reading from an
external source.
0°F -9° to 10° 1
dB
Dead Band
(Heating) This parameter is used to determine when
the compressor should be activated. If the
temperature is below the setpoint minus the dB
value (in heating mode) then the compressor will
activate. The cooling deadband is fi xed at 5°F
and non-adjustable.
1°F 1° to 15° 1
CF
Celsius/
Fahrenheit
Selection This parameter selects the units for which the
temperature will be displayed.
F F or C N/A
FP
Freeze
Detection There are three settings for this parameter; OL,
CL, and P. OL is the open loop setting which
corresponds to 32°F (0°C). CL is the closed loop
setting which is 15°F (-9°C). P is the process
setting which is 5°F (-15°C).
32°F P,CL,OL N/A
SL
Primary/
Secondary
Setting Primary mode utilizes an internal aquastat to
determine the activity of the compressor. In
secondary mode the compressor output is
determined by an external aquastat.
0
(Primary)
0 or 1
1 = Secondary
0 = Primary
IC
Initial
Condition This parameter is used to determine the state of
the secondary output of the primary unit. If the
actual water temperature is greater than the IC
value away from the set point, the secondary
output will be activated.
10°F 0° to 20° 1°
d
Derivative This parameter is used to determine the state
of the secondary output of the primary and
secondary unit. If the change in temperature is less
than the d value the secondary output will activate.
1°F 0° to 5° 1°
P
Period This determines how often the derivative will
be calculated.
5 min 1 to 5 min 1 min
PS
Pump
Sampling
Time
Selection This parameter determines how long the pump
is activated before the controller takes a sample
of the water temperature. The range of this
parameter is from 1 to 5 minutes and is factory
set to 3 minutes. The pump can also be set to run
continuously when PS is set to C.
3 min
1 to 5 min
or C
1 min
Fd
Freeze
Detection
Display This displays the current temperature of the
freeze detection sensor.
N/A 0° to 130° N/A