Lennox CHA16, Service Manual

Page: 26 / 86

Page 26
TYPICAL BLOWER COMPARTMENT AND POWER ENTRY
(CHA16-1853 SHOWN FOR CLARITY)
LINE VOLTAGE
MAKE-UP STRIP TB2
LOW VOLTAGE
TERMINAL STRIP TB1
BLOWER
BLOWER MOTOR
ADJUSTABLE PULLEY
(CFM ADJUSTMENT)
MOTOR MOUNTING PLATE
BELT TENSION ADJUSTMENT
BLOWER PULLEY
EVAPORATORS
DRIVE BELT
MULLION
POWER ENTRY
CONTROL
ENTRY
OPTIONAL
ELECTRIC
HEAT
FIGURE 24
CHA16 LOW VOLTAGE/LINE VOLTAGE
TERMINAL STRIP ALL UNITS
FIGURE 25
LOW VOLTAGE
TERMINAL STRIP TB1
LINE VOLTAGE
MAKE-UP STRIP TB2
THERMOSTAT
CONNECTIONS
2-Low Voltage Terminal Strip TB1
All units are equipped with a low voltage terminal strip TB1 lo
cated in the heating/power entry makeup compartment. See
figures 24 and 25. Most low voltage (thermostat) electrical
connections can be made to this terminal strip. A separate ac
cess panel is provided adjacent to the blower access panel.
Knock-outs provided in the base pan of the unit cabinet allow
for passage of wires into conduit and roof mounting frame.
Special instructions are provided where needed for low volt
age connections that cannot be made to the terminal strip. A
detail drawing of TB1 is also shown in figure 26.
FIGURE 26
LOW VOLTAGE
TERMINAL STRIP TB1
TO INSERT OR RELEASE
WIRE, DEPRESS CENTER
WITH PEN OR SMALL
SLOT SCREWDRIVER .
CHA16 LOW VOLTAGE TERMINAL STRIP
ALL UNITS
TB1 uses spring crimp type retainers for securing wires. A
small slot screwdriver must be used to depress the spring in
order to insert or remove a wire (see figure 26). Strip wire no
more than 1/4".
3-Line Voltage MakeUp Strip TB2
All units are equipped with a line voltage makeup strip TB2
located in the heating/power entry makeup compartment.
See figures 24 and 25. TB2 is used to make connection of all
line voltage wiring. Knock-outs provided in the base pan of
the unit cabinet allow for passage of wires into conduit and
roof mounting frame. A separate access panel is provided
adjacent to the blower access panel.