Electrical - Lennox G21Q Series Installation Instructions Manual

ELECTRICAL

1 - - Select circuit protection and wire size according to
the unit rating plate.
2 - - Access openings are provided on both sides of the
furnace cabinet to facilitate wiring.
3 - - Install the room thermostat according to instruc-
tions provided with the thermostat. See figure 20
for thermostat designations.
4 - - Install a separate disconnect switch (protected by
either fuse or circuit breaker) near the unit so that
power can be turned off for servicing.
5 - - Complete wiring connections to the equipment
using the provided wiring diagrams.
6 - - Electrically ground the unit according to local
codes or, in the absence of local codes, according
7<3,&$/ *4 :,5,1* ',$*5$0
),*85( 
3DJH 
to the current National Electric Code ANSI/NFPA
for the U.S.A. and current Canadian Electrical
Code Part 1 for Canada.
7 - - Install an auxiliary receptacle near unit.
G21 and CONDENSING UNIT
THERMOSTAT DESIGNATIONS
(Refer to specific thermostat and outdoor unit.)
G21
Thermostat
Furnace
POWER
4 4
HEAT
9
;
INDOOR BLOWER
/ /
COMMON
+ +
FIGURE 20
Condensing
Unit
4 4
9 9
HS UNIT
COMPRESSOR COMPRESSOR
;
/ /
HS UNIT
COMMON
COMMON
+ +