Rheem RRNL-B, Installation Instructions Manual

Page: 38 / 108

D. UNIT OPERATION WITH TWO-STAGE COOLING
The RRRL unit provides distinct airflows for two-stage cooling. (See Figure 28.) Unit opera-
tion is defined as:
• Y1 – First Stage Cooling
• Y2 – Second Stage Cooling
A 24VAC signal provides input for the cooling stages.
NOTE: A 24VAC input to the Y2 terminal overrides the input to the Y1 terminal. (Both must be
energized to enable 2nd stage cooling.)
E. COOLING AIRFLOW ADJUSTMENTS
Cooling airflow may be ad10% or –10% from nominal airflow using switches 3 & 4.
Refer to Figure 33 for switch positions to achieve the desired adjustments in airflow.
NOTE: Continuous fan speed is NOT affected by switches 3 & 4.
IMPORTANT: The use of On Demand Dehumidification overrides the cooling airflow adjust-
ments when high humidity is detected by a dehumidifying thermostat or humidistat when con-
nected to the ODD terminal as shown in Figure 28. Refer to the Cooling Mode
Dehumidification section for more information.
38
FIGURE 30
COOLING AIRFLOW ADJUSTMENTS
COOLING
SELECTION SWITCH 3 SWITCH 4 AIRFLOW
POSITION POSITION ADJUSTMENT
A OFF OFF NONE
B ON OFF 10%
C OFF ON -10%
D ON ON NONE
O
N O
N O
N O
N
A
3 4 3 4 3 4 3 4
B C D
TABLE 8
LED FLASH CODES
Interface board
DIP switch
settiings
1200 CFM
600 CFM
950 CFM
LED Output
• Flashes 12 times
• Illuminate dimly 10 seconds, repeat sequence
• Flashes 6 times
• Illuminate dimly 10 seconds, repeat sequence
• Flashes 9 times, flash once for
1
/
2
second
• Illuminate dimly 10 seconds, repeat sequence
TABLE 9
TWO-STAGE OPERATION
Y1
INPUT
NONE
24 VAC
24 VAC
NONE
Y2
INPUT
NONE
NONE
24 VAC
24 VAC
COOLING
OPERATION
OFF
1 ST STAGE
2 ND STAGE
OFF