Supply Fan (Blower) Section; Supply Fan (Direct-Drive) - Carrier 50GCQ Series Service And Maintenance Instructions

17-1/4"
Divider
Cleanable
Aluminum
Filter
Barometric
Relief
Fig. 3 — Filter Installation
To remove the filter, open the filter clips. Reinstall the filter by
placing the frame in its track, then closing the filter clips.
MANUAL OUTSIDE AIR HOOD SCREEN
This inlet screen is secured by a retainer angle across the top edge
of the hood. (See Fig. 4.)
Screws
Fig. 4 — Screens Installed on Outdoor-Air Hood
To remove the screen, loosen the screws in the top retainer and slip
the retainer up until the filter can be removed. Reinstall by placing
the frame in its track, rotating the retainer back down, and tighten-
ing all screws.
Outside
Air
Hood
Filter
Filter
Clip
4

SUPPLY FAN (BLOWER) SECTION

WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
Before performing service or maintenance operations on unit,
LOCKOUT/TAGOUT the main power switch to unit.
Electrical shock and rotating equipment could cause severe
injury.
All low-voltage wiring should be routed through the provided
raceway built into the corner post of the unit or secured to the unit
control box with the electrical conduit in order to provide UL-
required clearance between high and low-voltage wiring.

Supply Fan (Direct-Drive)

All 50GCQ units have the EcoBlue™ direct drive vane axial fan
system. The fan is driven by an ECM motor with speed that is user
set through the Unit Control Board (UCB). Speeds are fully con-
figurable from 40% to 100% of motor's maximum speed. See
Fig. 5 and 6.
Motor
Plug
Fan
Rotor
ECM
Motor
Fig. 5 — Direct-Drive Supply Fan Assembly
BLUE
YELLOW
3 2 1
BLACK
6 5 4
GRN/YEL
9 8 7
WHITE
ORANGE
GRAY
Fig. 6 — ECM Motor Plug Connectors
Power L3 (3 phase only)
Power L2
Power L1
Earth Ground
CTL Signal Common
10 vdc Source
0–10 vdc Signal