Page 14
Electrical Connections
POWER SUPPLY
Do not apply power or close disconnect switch until
installation is complete. Refer to start-up directions.
Refer closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity
and maximum fuse size.
1- 230/460/575 volt units are factory wired.
For 208V
supply
, disconnect the orange wire (230V) at
control power transformer(s). Reconnect the red
wire (208V). Tape the exposed end of the 230V
orange wire.
2- Route power through the bottom power entry area
and connect to line side of unit disconnect or circuit
breaker. If unit does not contain optional controls
package, connect power wiring to TB13 terminal
block. See unit wiring diagram.
3-
Units With Optional 120v GFCI Outlet -
Route and connect separate 120v wiring to GFCI
outlets which do not have factory-installed wiring.
CONTROL WIRING
A-Thermostat Location
Room thermostat mounts vertically on a standard 2” X 4”
handy box or on any non-conductive flat surface.
Locate thermostat approximately 5 feet (1524mm)
above the floor in an area with good air circulation at
average temperature. Avoid locating the room
thermostat where it might be affected by:
-drafts or dead spots behind doors and in corners
-hot or cold air from ducts
-radiant heat from sun or appliances
-concealed pipes and chimneys
B-Wire Routing
Route thermostat cable or wires from subbase through
knockout or bottom power entry area provided in unit. Use
18 AWG wire for all applications using remotely installed
electro-mechanical and electronic thermostats.
IMPORTANT - Unless field thermostat wires are rated
for maximum unit voltage, they must be routed away
from line voltage wiring.
C-Wiring Connections
This unit is equipped with a series of integrated modular
control (IMC) boards which control unit function. Refer to
the IMC manual provided with each unit.
The IMC will operate the unit from a thermostat, zone
sensor, zoning system or the FS1-1 (A138) controller
based on the System Mode selected in ECTO 6.01. The
default System Mode (option 0) is the thermostat mode.
1-
Default
Thermostat Mode ECTO 6.01 Option 0 -
The IMC will operate two stages of heating and
cooling based on thermostat demands. Install
thermostat assembly in accordance with instructions
provided with thermostat. See figure 18 for field
wiring and wiring diagrams on unit.
IMPORTANT-Terminal connections at the wall plate or
subbase must be made securely. Loose control wire
connections may result in intermittent operation.
Note - Install sensor and make communication wiring
connections as shown in literature provided with sensor
.
1
2
18
FIGURE 18
24 VOLT FIELD WIRING IN THERMOSTAT MODE
(IMC in default T'Stat System Mode 6.01 Option 0)
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
TB1
Not all terminals
are provided on all
thermostats.
Note - On electro-me
chanical thermostats set
anticipator at 0.1 amps.
Jumper 8 & 9 when
thermostat has no night
setback terminals; unit will
operate in occupied mode.
19
20
21
22
23
24
25
A2 (2 HT / 2CL)
THERMOSTAT
Remove the jumper when
a Network Control Panel
(NCP) is installed.
95
96
Install optional A42 phase
monitor and/or S42 over
load relay switch.
2-
Zone Sensor Mode ECTO 6.01 Option 1, 2, or 3-
The IMC will operate up to four stages of heating and
cooling based on the IMC internal setpoints and the
temperature from the A2 zone sensor. An optional
Network Control Panel (NCP) can also be used to
provide setpoints. A thermostat or return air sensor
