Cooling Mode Ramping Options; Dip Switch Settings; Cooling Mode Blower Speeds; Cooling Mode Blower Speed Ramping - Lennox G61MPV Service Manual

Dip Switch Settings

Switches 1 and 2 −− Blower Off Delay −− The blower−on
delay of 45 seconds is not adjustable. The blower−off delay
(time that the blower operates after the heating demand
has been satisfied) can be adjusted by moving switches 1
and 2 on the integrated control board. The unit is shipped
from the factory with a blower−off delay of 90 seconds. The
blower off delay affects comfort and is adjustable to satisfy
individual applications. Adjust the blower off delay to
achieve a high fire supply air temperature between 90° and
110°F at the exact moment that the blower is de−energized.
Longer off delay settings provide lower supply air tempera-
tures; shorter settings provide higher supply air tempera-
tures. The table below provides the blower off timings that
will result from different switch settings.
TABLE 7
Blower Off Delay Switch Settings
Blower Off Delay
(Seconds)
60
90
120
180
Switch 3 −− Second Stage Delay (Used with Single−
Stage Thermostat Only) −− This switch is used to deter-
mine the second stage on delay when a single−stage ther-
mostat is being used. The switch is factory−set in the ON
position, which provides a 10−minute delay before second−
stage heat is initiated. If the switch is toggled to the OFF
position, it will provide a 15−minute delay before second−
stage heat is initiated. This switch is only activated when
the E20 thermostat selector jumper is positioned for
SINGLE−stage thermostat use.
Switch 4 −− Not used in G61MPV application.
Switches 5 and 6 −− Cooling Mode Blower Speed −−
Switches 5 and 6 are used to select second stage cooling
blower motor speed (first stage cooling speed is 70% of
second stage). The unit is shipped from the factory with the
dip switches positioned for high speed (4) indoor blower
motor operation during the cooling mode. The table below
provides the cooling mode blower speeds that will result
from different switch settings. Refer to blower data tables at
the front of this manual for corresponding cfm values.
TABLE 8

Cooling Mode Blower Speeds

Speed
1 − Low
2 − Medium Low
3 − Medium High
4 − High (Factory)
Switches 7 and 8 −− Blower Speed Adjustment −−
Switches 7 and 8 are used to select blower speed adjust-
ment settings. The unit is shipped from the factory with the
dip switches positioned for NORMAL (no) adjustment. The
Switch 1 Switch 2
Off Off
Off On
On Off
On On
Switch 5 Switch 6
On On
Off On
On Off
Off Off
dip switches may be positioned to adjust the blower speed
by +10% or −10% to better suit the application. The table
below provides blower speed adjustments that will result
from different switch settings. Refer to blower data tables at
the front of this manual for corresponding cfm values.
Blower Speed Adjustment
Adjustment
+10% (approx.)
NORMAL (Factory)
−10% (approx.)
Switches 9 and 10 −− Cooling Mode Blower Speed
Ramping −− Switches 9 and 10 are used to select cooling
mode blower speed ramping options. Blower speed ramp-
ing may be used to enhance dehumidification perfor-
mance. The switches are factory set at option A which has
the greatest effect on blower motor performance. The table
below provides the cooling mode blower speed ramping
options that will result from different switch settings. The
cooling mode blower speed ramping options are detailed
below.

Cooling Mode Blower Speed Ramping

Ramping Option
A (Factory)
B
C
D

COOLING MODE RAMPING OPTIONS

Ramping Option A (Factory Selection)
S Motor runs at 50% for 30 seconds.
S Motor then runs at 82% for approximately 7−1/2 min-
utes. If demand has not been satisfied after 7−1/2 min-
utes, motor runs at 100% until demand is satisfied.
S Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
7 1/2 MIN
OFF
82% CFM
1/2 MIN
50% CFM
Ramping Option B
S Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
S Once demand is met, motor ramps down to stop.
7 1/2 MIN
OFF 82%CFM
Page 28
TABLE 9
Switch 7 Switch 8
On
Off
Off
TABLE 10
Switch 9 Switch 10
Off
On
Off
On
100%
CFM
1/2 MIN
50% CFM
COOLING DEMAND
100% CFM
COOLING DEMAND
Off
Off
On
Off
Off
On
On
OFF
OFF