Lennox G21Q Series Unit Information

Page 36
TABLE 13
VSP2−1 OPERATION
HEATING MODE COOLING MODE
UNITS WITH
SINGLE−STAGE HEATING
UNITS WITH
TWO−STAGE HEATING
UNITS WITH
SINGLE−SPEED
COMPRESSOR
UNITS WITH
TWO−SPEED
COMPRESSOR
NON−ZONED
APPLICATIONS
With the HTG. BLOWER jumper in
position #1, the ON/OFF LED−DS3
and HEAT LED−DS2 are lit to indicate
the blower is operating in heating
speed.
These LEDs are lit after 75 seconds
(30 seconds pre−purge and 45 sec
onds fan ON" time) from the time a
call for heat is made. For low speed
operation with single stage heating,
place HTG. BLOWER jumper in posi
tion #2.
This will run the blower on low speed
when W1" is energized. (ON/OFF
LED−DS3 will be the only light on.)
NON−ZONED
APPLICATIONS
With the HTG. BLOWER jumper in
position #2, the ON/OFF LED−DS3 is
lit to indicate the blower is operating in
low speed.
This LED is lit after 75 seconds (30
seconds pre−purge and 45 seconds
time fan ON" delay) from the time the
W1" terminal is energized from W1"
from the thermostat. The ON/OFF
LED−DS3 and HEAT LED−DS2 are lit
to indicate that the blower is in heating
speed.
The second stage heat signal is ap
plied to W2" from W2" terminal of the
thermostat.
NON−ZONED
APPLICATIONS
The terminals DS" and G" must be
jumpered together. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit to
indicate the blower is operating.
NON−ZONED
APPLICATIONS
The ON/OFF LED−DS3 is lit to indi
cate the blower is operating in first
stage cooling. This LED is energized
on when a 24VAC thermostat demand
is supplied to the control (terminal G"
on the control box terminal strip).
In second stage, the ON/OFF LED−
DS3 and HI/LOW LED−DS1 are lit to
indicate the blower is operating on
high speed (24VAC is supplied to the
unit terminal strip Y2" from Y2" on the
thermostat).
NOTEY2" must be jumpered to
DS" in two−speed, non−zoned ap
plications.
ZONED APPLICATIONS
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center of
the zoning system to the terminal
strip’s DS" terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
NOTE−In Harmony II zoning ap
plications, HTG. BLOWER jumper
must be in position #2.
ZONED APPLICATIONS
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center of
the zoning system to the terminal
strip’s DS" terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
NOTE−In Harmony II zoning ap
plications, HTG. BLOWER jumper
must be in position #2.
ZONED APPLICATIONS
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center
of the zoning system to the terminal
strip’s DS" terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
ZONED APPLICATIONS
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center of
the zoning system to the terminal
strip’s DS" terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
III − PROPER INSTALLATION
Refer to the G21/GSR21 series units InstallationOperation
Maintenance Instruction Manual for complete installation in
structions. Also see figures 42, 43 and 44.
On units equipped with a GC1 ignition control, on initial power
up of the ignition control, it is possible to get a spark from the
spark plug without any heating demand from the thermostat.
This is an inherent property of ignition controls used in all fur
naces. A spark could ignite any PVC glue fumes accumulated
in the combustion chamber and could result in drain tap or in
take line damage.
A − Proper Grounding
G21/GSR21 units are equipped with a grounding lug located in
the control box. Connection to earth ground is made here.
B − Isolation Mount Pads (Isomode)
If leveling bolts are not used, vibration isolating pads should be
used especially when installed on wood flooring. Isomode
pads or equivalent should be used.
C − Flexible Boot(Supply/Return Air Plenum)
A flexible canvas boot or equivalent should be used in the sup
ply air plenum, above the cooling coil or future coil location. For
the return air plenum a flexible canvas boot or equivalent
should be used and located as close to the furnace as pos
sible. It is preferred to locate the boot between the furnace and
the external electronic air cleaner, if used.
D − Supply Air Plenum or Return Air Plenum
Insulation Past First Elbow
A 1.5 to 3 lb. density, matte face, 1 inch thick insulation should
be used and all exposed edges should be protected from air
flow.
E − Transporting the Unit
When moving or lifting the unit all access panels must be in
place to prevent damage (sagging) to the unit. The blower may
be removed to reduce the unit weight while moving.
F − Electrical Conduit Isolated from Duct
System and Joists
The electrical conduit can transmit vibration from the cabinet to
the duct system or joists if clamped to either one. It may be
clamped tightly to the unit cabinet but should not touch duct
work or joists.

Lennox G21Q Series Specifications

General

Brand	Lennox
Model	G21Q Series
Category	Industrial Equipment
Language	English