Lennox LCH036 Installation Instructions Manual page 13

INSTALLATIONS WITH DUCTWORK
ROOFTOP UNIT
SUPPLY
TURN
MAIN
DUCT RUN
Parameter
036 H4E
SETUP > TEST & BALANCE > BLOWER
HIGH SPEED
LOW SPEED
SETUP > TEST & BALANCE > DAMPER
BLOWER ON HIGH
BLOWER ON LOW
SETTINGS > RTU OPTIONS > EDIT PARAMETER = 6
BLOWER SMOKE OUT­
PUT
Installer: Circle applicable unit model number and record any parameter changes under "Field Setting" column. Settings need to be recorded by
installer for use when Unit Controller is replaced or reprogrammed.
TABLE 4
MINIMUM AIRFLOW-LC UNITS WITH ELECTRIC HEAT
(BELT DRIVE)
Kw
Downflow & Horizontal Airflow
LCH036HE
LCH048HE
LCH060HE
C-Adjusting Unit CFM - Direct Drive Blowers
The supply CFM can be adjusted by changing Unit
Controller settings. Refer to table 3. Adjustments can also
be made by using optional software. Record any CFM
changes on the parameter settings label located on the
inside of the compressor access panel.
LGH/LCH036, 048, 060, 072
LOCATION OF STATIC PRESSURE READINGS
RETURN AIR
READING LOCATION
RE­
FIRST BRANCH
OFF OF MAIN RUN
SUPPLY AIR
READING
LOCATION
036, 048, 060 DIRECT DRIVE PARAMETER SETTINGS
LGH/LCH Unit Factory Default Settings
048 H4E 060 H4E
55% 30% 59%
28% 40% 36%
10% 10 % 10 %
15 % 15 % 15 %
55% 80% 59%
CFM
1080
1280
1600
INSTALLATIONS WITH CEILING DIFFUSERS
ROOFTOP UNIT
SUPPLY AIR
READING
LOCATION
FIGURE 19
TABLE 3
036-060 S4T
Not Applicable
Not Applicable
10 %
Not Applicable
Not Applicable
Note - To adjust CFM on units configured for optional
"Advanced Air Flow Control", refer to Advanced Air Flow
Control Start-Up section.
D-Adjusting Unit CFM - Belt Drive Blowers
The blower RPM can be adjusted at the motor pulley.
Loosen Allen screw and turn adjustable pulley clockwise
to increase CFM. Turn counterclockwise to decrease
CFM. See figure 20. Do not exceed minimum and
maximum number of pulley turns as shown in table 5.
MINIMUM AND MAXIMUM PULLEY ADJUSTMENT
Belt
A Section
Page 13
RETURN AIR
RE­
SUPPLY
TURN
DIFFUSER
Field Setting Description
Percentage torque for
indoor blower high speed.
Percentage torque for
indoor blower low speed.
Minimum damper position
during high speed blower
operation.
Minimum damper position
during low speed blower op­
eration.
Percentage torque for
indoor blower smoke
speed.
TABLE 5
Min. Turns Open Maxi. Turns Open
No minimum
READING
LOCATION
5