Table of Contents
Advertisement
Ttypical
Thermostat
Corrections
C
G
W2
(Note 3)
W1
O/B/Y2
(Note 1)
(Note 2)
Y1
R
Note 1: Typical multi-function marking. Follow manufacturer's configuration
instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired
Note 3: W2 connection not required on units with single-stage heating.
Field Wiring
Fig. 25 — Typical Low-Voltage Control
Connections
UNIT WITHOUT THRU-BASE CONNECTION KIT —
Pass the thermostat control wires through the hole provided in
the corner post; then feed the wires through the raceway built
into the corner post to the control box. Pull the wires over to
the terminal strip on the upper-left corner of the Controls Con-
nection Board. See Fig. 26.
RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 26 — Field Control Wiring Raceway
NOTE: If thru-the-bottom connections accessory is used, refer
to the accessory installation instructions for information on
routing power and control wiring.
Bare Heater Model Number
Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet
Central
Terminal
Board
X
C
T
H
G
E
R
W2
M
O
W1
S
T
Y2
A
T
Y1
R
Table 2 — Heater Model Number
C
R
H
E
C
R
H
E
HEAT ANTICIPATOR SETTINGS — Set heat anticipator
settings at 0.14 amp for the first stage and 0.14 amp for second-
stage heating, when available.
Electric Heaters —
with field-installed accessory electric heaters. The heaters are
modular in design, with heater frames holding open coil resis-
tance wires strung through ceramic insulators, line-break limit
switches and a control contactor. One or two heater modules
may be used in a unit.
Heater modules are installed in the compartment below the
indoor (supply) fan outlet. Access is through the indoor access
panel. Heater modules slide into the compartment on tracks
along the bottom of the heater opening. See Fig. 27-29.
Not all available heater modules may be used in every unit.
Use only those heater modules that are UL listed for use in a
specific size unit. Refer to the label on the unit cabinet for the
list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with a
corresponding heater Sales Package part number. See Table 2
for correlation between heater Model Number and Sales Pack-
age part number.
NOTE: The value in position 9 of the part number differs be-
tween the sales package part number (value is 1) and a bare
heater model number (value is 0).
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
Fig. 27 — Typical Access Panel Location (3-5 Ton)
DISCONNECT
EMT OR RIGID CONDUIT
MOUNTING
(FIELD-SUPPLIED)
LOCATION
SINGLE POINT
MAIN
BRACKET AND
BOX
CONTROL
CONDUIT
MOUNTING
BOX
DRIP BOOT
SCREW
Fig. 28 — Typical Component Location
A
T
E
R
A
T
E
R
17
The 50TC units may be equipped
OUTDOOR
ACCESS PANEL
SINGLE
CENTER
MANUAL RESET
POINT BOX
POST
LIMIT SWITCH
HEATER
HEATER
MODULE
MODULE
(LOCATION 1)
(LOCATION 2)
CONTROL WIRE TERMINAL BLOCK
0
0
1
A
0
1
0
1
A
0
INDOOR
ACCESS
PANEL
HEATER
COVERS
HEATER
MOUNTING
BRACKET
0
0
Advertisement
Table of Contents
