Ruud (-)GLL Series, Installation Instructions Manual

Page: 27 / 44

27
2nd stage heat satisfied, 1st stage
heat still required.
R and W2 thermostat contacts open.
The induced draft motor switches to low
speed, the main blower motor switches
to low speed and the gas valve
changes to low fire. The furnace
continues to run in this mode until the
1st stage heat call is satisfied. The
system will shut down as noted in “c,”
under 1st stage call for heat.
INTEGRATED FURNACE
CONTROL & ECM MOTOR
SETTINGS
These furnaces have ECM blower
motors. These motors deliver a constant
level of air flow over a wide range of
external static pressures (0.1 to 0.8
W.C.). The interface board, found
beside the furnace integrated control
board, provides the required
communications between the main
integrated furnace control and the ECM
blower motor. There is a bank of 4 dip
switches on the integrated furnace
control which controls the blower off
timings. See section on BLOWER OFF
TIMINGS FOR ECM MOTORS and
Figure 22 for proper switch settings.
There is a bank of 12 dip switches on
the interface board which define the
operation of the ECM motor. Only the
first eleven switches are used for this
application. See Figure 20. These
switches (except for switches 9 and 12)
are actually broken down into five dip
switch pairs. Switches 1 and 2 act as a
pair as do switches 3 and 4, 5 and 6, 7
and 8, and 10 and 11. The assignments
of the switch pairs are shown in Table 11.
*IMPORTANT: Only traditional
humidistats will work with this feature.
Dehumidistats will not work properly
with this feature.
+See Page 27 under Dehumidification.
HEATING AIRFLOW
ADJUSTMENTS
The furnace is shipped with low and
high fire heating airflows. These are
set from the factory to let the furnace
operate at the mid point of the
temperature rise range. The
temperature may vary slightly due to
furnace input and voltage variations.
The installer is given the option of three
air flow options in the heating mode as
shown in Table 12. Switches 1 and 2
on the interface control regulate the
steady state heating mode airflow.
In the heating mode, the ECM motor is
programmed to ramp up to its target
CFM over a fifteen (15) second period.
After any of the user selected “Off”
delays, see Figures 25 and 26, the
ECM motor will ramp down to 50% of
steady state CFM for approximately
thirty (30) seconds. The motor will then
ramp down to an off position.
*NOTE: Airflow for models (-)GPL-
07EBRKR and (-)GLL-07EBRKR
cannot be adjusted to give a rise lower
than mid-rise on high fire.
COOLING AIRFLOW
ADJUSTMENTS
The furnace motor is programmed to
provide cooling airflows of 1
1
⁄
2
, 2, 2
1
⁄
2
and 3 tons in the (-)GPL/LL-05 EBMKR
and -07 EBRKR units. Airflows of 2
1
⁄
2
,
3, 3
1
⁄
2
, and 4 tons are available in the
(-)GPL/LL-07 EBRQR units. Airflows of
3, 3
1
⁄
2
, 4 and 5 tons are available in the
-10 EBRMR and -12 EARMR units.
See Tables 14 and 16 for airflow
options. Furnaces are shipped from the
factory set for maximum cooling
airflow. Adjustments to the cooling
airflow may be made using switches 7
and 8 as shown in Table 13.
TABLE 11
SWITCHES FUNCTION
1 & 2 Heating Airflow
3 & 4 Cooling Off/On Delay
Profiles
5 & 6 Nominal Cooling/Heat Pump Air Flow
7 & 8+ Latent/Sensible Airflow Adjustment
9 Continuous Fan Airflow
10 & 11* On Demand
Dehumidification
Settings
12 Not Used
TABLE 12
HEATING AIR FLOW SELECTIONS
(SWITCHES 1 & 2)
Switch Temperature
Selection Rise °F
A Mid-Rise
B Mid-Rise
C* Mid-Rise –10°F
D Mid-Rise + 10°F
FIGURE 21
FIGURE 20
FIGURE 22
BLOWER OFF TIMINGS
UTEC 1095 - 101 CONTROL WITH
INTERFACE BOARD AND ECM MOTOR
NOTE: SWITCH #3 MUST BE IN OFF
POSITION.
ON
NORMAL ECM
LOW HIGH COOLING COOLING SWITCH SWITCH
FIRE FIRE SWITCH 4 ON 1 2
#4 OFF
80 50 30 0 OFF ON
110 80 40 30 OFF OFF
150 120 60 20 ON OFF
170 140 90 50 ON ON
TABLE 13
AIR FLOW ADJUSTMENT (SWITCHES 7 & 8)
Switch Air Flow
Selection Adjustment
A No Adjustment
B +10%
C -10%
D No Adjustment