Field Control Wiring - Carrier 50TFQ008 Installation, Start-Up And Service Instructions Manual

FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation in-
structions included with the accessory. Locate thermostat
assembly on a solid wall in the conditioned space to sense aver-
age temperature in accordance with thermostat installation
instructions.
NOTE: If using Carrier electronic thermostat, set thermostat
configuration for "non-heat pump operation." The use of the O
terminal is not required to energize the reversing valve in this
family of products.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals to low-voltage connections on
unit (shown in Fig. 9) as described in Steps 1 through 4 below.
NOTE: For wire runs up to 15 m (50 ft), use no. 18 AWG
(American Wire Gage) insulated wire (35 C minimum). For
15 m to 23 m (51 to 75 ft), use no. 16 AWG insulated wire
(35 C minimum). For over 23 m (75 ft), use no. 14 AWG insu-
lated wire (35 C minimum). All wire larger than no. 18 AWG
cannot be directly connected to the thermostat and will require
a junction box and splice at the thermostat. See Table 3 for
American/European wire conversions.
1. If unit is mounted on roof curb and accessory thru-the-
curb service plate connection is used, route wire through
connection plate.
2. Pass control wires through the hole provided on unit (see
connection D in Connection Sizes table in Fig. 5).
3. Feed wire through the raceway built into the corner post
to the 24-v barrier located on the left side of the control
box. See Fig. 9. The raceway provides the UL (Under-
writers' laboratories, U.S.A.) required clearance between
the high- and low-voltage wiring.
4. Connect thermostat wires to screw terminals of low-
voltage connector (see Fig. 10).
NOTE: If thru-the-bottom power connections are used refer to
the accessory installation instructions for information on power
wiring. Refer to Fig. 5 for drilling holes in basepan.
DEFROST BOARD — The defrost board timer cycle is set to
30 minutes. To change the cycle time, remove the wire from
defrost board connected to the 30 minute quick-connect. See
Fig. 11. Connect the wire to the 50 or 90 minute quick-
connects on the defrost board, depending on the desired defrost
time.
Table 3 — American/European Wire Conversions
AMERICAN
Industry American Conversion
Standard Size (mm
18 AWG
16 AWG
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG 13.29
4 AWG 21.14
3 AWG 26.65
2 AWG 33.61
1 AWG 42.39
1/0 AWG 53.49
2/0 AWG 67.42
3/0 AWG 85.00
4/0 AWG 107.19
250 kcmil 126.64
300 kcmil 151.97
350 kcmil 177.90
400 kcmil 202.63
500 kcmil 253.29
303.95
600 kcmil
LEGEND
AWG — American Wire Gage
kcmil — Thousand Circular Mils
EUROPEAN
Industry Standard
2 2
) Size (mm )
0.82 1.0
1.30 1.5
2.08 2.5
3.30 4.0
5.25 6.0
6.36 10.0
16.0
25.0
—
35.0
50.0
—
70.0
95.0
120.0
150.0
—
185.0
240.0
300.0
—
HEAT ANTICIPATOR SETTINGS — For units with elec-
tric heat, set heat anticipator settings as shown in Table 4.
Table 4 — Heat Anticipator Settings
UNIT
Heater
kW
9.6, 11.5, 19.3, 28.9
50TFQ
22.9, 34.7
DISCONNECT
TERMINAL
SWITCH
STRIP
(OPTIONAL)
RACEWAY
Fig. 9 — Typical Field Control Wiring Raceway
LEGEND
AHA — Adjustable Heat Anticipator
Field Wiring
Factory Wiring
Fig. 10 — Low-Voltage Connections With or
Without Economizer or Two-Position Damper
10
UNIT VOLTAGE
400
Configuration
1-Stage 2-Stage
Stage 1 Stage 1 Stage 2
0.3 NA NA
0.6 0.3 0.3
EURO-STYLE
CONTROL BOX
SINGLE-POINT BOX