Carrier WeatherMaster 50HC14 Installation Instructions Manual page 15

Units Without Single Point Box, Disconnect or HACR Option
TB1
11 12
Disconnect
per
NEC
L1 L2
208/230-3-60
460-3-60
575-3-60
Units With Disconnect or HACR Option
L1 2
Optional
Disconnect
L2 4
Switch
or HACR
L3
6
Ground
(GR)
Disconnect factory test leads; discard.
Units With Electric Heat Option with Single Point Box
and Without Disconnect or HACR Option
Single Point Box
Terminal Block
L1
L2
L3
Ground (GR)
Equip GR
— OR —
Single Point Box
Fuse/Terminal Block
L1 Fuse
Fuse
L2
L3 Fuse
Ground (GR)
Equip GR
Fig. 23 — Power Wiring Connections
Equip
13
GR Lug
L3 Ground
(GR)
1
3
Factory
Wiring
5
Equip GR Lug
Factory
Wiring
Lug
Factory
Wiring
Lug
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage intermittent operation or
performance satisfaction.
Do not connect aluminum wire between disconnect switch
and air conditioning unit. Use only copper wire. (See
Fig. 24.)
ELECTRIC
DISCONNECT
SWITCH
Fig. 24 — Disconnect Switch and Unit
ALL UNITS — All field wiring must comply with NEC and
all local requirements.
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 23 and the unit label diagram
for power wiring connections to the unit power terminal blocks
and equipment ground. Refer to Table 2 for maximum wire
size at connection lugs.
Provide a ground-fault and short-circuit over-current protec-
tion device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maxi-
mum Over-current Protection) device size.
NOTE: Units ordered with factory installed HACR do not
need an additional ground-fault and short-circuit over-current
protection device unless local codes require.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the following formula to de-
termine the percent of voltage imbalance.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
Example: Supply voltage is 230-3-60.
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 227 224 = 3 v
–
(BC) 231 227 = 4 v
–
(AC) 227 226 = 1 v
–
Maximum deviation is 4 v.
15
WARNING
COPPER
WIRE ONLY
ALUMINUM
WIRE
average voltage
224 + 231 + 226
3
681
=
3
=
227