WaterFurnace Envision Hydronic (NSW) - Manual (Page 24)

24
NSW INSTALLATION MANUAL
Y1 = Compressor call
R = 24VAC
C
G
W1
L
X1
Y2
O
Y1
W2
S
X2
R
Control Box
Typical Aquastat
Secondary Unit
(SL=1)
Aquastat Wiring for Dedicated Heating or Cooling Unit
Y1 = Compressor call
O = Reversing valve call
R = 24VAC
Note: Jumper wire must be
moved to terminals 5 & 6.
Secondary Unit
(SL=1)
C
G
W1
L
X1
Y2
O
Y1
W2
S
X2
R
Typical Aquastat
1
2
3
4
5
6
7
8
9
10
11
12
Jumper
Wire
Control Box
Aquastat Wiring for Reversible Unit
External Control
Primary Mode
In dedicated heating or cooling units, the unit is controlled
by the internal controller. Compressor output is determined
by the entering load-side water temperature.
The secondary output will be energized if two
conditions occur:
1. The initial temperature is greater than IC away from the
set point.
2. The change in temperature in a given period of time P is
less than d.
In a reversible unit, the unit is controlled by the internal
controller. Compressor output is determined by the
entering load-side water temperature. For reversible units,
the jumper wire must be positioned across terminals 6 and
7, (factory default set to this position). Reversible units do
not have a secondary output.
NOTES: SL in the configuration menu must be set to 0,
(factory default). All parameters should be checked for each
application on primary unit, (refer to the parameter table).
Secondary Mode
In dedicated heating or cooling units, secondary mode
allows the unit to be controlled by an external source.
Compressor output is determined by the Y1 input only.
The secondary output will be energized after the following
condition occurs:
1. The change in temperature in a given period of time P is
less than d.
In reversible units, secondary mode allows the unit to
be controlled by an external source. Compressor output
is determined by the Y1 input and the reversing valve
is determined by the O input. In reversible units, the
jumper wire must be positioned across terminals 5 and 6.
Reversible units do not have a secondary input.
NOTES: SL in the configuration menu must be set to 1. P
and d must be setup for each secondary unit.
Wiring an Aquastat - Reversible Unit
• To create a secondary unit, set SL to 1 in the
configuration menu.
• Position the jumper wire in the control box across
terminals 5 and 6.
WARNING: Reversible units cannot be
staged.