Carrier 50TC Series - Units with Factory-Installed Non-Fused Disconnect

15
NOTE: TEST LEADS -- Unit may be equipped with
short leads (pigtails) on the field line connection points on
conta ctor C or optional disconnect switch. These leads are
for fa ctory run--t est purposes only; remove and discard
before connecting field power wires to unit connection
points. Make field power connections directly to line
connec tion pre ssure lugs only.
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or perfor man ce satis f action .
Do not connect aluminum wire between disconnect
switch and furnace. Use only copper wire.
(See Fig. 16.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 16 -- Disconnect Switch and Unit
Units with Factory-- Installed Non--Fused Disconnect —
The fa ctory--installed option non--fused disconne ct (NFD)
switch is located in a weatherproof enclosure located
under the main control box. The manual switch handle and
shaft are shipped in the disconnect enclosure. Assemble the
shaft and handle to the switch at this point. Discard the
factory test leads (see Fig. 19).
Connect fiel d power supply conductors to LINE side
terminals when the switch enclosure cover is removed to
attach the handle.
C12284
Fig. 17 -- Location of Non--Fused Disconnect Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front pane (see Fig. 2 and 3).
2. Remove (3) hex screws on the NFD enclosure -- (2) on
the face of the cover and (1) on the left side cover.
3. Remove the front cover of the NFD encl osure.
4. Make sure the NFD shipped from the factory is at
OFF position (the arrow on the black handle knob is
at OFF).
5. Insert the shaft with the cross pin on the top of the shaft
in the horizontal position.
6. Measure from the ti p of the shaft to the top surface of
the black pointer; the measurement should be 3. 75 to
3.88 in. (95 to 99 mm).
7. Tighten the locking screw to secure the shaft to the
NFD.
8. Turn the handle to the OFF position with red arrow
pointing at OFF.
9. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) sc rews
and lock washers supplied.
11. Engaging the shaft int o the handle socket , re--install
(3) hex screws on the NFD enclosure.
12. Re--install the unit front panel.
C12279
Fig. 18 -- Handle and Shaft Assembly for NFD
50TC