EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—136
Table 9. Field Wiring Reference Table (Honeywell listed as AK#### or equivalent).
W7750 Controllers
Fi
. 27 throu
h 35 illustrate W7750A,B,C Controller wirin
for
various confi
urations. Connections to the wall module
terminals
2 throu
h 6
and the communications terminals
14
and 15
are made at terminal blocks. Connection for access to
the L
ON
W
ORKS
Bus is provided b
plu
in
the connector into
the communications
ack.
Fig. 25. Attaching two or more wires at terminal blocks.
The W7750B provides a
umper to select Hi
h-Side or Low-
Side switchin
of the di
ital outputs. Fi
. 26 shows the
W7750B Hi
h-Side/Low-Side selectable switchin
.
See
wirin
dia
rams, Fi
s. 30 throu
h 34.
Fig. 26. W7750B High-Side/Low-Side selectable switching
and jumper location.
NOTE: If an Excel 10 W7750A,B,C Controller or Zone
Mana
er is not connected to a
ood earth
round,
the controller internal transient protection circuitr
is
compromised and the function of protectin
the
controller from noise and power line spikes cannot
be fulfilled. This can result in a dama
ed circuit
board and re
uire replacin
the controller.
See Table 10 for a description of the W7750A terminals.
Wire
Function
Recommended
Minimum Wire
Size AWG (mm
2
) Construction
Specification
or
Requirement Vendor Wire Type
Maximum Length ft.
(m)
L
ON
W
ORKS
Bus
(Plenum)
22 AWG
0.34 mm
2
Twisted pair solid
conductor, nonshielded
or Echelon approved
cable.
Level IV
140°F
60°C
ratin
Hone
well
AK3791
one twisted pair
AK3792
two twisted pairs
Refer to L
ON
W
ORKS
Bus
Wirin
Guidelines for
maximum len
th
L
ON
W
ORKS
Bus (Non-
Plenum)
22 AWG
0.34 mm
2
Twisted pair solid
conductor, nonshielded
or Echelon approved
cable.
Level IV
140°F
60°C
ratin
Hone
well
AK3781
one twisted pair
AK3782
two twisted pairs
Refer to L
ON
W
ORKS
Bus
Wirin
Guidelines for
maximum len
th
Input
Wiring
Sensors
Contacts
18 to 22 AWG
1.0 to 0.34 mm
2
Multiconductor
usuall
five-wire cable bundle
.
For runs >200 ft.
61m
in nois
EMI areas, use
shielded cable.
140°F
60°C
ratin
Standard thermostat wire 1000 ft.
305m
for 18
AWG 200 ft.
61m
for 22
AWG
Output
Wiring
Actuators
Relays
14 AWG
2.0 mm
2
18 AWG
1.0 mm
2
acceptable for
short runs
An
pair nonshielded
use heavier wire for
lon
er runs
.
NEC Class 2
140°F
60°C
ratin
Hone
well
AK3702
18 AWG
AK3712
16 AWG
AK3754
14 AWG
Limited b
line-loss
effects on power
consumption.
See Line
Loss subsection.
Power
Wiring
14 AWG
2.0 mm
2
An
pair nonshielded
use heavier wire for
lon
er runs
.
NEC Class 2
140°F
60°C
ratin
Hone
well
AK3754
14 AWG
twisted
pair AK3909
14 AWG
sin
le conductor
Limited b
line-loss
effects on power
consumption.
See Line
Loss subsection.
1/2
(13)
STRIP 1/2 IN. (13 MM)
FROM WIRES TO
BE ATTACHED AT
ONE TERMINAL.
1.
2.
TWIST WIRES
TOGETHER WITH
PLIERS (A MINIMUM
OF THREE TURNS).
3. CUT TWISTED END OF WIRES TO 3/16 IN. (5 MM)
BEFORE INSERTING INTO TERMINAL AND
TIGHTENING SCREW. THEN PULL ON EACH
WIRE IN ALL TERMINALS TO CHECK FOR
GOOD MECHANICAL CONNECTION.
M17207
U3
Q38
J2
JUMPER
TERMINAL 24
J2 IS LOCATED NEAR TERMINAL 24 (COVER REMOVED).
W7750B IS FACTORY-DELIVERED WITH JUMPER ON HIGH-SIDE
(PINS CLOSEST TO TERMINAL BLOCK). LOW-SIDE PINS ARE TWO
PINS CLOSEST TO Q38.
1
1
2
2
M16418A
