Manual 2100-537
I
Page 15 of 54
BLOWER CONVERSION FROM UPFLOW
TO COUNTERFLOW OR HORIZONTAL
RIGHT DISCHARGE
Following the directions on Figure 3 for counterow and
horizontal right discharge, the indoor blower must be
removed and turned over in its mounting conguration.
• Step 1 Remove both front service panels from the
GTB1-A.
• Step 2 Remove two screws securing blower at top
of GTB1-A (See Figure 3), and slide the
blower forward and out of the chassis.
• Step 3 Remove two screws from front ll plate on
bottom of GTB1-A, and slide both pieces of
metal forward and out of chassis.
• Step 4 Dip switch #4 on blower tap select control
must be turned “on”. (Refer to Wiring
Diagram 4117-100.)
• Step 5 While turning on tap #4 above, adjust the
other taps accordingly for the tonnage of unit
being applied. (Refer to Wiring Diagram
4117-100.)
• Step 6 Turn blower over and slide into rails of
bottom rear of the GTB1-A front ll plate
that was removed in Step 3 above.
• Step 7 Remove bottom rear ll plate from bottom
front ll plate (discard rear), and resecure
front ll plate into unit base and front of
blower.
• Step 8 Replace GTB1-A front service doors after
making line and control voltage wiring
connections.
BLOWER LINE POWER CONNECTION
Power connections for the GTB1-A can be made two
different ways.
The rst is in “stacked” congurations, the blower can
be plugged into an electrical connection from the bottom
of the compressor (GTC**S2 Model Unit). This will
work for either upow or counterow applications. All
electrical sizing has been sized to accommodate this.
The second is with “remote” blower (meaning separate
from the compressor section). Supplied in the GTB1-A
is an adaptor wire harness. On the right-hand side of the
GTB1-A chassis is a ½" electrical knockout. This harness
can be installed through this knockout with the supplied
strain relief into a standard electrical junction box (eld
supplied). Electrical load sizing is included on the serial
plate of the GTB1-A for the required separate branch
circuit (See Figure 4).
