Carrier 50YQ - Manual (Page 4)

g. Secure all ducts to building structure. Weather­
proof duct openings in wall or roof according to
good construction practices.
"Separate disconnect required for electric heater
> Fig. 4 — Typical Installation — 50YQ
Step 4 — Provide for Cooling Cycle Conden­
sate Disposal
— Condensate may be drained
directly onto gravel apron or connected by drain
line(s) to a dry well. Follow local codes.
CONNECT DRAIN LINE to rubber condensate
drain fitting on side of unit (see Fig. 5). Use clamp
provided. Install factory-supplied condensate trap
(taped to indoor fan compartment for shipment) at
end of drain line. If a drain line is not used, connect
condensate trap to unit drain fitting as shown in
Fig. 5.
CONDENSATE
TRAP (SHIPPING
LOCATION, INSTALL
ON CONDENSATE
DRAIN LINE)
CONDENSATE
DRAIN LINE
¡i DKO LINE
POWER
Fig. 5 — Condensate Drain and Trap Details
Step 5 — Make Electrical Connections — In­
stall field wiring in compliance with local and
national fire, safety and electrical codes. Be sure
voltage to unit is within ± 10% of voltage indicated
on nameplate. On 3-phase units, check that phases
are balanced within 2%. Contact local power
company for correction of improper line voltage.
Oisrratton «kf tïiïÿi
wth exijessm phase ¡as
coiaM
affect waCFaïïty,
See Table 2 for recommended wire and fuse
sizes.
INSTALL A BRANCH CIRCUIT DISCONNECT
PER NEC of adequate size to handle unit starting
current. Provide a separate disconnect for unit
and for each accessory electric heater circuit as
required. (See electrie heater Installation, Start-Up
and Service Instructions.) Locate disconnect(s)
within sight of and readily accessible from the unit,
per Section 440-14 of National Electrical Code
(NEC).
ROUTE LINE POWER LEADS INTO UNIT ^
Extend leads from disconnect per NEC thru hole
provided (Fig. 1) into line wiring splice box (Fig. 6).
Use copper or copper-clad aluminum wire. (Do not
make connections with aluminum wire.)
UNIT
CONTROL BOX CONTROL WIRING
TERMINAL BOX
CONTROL WIRING
CONDUIT,
Fig. 6 — Unit Control Box
CONNECT GROUND LEAD TO GROUND
LUG IN SPLICE BOX FOR SAFETY — Connect
power wiring. See Fig. 7. Connect line power leads
to yellow and black pigtails on single-phase units;
yellow, blue and black pigtails on 3-phase units.
SET INDOOR FAN MOTOR SPEED — Refer to
page 3 for minimum allowable air quantity for safe
electric heater operation. Three-speed indoor fan
motor is factory wired for high-speed operation.
Fan motor is equipped with spade-type speed selec­
tor terminals marked 1, 2 and 3. For electric heater
operation, set motor at: “Low” — sizes 024 thru 042;
“High” — size 048; “Med” — size 060.
MOTOR TERMINAL 1 2 3
FAN SPEED High Medium Low
ROUTE CONTROL POWER WIRES (24-v) thru
7/8-in. conduit provided in unit. Fig. 1 and 5. Ex­
tend leads to unit control wiring terminal board in
unit control box. Connect leads to terminal board
as directed in Fig. 8.
The 50YQ unit transformer supplies 24-v power
for complete system including accessory electric
heater.
7 8 1