WaterFurnace Envision Hydronic (NDW) - Manual (Page 17)

17
NDW INSTALLATION MANUAL
TB Typical T-Stat
24VAC
24V COM
Comp 1
Comp 2
Rev Valve
Acc 2
Acc 1
Alarm
Circuit 1 Alarm
Circuit 2 Alarm
24VAC
24V COM
Comp 1
Comp 2
Rev Valve
Accessory Item 1
R
C
Y1
Y2
O/B
X2
X1
L
LC1
LC2
R
C
Y1
Y2
B
NOTES:
1) Acc Output 1 is cycled with the lead compressor
2) Acc Output 2 is cycled with the lag compressor
Field Wiring and Control Setup
Figure 2 - High Voltage Connections
Figure 3 - Low Voltage Connections
Line Voltage
High Voltage Connections
Connect power wiring as shown in Figure 2.
208 Volt Operation
Switch red and blue transformer wires for 208V operation.
Low Voltage Operation
Thermostat/Controller (Aquastat)
A two-stage 24 VAC thermostat or liquid controller (field
supplied) must be used to turn the NDW on or off, and
to switch it from cooling to heating if necessary. Multiple
NDWs in the same bank must be controlled from one
thermostat/controller (must be isolation relays for multiple
unit applications).
Low Voltage Connections
Connect low voltage thermostat wiring as shown in Figure
3. Connections shown are for typical thermostat. Actual
connections may vary with specific device used.
NOTE: If a separate transformer is used to supply a Y1, Y2, or
B signal to the unit controls, isolation relays must be used.
CAUTION: Use only copper conductors for field
installed wiring. Terminals in the unit are not
designed for other types of conductors.
WARNING: All wiring must comply with local and
state codes. Disconnect the power supply before
beginning to wire to prevent electrical shock or
equipment damage.
NOTE: Accessory output is selectable as normally open or
normally closed using the unit display. Normally closed is
the factory default setting.
Source Flow Switch (SFS)
Unit is factory shipped with jumpers on the Source Flow
Switch pins J10-45 (entering). Flow proving switch is optional,
hook up as shown in Fig. 4 and Note 6. The unit will not
operate without a flow proving switch or jumper installed.
Load Flow Switch (LFS)
Unit is factory shipped with jumpers on the Load Flow Switch
pins J9-56 (leaving). Flow proving switch is optional, hook
up as shown in Fig. 4 and Note 5. The unit will not operate
without a flow proving switch or jumper installed.
Load and Source Pump
The load or source pump connection allows for 4.2 A at
208/60/1 on each (208/60/1 models only). This pump
supply should be adequate for most applications. Please
consult the electrical schematic and table for more detail.
Figure 4 - Wiring Schematic
SFS
LFS
ES
42
43
44
45
46
47
48
24VAC Com
DI12
DI11
DI10
DI9
DI8
DI7
49
50
51
52
53
54
55
56 DI 3/4/5/6/ Com
DI6
DI5
DI4
DI3
DI2
DI1
9VDC
J10
J9
2
3
1
PB2
Black (54)
Red (55)
Gray (56)
Pink (58)
Brown (57)
Gray (59)
Blue (45)
Blue (46)
Orange (47)
Gray (48) Connect to R on PB1-1
White (67)
White (66)
Blue (76A)
Blue (76B)
NOTE 2
NOTE 3
NOTE 5
NOTE 6
NOTE 9
C\Wb>]eS`Ac^^Zg
& ! $ 
5
: :
: :
B B
C\Wb>]eS`Ac^^Zg
& ! $ 
5
: :
: :
B B
11/ 110
AW\UZS>VOaS