Step 10 - Make Electrical Connections; Field Power Supply - Carrier WeatherMaster Series Installation Instructions Manual

Step 10 — Make Electrical Connections
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Do not use gas piping as an electrical ground. Unit cabinet
must have an uninterrupted, unbroken electrical ground to
minimize the possibility of personal injury if an electrical
fault should occur. This ground may consist of electrical wire
connected to unit ground lug in control compartment, or
conduit approved for electrical ground when installed in
accordance with NEC (National Electrical Code); ANSI/
NFPA 70, latest edition (in Canada, Canadian Electrical
Code CSA [Canadian Standards Association] C22.1), and
local electrical codes.
NOTE: Field-supplied wiring shall conform with the limitations
of minimum 63°F (33°C) rise.

FIELD POWER SUPPLY

If equipped with optional Powered Convenience Outlet:
The power source leads to the convenience outlet's trans-
former primary are not factory connected. Installer must con-
nect these leads according to required operation of the conve-
nience outlet. If an always-energized convenience outlet op-
eration is desired, connect the source leads to the line side of
the unit-mounted disconnect. (Check with local codes to en-
sure this method is acceptable in your area.) If a de-energize
via unit disconnect switch operation of the convenience outlet
is desired, connect the source leads to the load side of the unit
disconnect. On a unit without a unit-mounted disconnect,
connect the source leads to compressor contactor C and in-
door fan contactor (IFC) pressure lugs with unit field power
leads.
Field power wires will be connected at the line-side pres-
sure lugs on the power terminal block or at factory-installed
option non-fused disconnect or HACR.
Field power wires are connected to the unit at line-side
pressure lugs on compressor contactor C and indoor fan con-
tactor IFC (see wiring diagram label for control box compo-
nent arrangement), or at factory-installed option non-fused
disconnect switch or HACR or electric heat single point box.
Max wire size is #4ga AWG (copper only) per pole on con-
tactors, #4ga AWG (copper only) or 1/0 AWG (copper only)
per pole on optional disconnect (max wire size depends on
the disconnect size supplied with unit), 1/0 AWG (copper on-
ly) on optional HACR and 4/0 AWG (copper only) per pole
on terminal or fuse block on units with single point box. See
Fig. 18 and unit label diagram for field power wiring
connections.
NOTE: TEST LEADS — Unit may be equipped with short
leads (pigtails) on the field line connection points on contactor C
or optional disconnect switch or HACR. These leads are for fac-
tory run-test purposes only; remove and discard before connect-
ing field power wires to unit connection points. Make field pow-
er connections directly to line connection pressure lugs only.
Units Without Single Point Box, Disconnect or HACR Option
TB
11 12
Disconnect
per
NEC
208/230-1-60
Units With Disconnect or HACR Option
L1 2
4
L2
3 Phase Only
L3 6
Ground
(GR)
Disconnect factory test leads; discard.
Units With Electric Heat Option with Single Point Box
and Without Disconnect or HACR Option
L1
L2
L3
Ground (GR)
L1
L2
L3
Ground (GR)
Fig. 18 — Power Wiring Connections
15
Equip
GR Lug TB
11 12 13
Disconnect
per
NEC
Ground L1 L2 L3
(GR)
208/230-3-60
460-3-60
1
Optional
Disconnect
3
Switch 3 Phase Only
5
Equip GR Lug
Single Point Box
Terminal Block
Equip GR
Lug
— OR —
Single Point Box
Fuse/Terminal Block
Fuse
Fuse
Fuse
Equip GR
Lug
Factory
Wiring
Factory
Wiring
Factory
Wiring