Lennox Humiditrol L Series User manual

504,417M
*P504417M*
08/01
*2P0801*
2001
Litho U.S.A.
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a qualified installer, ser
vice agency or t e gas supplier
INSTALLATION
INSTRUCTIONS
Humiditrolt
LGA/LCA036H,
048H, & 060H
(3, 4, & 5 TON)
504,417M
8/2001
Superse es 4/2001
L SERIES PACKAGED UNITS
Table of Contents
DIMENSIONS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARTS ARRANGEMENTS 2. . . . . . . . . . . . . . . . . . . . . . . . .
SHIPPING AND PACKING LIST 3. . . . . . . . . . . . . . . . . . . . .
GENERAL 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UNIT SUPPORT 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DUCT CONNECTION 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSATE DRAINS 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
CONNECT GAS PIPING 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
PRESSURE TEST GAS PIPING 5. . . . . . . . . . . . . . . . . . . .
HIGH ALTITUDE DERATE 6. . . . . . . . . . . . . . . . . . . . . . . . . .
FACTORY−INSTALLED OPTIONS 6. . . . . . . . . . . . . . . . . . .
ELECTRICAL CONNECTIONS 7. . . . . . . . . . . . . . . . . . . . .
BLOWER OPERATION AND ADJUSTMENTS 9. . . . . . . .
COOLING START−UP 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATING START−UP 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATING OPERATION AND ADJUSTMENTS 18. . . . . . . .
HUMIDITROLt START−UP AND OPERATION 19. . . . . . . .
SERVICE 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
LGA SHOWN

Page 1
LGA/LCA036−072 Unit Dimensions − Inc es (mm)
FIGURE 1
OPTIONAL POWER
EXHAUST FAN
(Field Installed)
Down−flow
Applications Only
TOP VIEW
FRONT VIEW
TOP VIEW BASE SECTION
BACK VIEW
BOTTOM
POWER ENTRY
5 x 8 (127 x 203)
BLOWER
EVAPORATOR
COIL
CONDENSER COIL
361/2
(927)
BLOWER
MOTOR
CONTROL
BOX
HORIZONTAL
RETURN AIR OPENING
BOTTOM
RETURN AIR
OPENING
31/4
(83)
331/4
(845) CONDENSER
COIL
CONDENSER
COIL
INTAKE
AIR
CONDENSER
COIL INTAKE
AIR
BOTTOM
SUPPLY AIR
OPENING
COMPRESSOR
LIFTING
HOLES
(For Rigging
Bot Sides)
FORKLIFT SLOTS
(Front, Back & Blower End)
Base
HORIZONTAL
SUPPLY AIR OPENING
871/2
(2223)
41/2
(114)
41/2
(114)
41/2
(114)
41/2
(114)
28
(711)
28
(711)
14 (356)
14
(356)
86
(2184)
61/8
(156)
41/2 (114)
*W en Factory Installed Disconnect is Not Used.
28
(711)
28
(711)
14 (356)
14
(356)
OPTIONAL OUTDOOR
AIR HOOD (Factory or
Field Installed)
Base
461/2
(1181)
EXHAUST
AIR
OUTDOOR
AIR
15
(381)
END VIEW
(Economizer/Outdoor Air Dampers)
CONDENSATE
DRAIN
EVAPORATOR COIL
BLOWER
45
(1143)
51/8 (130)
243/4
(629)
FILTERS
OPTIONAL
OUTDOOR
AIR HOOD
(Factory or
Field
Installed)
OPTIONAL GRAVITY
EXHAUST HOOD
(Field Installed)
OPTIONAL ECONOMIZER DAMPERS
Or OUTDOOR AIR DAMPERS
(Factory or Field Installed)
OPTIONAL GRAVITY
EXHAUST DAMPERS
(Factory or Field
Installed)
EXHAUST
AIR
OUTDOOR
AIR
15
(381)
END VIEW
(Power Ex aust)
CONDENSATE
DRAIN
EVAPORATOR COIL
BLOWER
45
(1143)
51/8 (130)
241/4
(616)
FILTERS
OPTIONAL OUTDOOR
AIR HOOD
(Factory or Field
Installed)
OPTIONAL ECONOMIZER DAMPERS
(Factory or Field Installed)
311/2
(800)
BLOWER
HEAT
EXCHANGER
(Optional electric
eat in LCA units)
CENTER OF
GRAVITY
GAS
INLET
FLUE/VENT
OUTLET
COMBUSTION
AIR INTAKE
14 (356)
OPTIONAL DISCONNECT
(Factory Installed)
*ELECTRICAL INLET
(Low Voltage)
FLUE/VENT
OUTLET
COMBUSTION
AIR INTAKE
4
(102)
*ELECTRICAL INLET
(Hig Voltage)
321/4
(819)
1/4 (6)
OPTIONAL
115 VOLT OUTLET
(Factory Installed)
REHEAT
COIL
REHEAT COIL REHEAT COIL

Page 2
LGA/LCA036−072 Parts Arrangement
FIGURE 2
LGA
CONDENSER FAN
COMPRESSOR
CONDENSATE
DRAIN BLOWER
TB1
LCA
FILTERS
ELECTRIC
HEAT
(OPTIONAL)
CONDENSER FAN
HEAT EXCHANGER
COMPRESSOR
EVAPORATOR COIL
BLOWER
TB1
COMBUSTION
AIR INDUCER
GAS VALVE
BURNERS
FILTERS
DISCONNECT
(OPTIONAL)
ECONOMIZER
(OPTIONAL)
120V GFI OUTLET
(OPTIONAL)
CONDENSATE
DRAIN
ECONOMIZER
(OPTIONAL)
DISCONNECT
(OPTIONAL)
120V GFI OUTLET
(OPTIONAL)
REHEAT COIL
EVAPORATOR COIL
REHEAT COIL

Page 3
S ipping and Packing List
Package 1 of 1 contains:
1− Assemble unit
IMPORTANT − This unit requires a specific
field−provided and installed humidity sensor
(17M50).
Check unit for shipping amage. Consult last carrier
imme iately if amage is foun .
General
These instructions are inten e as a general gui e an
o not superse e national or local co es in any way.
Authorities having juris iction shoul be consulte before
installation.
In a ition to stan ar heating an cooling, Humi itrolt
units provi e a ehumi ifying mo e of operation. Refer to
Reheat Operation section.
See figure 1 for unit imensions, figure 2 for parts
arrangement an figure 3 for service clearances.
EVAP. COND.
FAN
BLOWER
HEAT
SEC
TION
COMP.
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉ
LGA/LCA036−072 SERVICE CLEARANCES
36"
36" 36"
FIGURE 3
36"
IMPORTANT
T e Clean Air Act of 1990 bans t e intentional vent
ing of refrigerant (CFC’s and HCFC’s) as of July 1,
1992. Approved met ods of recovery, recycling or
reclaiming must be followed. Fines and/or incar
ceration may be levied for non−compliance.
CAUTION
Danger of s arp metallic edges. Can cause injury.
Take care w en servicing unit to avoid accidental
contact wit s arp edges.
WARNING
Electric s ock azard and danger of
explosion. Can cause injury, deat or
product or property damage. Turn off
gas and electrical power to unit before
performing any maintenance or
servicing operations on t e unit.
Follow lig ting instructions attac ed
to unit w en putting unit back into
operation and after service or
maintenance.
Unit Support
A−Roof Mounting wit LARMF − Downflow Disc arge
Application
1− The LARMF roof mounting frame must be installe ,
flashe an seale in accor ance with the
instructions provi e with the frame.
2− The LARMF roof mounting frame shoul be square
an level to 1/16" per linear foot (5mm per linear
meter) in any irection.
3− Duct must be attache to the roof mounting frame
an not to the unit: Supply an return plenums must
be installe before setting the unit.
B−Roof Mounting Wit Installer’s Frame − Downflow
Applications
Many types of roof frames can be use to mount the unit,
epen ing upon ifferent roof structures. Items to keep in
min when using the buil ing frame or supports are:
1− The base is fully enclose an insulate , so an
enclose frame is not require .
2− The frames or supports must be constructe with
non−combustible materials an shoul be square an
level to 1/16" per linear foot (5mm per linear meter) in
any irection.
3− Frame or supports must be high enough to prevent
any form of moisture from entering unit.
Recommen e frame height is 14" (356mm).
4− Duct must be attache to the roof mounting frame
an not to the unit: Supply an return plenums must
be installe before setting the unit.

Page 4
5− Units require support along all four si es of unit base.
Supports must be constructe of steel or suitably
treate woo materials.
NOTE−When installing the unit on a combustible surface
for downflow discharge applications, the LARM roof
mounting frame is required.
C−Horizontal Disc arge Applications
1− Specifie installation clearances must be maintaine
when mounting units. Refer to figure 3.
2− Top of support slab shoul be at least 4" (102mm)
above the finishe gra e an locate so no run−off
water from higher groun can collect aroun the unit.
3− Units are shippe in ownflow position. Convert to
horizontal ischarge as follows:
a−Remove horizontal return air cover an rear heat
section panel.
b−Secure horizontal return air cover over ownflow
return air opening.
c−Remove horizontal supply air cover from rear heat
section panel. Cut insulation to match horizontal
supply air opening. Use foil tape to secure cut e ges
of insulation to supply air opening. Secure horizontal
supply air cover over ownflow supply air opening.
Replace rear heat section panel.
4− Units require support along all four si es of unit base.
Supports must be constructe of steel or suitably
treate woo materials.
NOTE − Securely fasten roof frame to roof per local codes.
Duct Connection
All exterior ucts, joints, openings in roof or buil ing walls
must be insulate an weather−proofe with flashing an
sealing compoun s in accor ance with applicable co es.
Any uct passing through an uncon itione space must
be insulate .
CAUTION
In downflow applications, do not drill or punc
oles in base of unit. Leaking in roof may occur if
unit base is punctured.
Rigging Unit For Lifting
Rig unit for lifting by attaching four cables to holes in unit
base rail. See figure 4.
1− Detach woo en base protection before rigging.
2− Connect rigging to the unit base using both holes in
each corner.
3− All panels must be in place for rigging.
4− Place fiel provi e Hstyle pick in place just above
top e ge of unit. Frame must be of a equate
strength an length. (H−style pick prevents amage
to top of unit.
UNIT
WEIGHT
UNIT
LBS. KGS.
LGA036 841 382
LGA048 925 420
LGA060 935 424
LCA036 830 377
LCA048 860 390
LCA060 870 395
FIGURE 4
CAUTION − Do not
walk on unit.
IMPORTANT − ALL
PANELS MUST BE IN
PLACE OR RIGGING.
RIGGING
LIFTING POINT SHOULD
BE DIRECTLY ABOVE
CENTER OF GRAVITY
*Maximum weight with all avail
able factory−installe accessories.

Page 5
Condensate Drains
Make rain connection to the 3/4" N.P.T. rain nipple
provi e on unit. A trap must be installe between rain
connection an an open vent for proper con ensate
removal. See figure 5. It is sometimes acceptable to rain
con ensate onto the roof or gra e; however, a tee shoul
be fitte to the trap to irect con ensate ownwar . The
con ensate line must be vente . Check local co es
concerning con ensate isposal. Refer to figures 1 an 2
for con ensate rain location.
FIGURE 5
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
Á
UNIT
Minimum Pitc
1" (25mm) per
10’ (3m) of line
MOUNTING FRAME
OPEN VENT
CONDENSATE DRAIN CONNECTION
CAULK AROUND
CONDENSATE
COUPLING
Connect Gas Piping
Before connecting piping, check with gas company or
authorities having juris iction for local co e
requirements. When installing gas supply piping, length
of run from gas meter must be consi ere in etermining
pipe size for 0.5" w.c. maximum pressure rop. Do not
use supply pipe smaller than unit gas connection. For
natural gas units, operating pressure at the unit gas
connection must be a minimum of 5.5" w.c. an a
maximum of 10.5" w.c. For propane gas units, operating
pressure at the unit gas connection must be a minimum
of 11" w.c. an a maximum of 13.0" w.c.
When making piping connections, a rip leg shoul be
installe on vertical pipe runs to serve as a trap for
se iment or con ensate. A 1/8" N.P.T. plugge tap in
fiel piping accessible for test gauge connection must
be provi e upstream of gas supply connection to the
unit. Install a groun joint union between the gas
control manifol an the main manual shut−off valve.
See figure 6.
Compoun s use on threa e joints of gas piping shall
be resistant to the action of liquifie petroleum gases.
GAS PIPING
SUPPORT
UNIT
FIGURE 6
FIELD PROVIDED
1/8" PRESSURE TAP
GROUND
JOINT UNION
MANUAL MAIN
SHUT−OFF VALVE
(REFER TO
LOCAL
CODES)
DRIP LEG
UNIT
SUPPORT
GAS PIPE CONNECTION
Pressure Test Gas Piping
When pressure testing gas lines, the gas valve must be
isconnecte an isolate . Gas valves can be amage if
subjecte to more than 0.5 psig (14" w.c.). See figure 7.
If the test pressure is equal to or less than 0.5 psig (14"
w.c.), use the main manual shut−off valve before pressure
testing to isolate the unit from the gas supply system. If
necessary, a just main gas supply pressure in
accor ance with Connect Gas Pipe" section.
GAS VALVE
CAP
MANUAL MAIN
SHUT−OFF VALVE
FIGURE 7
PRESSURE TEST GAS VALVE
NOTE−Codes may require that manual main shut−off valve
and union (furnished by installer) be installed in gas line
external to unit. Union must be of the ground joint type.
After all connections have been ma e, check all piping
connections for gas leaks. Also check existing gas
connections up to the gas valve; loosening may occur
uring installation. Use a soap solution or other preferre
means. Do not use matches, can les, or other sources of
ignition to check for gas leaks.
NOTE−In case emergency shut down is required, turn off
the main manual shut−off valve and disconnect main
power to unit. These devices should be properly labeled
by the installer.

Page 6
Hig Altitude Derate
Units must be erate when installe at altitu es above
4500 feet (610 m) above sea level. At altitu es above
4500 feet (610 m), units must be erate to match the gas
manifol pressures shown in table 1.
NOTEThis is the only permissible derate for these units.
TABLE 1
Altitude ft (m)
Gas Manifold Pressure−in. w.g. (kPa)
Altitude − ft. (m) Natural LP (Propane)
4501−5500 (1372−1676) 3.4 (0.85) 10.2 (2.54)
5501−6500 (1676−1981) 3.3 (0.82) 9.8 (2.44)
6501−7500 (1981−2286) 3.2 (0.80) 9.5 (2.36)
Factory−Installed Options
A−Economizer
The A56 EM1 economizer boar controls economizer
operation an provi es potentiometers to control
minimum amper position an enthalpy control
a justments. The economizer boar is positione on the
A55 M1 main control boar in the unit control box. See the
Integrate Mo ular Control Gui e for economizer
operation an a justments.
Intake hoo parts an supply air filters are shippe in the
filter section. Remove intake hoo package from filter
channels. Remove filters from unit an sli e into filter
channels. If the filters have a metal frame, remove the
car boar shipping pa protecting the evaporator coil.
B−Intake Hood
The intake hoo top panel is secure to the unit. The
intake hoo si es, filters, an three support brackets are
shippe unassemble in the filter compartment.
Assemble hoo an install as follows:
1− Remove screws securing si e flanges of top hoo to
unit. See figure 8.
2− Pivot top hoo open an secure si es of intake hoo
to top of hoo using three sheet metal screws on each
si e. See figure 8.
3− Align two holes on intake hoo si e panel with two
holes on bottom filter bracket. See figure 9. Secure
both si es of bottom filter bracket to hoo si es with
sheet metal screws.
4− Secure intake hoo si es to unit.
5− Secure top filter bracket to hoo top flange as shown
in figure 9. Sli e filter into flanges an install spacers
on either si e of filter.
FIGURE 8
INTAKE HOOD
HOOD TOP
HOOD
SIDE
UNIT
TOP SEAL
HOOD TOP
NOTE: CAULK EACH SIDE
OF TOP SEAL (FIELD PRO
VIDED)
FIGURE 9
HOOD SIDE VIEW
ALIGN VERTICAL HOLES ON
BRACKET WITH VERTICAL
HOLES ON SIDE OF HOOD
BOTTOM FILTER
BRACKET
HOOD TOP
TOP FILTER
BRACKET
FILTER
HOOD TOP SEAL

Page 7
Electrical Connections − Power Supply
Do not apply power or close isconnect switch until
installation is complete. Refer to start−up irections. Refer
closely to unit wiring iagram.
Refer to unit nameplate for minimum circuit ampacity an
maximum overcurrent protection.
1− All units are factory wire . For 208V supply,
isconnect the orange wire (230V) at control power
transformer. Reconnect the re wire (208V). Tape the
expose en of the 230V orange wire.
Units Wit out Optional Disconnect
1− The unit is provi e with power entry knockouts
through the base an the blower section mullion (see
page 1).
2− Horizontal Power Entry − Remove necessary
electrical knockouts on blower section mullion.
Bottom Power Entry −
Route wires through knockout on power entry cover.
NOTE − It may be necessary to punch larger holes for
power wiring (refer to current NEC/CEC requirements).
3− Install a equate isconnect switch external to unit in
accor ance with local or national co es as
applicable.
Units Wit Factory−Installed GFI
1− Remove necessary electrical knockouts in unit.
2− Make power wiring connections in bottom power
entry box.
3− Connect separate 120v wiring to GFCI outlet pigtails
in han y box on front left corner mullion.
Electrical Connections − Control Wiring
A−T ermostat Location
Room thermostat mounts vertically on any
non−con uctive flat surface.
Locate thermostat approximately 5 feet (1.5m) above the
floor in an area with goo air circulation at average
temperature. Avoi locating the room thermostat where it
might be affecte by:
− rafts or ea spots behin oors an in corners
−hot or col air from ucts
−ra iant heat from sun or units
−conceale pipes an chimneys
B−Control Wiring
1− Route thermostat cable or wires from subbase
through con uit provi e in unit. Refer to wiring
iagram on unit. For thermostat wire runs up to 60 feet
(18m), use 18 gauge wire. For 60 to 90 feet (18 to
27m) runs, use 16 gauge wire.
2− Install thermostat an humi ity sensor in
accor ance with instructions provi e with
thermostat or sensor. See figure 11 to wire units set
in local thermostat mo e. See figure 12 for units
wire in zone sensor mo e.
2− Install thermostat assembly in accor ance with
instructions provi e with thermostat.
IMPORTANT−Terminal connections at the wall plate or
subbase must be made securely. Loose control wire
connections may allow unit to operate but not with proper
response to room demand.
C−Commercial Controls Platform
Units without an optional factory−installe control system
may use a variety of ifferent temperature control systems.
The unit has a pre−wire jack−plug platform allowing a
variety of control systems to plug−in" to unit jack−plugs.
Control systems which have the mating commercial
controls platform jack−plug contain a control system wiring
iagram C" section. This iagram section is use with unit
an accessory iagram sections for total system
operation. Affix iagrams to unit in alpha−numeric or er as
shown in figure 10. Refer closely to installation instructions
provi e with each temperature control system for proper
unit operation.
FIGURE 10
COMPLETE SYSTEM DIAGRAM
A"
Heating
Section
B"
Unit
Section
C"
Control
Section
D"
Economizer
Section

Page 8
12 18
FIGURE 11
24 VOLT FIELD WIRING WITH IMC SET IN LOCAL THERMOSTAT MODE (ECTO 6.01 OPTION 0)
3 4 5 6 7 8 9 101112131415 1617
TB1
NOT ALL TERMINALS
ARE FOUND ON ALL
THERMOSTATS
A2
Note − On electro−mechanical ther
mostats set anticipator at 0.1 amps.
JUMPER TERMINALS 8 & 9
WHEN THERMOSTAT HAS NO
NIGHT SETBACK TERMINALS
19 20 21
VOUT
GND
VIN
A91 HUMIDITY
SENSOR
Connect
s ield drain to
unit TB1−7
12 18
FIGURE 12
24 VOLT FIELD WIRING IN ZONE SENSOR MODE (ECTO 6.01 OPTION 1, 2, OR 3)
3 4 5 6 7 8 9 101112131415 1617
TB1
19 20 21
VOUT
GND
VIN
A91 HUMIDITY SENSOR
*Terminals are located on
combination RH/temperature
sensors only. A2 sensor is
not required w en combina
tion sensor is used.
A2 SENSOR
*
*
Connect
s ield drain to
unit TB1−16
Connect
s ield drain to
unit TB1−7

Page 9
Blower Operation and Adjustments
NOTE − These units must not be used as a construction
heater" at any time during any phase of construction.
Very low return air temperatures, harmful vapors, and
misplacement of the filters will damage the unit and its
efficiency. Additionally, a unit which will be subject to cold
temperatures when not in operation must have a vapor
barrier installed to seal the duct connections. ailure to
protect the unit from moisture laden air or harmful vapors
(generated from the construction process and
temporary combustion heating equipment) will cause
corrosive condensation within the unit. ailure to
properly protect the unit in this situation will cause
electrical and electronic component failure and could
affect the unit warranty status.
A−Blower Operation
1− Blower operation is manually set at the thermostat
subbase fan switch. With fan switch in ON position,
blowers will operate continuously.
2− With fan switch in AUTO position, the blower will cycle
with eman . Blower an entire unit will be off when
system switch is in OFF position.
B−Determining Unit CFM
1− The following measurements must be ma e with a
ry in oor coil. Run blower without a cooling eman .
Air filters must be in place when measurements are
taken.
2− Measure static pressure external to unit (from supply
to return).
3− Measure the in oor blower wheel RPM.
4− Refer to unit nameplate to etermine the blower
motor horse power.
5− Referring to table 2 or 3, use the static pressure an
RPM rea ings to etermine unit CFM.
6− The CFM can be a juste at the motor pulley (see
section C−Blower Belt A justment).
C−Blower Belt Adjustment
Maximum life an wear can be obtaine from belts only if
proper pulley alignment an belt tension are maintaine .
Important−Tension new belt after a 24−48 hour period of
operation. This will allow belts to stretch and seat
grooves. To increase belt tension, loosen 2 locking bolts
and pull mounting plate. Tighten motor mounting plate in
vertical position. See figure 13.
FIGURE 13
BLOWER SPEED ADJUSTMENT
BLOWER
WHEEL
MOTOR & PULLEY
TO INCREASE CFM
LOOSEN ALLEN SCREW &
TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
TO INCREASE BELT TENSION
1 − Loosen 2 locking bolts.
2 − Pull motor mounting plate.
3 − Tighten motor mounting plate so plate is vertical.
MOTOR MOUNTING PLATE
LOCKING BOLTS
BELT
SET
SCREW
KEY
D−C eck Belt Tension
Overtensioning belts shortens belt an bearing life.
Check belt tension as follows:
1− Measure span length X. See figure 14.
2− Apply perpen icular force to center of span (X) with
enough pressure to eflect belt 1/64" for every inch of
span length or 1.5mm per 100mm of span length.
Example: Deflection istance of a 40" span woul be
40/64" or 5/8".
Example: Deflection istance of a 400mm span
woul be 6mm.
3− Measure belt eflection force. For a use belt, the
eflection force shoul be 5 lbs. (35kPa) . A new belt
eflection force shoul be 7 lbs. (48kPa).
A force below these values in icates an
un ertensione belt. A force above these values
in icates an overtensione belt.
MEASURE BELT TENSION
FIGURE 14
DEFLECTION 1/64" PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FORCE

Page 10
TABLE 2
LGA036−072 BELT DRIVE BLOWER PERFORMANCE
Air
Vol
TOTAL STATIC PRESSURE  Inc es Water Gauge (Pa)
Vol
ume .00 (00) .20 (50) .40 (100) .60 (150) .80 (200) 1.00 (250) 1.20 (300) 1.40 (350) 1.60 (400) 1.80 (450)
ume
cfm
(L/s) RPM BHP
(kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW)
900
(425)
350 0.05
(0.04)
495 0.10
(0.07)
630 0.20
(0.15)
750 0.30
(0.22)
855 0.40
(0.30)
950 0.60
(0.45)
1035 0.75
(0.56)
1120 1.00
(0.75)
1195 1.25
(0.93)
1270 1.50
(1.12)
1000
(470)
375 0.10
(0.07)
515 0.15
(0.11)
645 0.20
(0.15)
760 0.30
(0.22)
860 0.45
(0.34)
955 0.60
(0.45)
1040 0.75
(0.56)
1120 1.00
(0.75)
1195 1.20
(0.90)
1270 1.45
(1.08)
1100
(520)
400 0.10
(0.07)
535 0.15
(0.11)
665 0.25
(0.19)
775 0.35
(0.26)
870 0.45
(0.34)
960 0.60
(0.45)
1045 0.75
(0.56)
1125 0.95
(0.71)
1200 1.20
(0.90)
1270 1.45
(1.08)
1200
(565)
430 0.15
(0.11)
560 0.20
(0.15)
680 0.25
(0.19)
785 0.35
(0.26)
885 0.50
(0.37)
970 0.65
(0.48)
1055 0.80
(0.60)
1130 1.00
(0.75)
1205 1.20
(0.90)
1275 1.45
(1.08)
1300
(615)
460 0.20
(0.15)
590 0.25
(0.19)
700 0.30
(0.22)
805 0.40
(0.30)
895 0.50
(0.37)
985 0.65
(0.48)
1065 0.85
(0.63)
1140 1.00
(0.75)
1210 1.20
(0.90)
1280 1.45
(1.08)
1400
(660)
490 0.20
(0.15)
615 0.30
(0.22)
725 0.35
(0.26)
820 0.45
(0.34)
910 0.55
(0.41)
995 0.70
(0.52)
1075 0.85
(0.63)
1150 1.05
(0.78)
1220 1.25
(0.93)
1285 1.45
(1.08)
1500
(710)
525 0.30
(0.22)
645 0.35
(0.26)
745 0.40
(0.30)
840 0.50
(0.37)
930 0.65
(0.48)
1010 0.75
(0.56)
1085 0.90
(0.67)
1160 1.10
(0.82)
1225 1.25
(0.93)
1295 1.50
(1.12)
1600
(755)
560 0.35
(0.26)
670 0.40
(0.30)
770 0.50
(0.37)
860 0.60
(0.45)
945 0.70
(0.52)
1025 0.80
(0.60)
1100 0.95
(0.71)
1170 1.15
(0.86)
1240 1.30
(0.97)
1305 1.50
(1.12)
1700
(800)
595 0.40
(0.30)
700 0.45
(0.34)
795 0.55
(0.41)
885 0.65
(0.48)
965 0.75
(0.56)
1040 0.90
(0.67)
1115 1.05
(0.78)
1185 1.20
(0.90)
1250 1.40
(1.04) −−−
1800
(850)
630 0.50
(0.37)
730 0.55
(0.41)
820 0.65
(0.48)
905 0.75
(0.56)
985 0.85
(0.63)
1060 1.00
(0.75)
1130 1.10
(0.82)
1200 1.30
(0.97)
1265 1.45
(1.08) −−−
1900
(895)
665 0.55
(0.41)
760 0.65
(0.48)
850 0.75
(0.56)
930 0.85
(0.63)
1005 0.95
(0.71)
1080 1.05
(0.78)
1150 1.20
(0.90)
1215 1.35
(1.01)
1275 1.55
(1.16) −−−
2000
(945)
700 0.65
(0.48)
790 0.75
(0.56)
875 0.85
(0.63)
955 0.95
(0.71)
1030 1.05
(0.78)
1100 1.20
(0.90)
1165 1.30
(0.97)
1230 1.45
(1.08)
1295 1.65
(1.23) −−−
2100
(990)
735 0.75
(0.56)
825 0.85
(0.63)
905 0.95
(0.71)
980 1.05
(0.78)
1050 1.15
(0.86)
1120 1.30
(0.97)
1185 1.45
(1.08)
1250 1.60
(1.19)
1310 1.75
(1.31) −−−
2200
(1040)
770 0.85
(0.63)
855 0.95
(0.71)
930 1.05
(0.78)
1005 1.15
(0.86)
1075 1.30
(0.97)
1140 1.40
(1.04)
1205 1.55
(1.16)
1265 1.70
(1.27) −−− −−−
2300
(1085)
805 1.00
(0.75)
885 1.10
(0.82)
960 1.20
(0.90)
1030 1.30
(0.97)
1100 1.40
(1.04)
1165 1.55
(1.16)
1225 1.70
(1.27)
1285 1.85
(1.38) −−− −−−
2400
(1135)
840 1.15
(0.86)
920 1.25
(0.93)
990 1.35
(1.01)
1060 1.45
(1.08)
1125 1.55
(1.16)
1190 1.70
(1.27)
1250 1.85
(1.38)
1305 2.00
(1.49) −−− −−−
2500
(1180)
875 1.25
(0.93)
950 1.40
(1.04)
1020 1.50
(1.12)
1085 1.60
(1.19)
1150 1.75
(1.31)
1210 1.85
(1.38)
1270 2.00
(1.49) −−− −−− −−−
2600
(1225)
910 1.45
(1.08)
980 1.55
(1.16)
1050 1.65
(1.23)
1115 1.75
(1.31)
1175 1.90
(1.42)
1235 2.05
(1.53)
1295 2.20
(1.64) −−− −−− −−−
2700
(1275)
945 1.60
(1.19)
1015 1.70
(1.27)
1080 1.85
(1.38)
1145 1.95
(1.45)
1205 2.10
(1.57)
1260 2.20
(1.64)
1320 2.40
(1.79) −−− −−− −−−
2800
(1320)
980 1.80
(1.34)
1050 1.90
(1.42)
1110 2.05
(1.53)
1170 2.15
(1.60)
1230 2.30
(1.72)
1285 2.40
(1.79) −−− −−− −−− −−−
2900
(1370)
1015 2.00
(1.49)
1080 2.10
(1.57)
1140 2.25
(1.68)
1200 2.35
(1.75)
1260 2.50
(1.87)
1315 2.65
(1.98) −−− −−− −−− −−−
3000
(1415)
1050 2.20
(1.64)
1115 2.35
(1.75)
1175 2.45
(1.83)
1230 2.60
(1.94)
1285 2.70
(2.01) −−− −−− −−− −−− −−−
Bold italics indicates field−furnished drive.
NOTES − 1) Fiel −installe rive kits are available for RPM ranges liste in table 10. Installer must provi e rives for air requirements outsi e of these
ranges. 2) Units are not approve by U.L. for operation above 1325 rpm.

Page 11
TABLE 3
LCA036−072 BELT DRIVE BLOWER PERFORMANCE
Air
Vl
TOTAL STATIC PRESSURE  Inc es Water Gauge (Pa)
Air
Volume
cfm
.00 (00) .20 (50) .40 (100) .60 (150) .80 (200) 1.00 (250) 1.20 (300) 1.40 (350) 1.60 (400) 1.80 (450)
c
f
m
(L/s) RPM BHP
(kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW) RPM BHP (kW)
900
(427)
310 0.05
(0.04)
455 0.10
((0.07)
595 0.15
(0.11)
720 0.25
(0.19)
825 0.40
(0.30)
925 0.55
(0.41)
1015 0.70
(0.52)
1100 0.90
(0.67)
1180 1.10
(0.82)
1255 1.30
(0.97)
1000
(474)
330 0.05
(0.04)
470 0.10
(0.07)
605 0.20
(0.15)
725 0.30
(0.22)
830 0.40
(0.30)
925 0.55
(0.41)
1015 0.70
(0.52)
1095 0.90
(0.67)
1175 1.10
(0.82)
1250 1.30
(0.97)
1100
(521)
350 0.05
((0.04)
485 0.15
(0.11)
615 0.20
(0.15)
730 0.30
(0.22)
830 0.40
(0.30)
925 0.55
(0.41)
1015 0.75
(0.56)
1095 0.95
(0.67)
1170 1.10
(0.82)
1245 1.30
(0.97)
1200
(568)
375 0.10
(0.07)
505 0.15
(0.11)
630 0.25
(0.19)
740 0.35
(0.26)
840 0.45
(0.34)
930 0.60
(0.45)
1015 0.75
(0.56)
1095 0.90
(0.67)
1170 1.10
(0.82)
1240 1.30
(0.97)
1300
(615)
400 0.10
(0.07)
525 0.20
(0.15)
645 0.25
(0.19)
750 0.35
(0.26)
845 0.50
(0.37)
935 0.60
(0.45)
1020 0.80
(0.60)
1095 0.95
(0.71)
1170 1.10
(0.82)
1240 1.30
(0.97)
1400
(663)
425 0.15
(0.11)
545 0.20
(0.15)
660 0.30
(0.22)
760 0.40
(0.30)
855 0.50
(0.37)
940 0.65
(0.48)
1020 0.80
(0.60)
1100 0.95
(0.71)
1170 1.10
(0.82)
1240 1.35
(1.01)
1500
(710)
450 0.15
(0.11)
570 0.25
(0.19)
675 0.35
(0.26)
775 0.45
(0.34)
865 0.55
(0.41)
950 0.70
(0.52)
1030 0.85
(0.63)
1105 1.00
(0.75)
1175 1.20
(0.90)
1245 1.40
(1.04)
1600
(757)
475 0.20
(0.15)
590 0.30
(0.22)
695 0.40
(0.30)
790 0.50
(0.37)
875 0.60
(0.45)
960 0.75
(0.56)
1035 0.90
(0.67)
1110 1.05
(0.78)
1180 1.25
(0.93)
1245 1.40
(1.04)
1700
(804)
505 0.25
(0.19)
615 0.35
(0.26)
715 0.45
(0.34)
805 0.55
(0.41)
890 0.65
(0.48)
970 0.80
(0.60)
1045 0.95
(0.71)
1115 1.10
(0.82)
1185 1.30
(0.97)
1250 1.45
(1.80)
1800
(850)
535 0.30
(0.22)
640 0.40
(0.30)
735 0.50
(0.37)
820 0.60
(0.45)
905 0.70
(0.52)
980 0.85
(0.63)
1055 1.00
(0.75)
1125 1.15
(0.86)
1195 1.35
(1.01)
1255 1.50
(1.12)
1900
(899)
565 0.35
(0.26)
665 0.45
(0.34)
755 0.55
(0.41)
840 0.65
(0.48)
920 0.80
(0.60)
995 0.90
(0.67)
1065 1.05
(0.78)
1135 1.25
(0.93)
1200 1.40
(1.04)
1265 1.60
(1.19)
2000
(945)
595 0.40
(0.30)
690 0.50
(0.37)
775 0.60
(0.45)
860 0.70
(0.52)
935 0.85
(0.63)
1010 1.00
(0.75)
1080 1.15
(0.86)
1145 1.30
(0.97)
1210 1.50
(1.12)
1270 1.65
(1.23)
2100
(993)
625 0.45
(0.34)
715 0.55
(0.41)
800 0.70
(0.52)
875 0.80
(0..60)
950 0.90
(0.67)
1025 1.05
(0.78)
1090 1.20
(0.90)
1155 1.40
(1.04)
1220 1.55
(1.16)
1280 1.75
(1.31)
2200
(1040)
655 0.55
(0.41)
740 0.65
(0.48)
820 0.75
(0.56)
895 0.85
(0.63)
970 1.00
(0.75)
1040 1.15
(0.86)
1105 1.30
(0.97)
1170 1.45
(1.08)
1230 1.65
(1.23)
1290 1.85
(1.38)
2300
(1087)
685 0.60
(0.45)
765 0.70
(0.52)
845 0.85
(0.63)
920 0.95
(0.71)
990 1.10
(0.82)
1055 1.25
(0.93)
1120 1.40
(1.04)
1185 1.55
(1.16)
1245 1.75
(1.31)
1305 1.95
(1.45)
2400
(1135)
710 0.70
(0.52)
790 0.80
(0.60)
870 0.95
(0.71)
940 1.05
(0.78)
1010 1.20
(0.90)
1075 1.35
(1.01)
1135 1.50
(1.12)
1200 1.70
(1.27)
1260 1.85
(1.38)
1315 2.05
(1.53)
2500
(1182)
740 0.80
(0.60)
820 0.90
(0.67)
890 1.05
(0.78)
960 1.15
(0.86)
1030 1.30
(0.97)
1090 1.45
(1.08)
1155 1.60
(1.19)
1215 1.80
(1.34)
1270 1..95
(1.45) −−−
2600
(1229)
770 0.90
(0.67)
845 1.00
(0.75)
915 1.15
(0.86)
985 1.30
(0.97)
1050 1.40
(1.04)
1110 1.55
(1.16)
1170 1.75
(1.31)
1230 1.90
(1.42)
1285 2.10
(1.57) −−−
2700
(1276)
800 1.00
(0.75)
875 1.10
(0.82)
940 1.25
(0.93)
1005 1.40
(1.04)
1070 1.55
(1.16)
1130 1.70
(1.27)
1190 1.85
(1.38)
11245 2.05
(1.53)
1300 2.20
(1.64) −−−
2800
(1323)
830 1.10
(0.82)
900 1.25
(0.93)
965 1.35
(1.01)
1030 1.50
(1.12)
1090 1.65
(1.23)
1150 1.85
(1.38)
1210 2.00
(1.49)
1265 2.20
(1.64)
1320 2.35
(1.75) −−−
2900
(1371)
860 1.20
(0.90)
930 1.35
(1.01)
990 1.50
(1.12)
1055 1.65
(1.23)
1115 1.80
(1.34)
1170 1.95
(1.45)
1225 2.15
(1.60)
1280 2.30
(1.72) −−− −−−
3000
(1418)
890 1.35
(1.01)
955 1.50
(1.12)
1015 1.65
(1.23)
1075 1.80
(1.34)
1135 1.95
(1.45)
1190 2.10
(1.57)
1245 2.30
(1.72)
1300 2.50
(1.87) −−− −−−
Bold italics indicates field−furnished drives.
NOTES − 1) Fiel −installe rive kits are available for RPM ranges liste in table10. Installer must provi e rives for air requirements outsi e of these
ranges. 2) Units are not approve by U.S. for operation over 1325 rpm.

Page 12
E−Blower Table Notes
Blower tables inclu e resistance for base units only with
two−row ry in oor coil an air filters in place. For all other
units:
Determine total system esign static pressure, then a :
1− Wet in oor coil air resistance of selecte unit.
2− Any factory installe options air resistance (electric
heat, economizer, etc.). See table 4.
3− Any fiel installe accessories air resistance
(horizontal roof frame, iffuser, etc.). See tables 5
through 9.
Use the blower table to etermine blower motor
output an rives require .
F−Field−Furnis ed Blower Drives
For fiel −furnishe blower rives, use tables 2 or 3 to
etermine BHP an RPM require . Reference table 10 to
etermine the rive number an table 11 to etermine the
manufacturer’s mo el number.
TABLE 4
ACCESSORY AIR RESISTANCE
Air Volume
Total Resistance  inc es water gauge (Pa)
Air Volume Wet Indoor Coil
cfm L/s
LCA/LGA
036S/036H/042S/
042H/048S/060S
LCA/LGA
048H/060H/072S LCA/LGA072H
Electric Heat
(LCA Models) Economizer
800 380 0.02 (4) 0.04 (9) 0.05 (13) 0.04 (10) 0.04 (10)
1000 470 0.02 (4) 0.05 (12) 0.07 (18) 0.06 (15) 0.04 (10)
1200 565 0.03 (8) 0.06 (16) 0.09 (24) 0.09 (22) 0.04 (10)
1400 660 0.04 (10) 0.08 (21) 0.12 (31) 0.12 (30) 0.04 (10)
1600 755 0.05 (13) 0.10 (26) 0.15 (38) 0.16 (40) 0.04 (10)
1800 850 0.06 (16) 0.12 (31) 0.18 (46) 0.21 (52) 0.05 (12)
2000 945 0.07 (18) 0.14 (36) 0.21 (53) 0.25 (62) 0.05 (12)
2200 1040 0.09 (21) 0.17 (42) 0.25 (62) 0.31 (77) 0.05 (12)
2400 1135 0.11 (27) 0.19 (48) 0.28 (70) 0.37 (92) 0.05 (12)
2600 1225 0.013 (32) 0.22 (54) 0.31 (77) 0.43 (107) 0.06 (15)
2800 1320 0.16 (40) 0.25 (63) 0.36 (88) 0.50 (125) 0.06 (15)
3000 1415 0.20 (50) 0.29 (71) 0.41 (101) 0.58 (144) 0.06 (15)
TABLE 5
CEILING DIFFUSER AIR RESISTANCE
Air Volume
Total Resistance  inc es water gauge (Pa)
Air Volume RTD9 StepDown Diffuser
FD9 Flus
RTD11 StepDown Diffuser FD11
cfm L/s 2 Ends
Open
1 Side
2 Ends Open
All Ends &
Sides Open
FD9 Flus
Diffuser 2 Ends
Open
1 Side
2 Ends Open
All Ends &
Sides Open
FD11
Flus
Diffuser
800 380 0.15 (37 0.13 (32) 0.11 (27) 0.11 (27) − − − − − − − − − − − − − − − −
1000 470 0.19 (47 0.16 (40) 0.14 (35) 0.14 (35) − − − − − − − − − − − − − − − −
1200 565 0.25 (62 0.20 (50) 0.17 (42) 0.17 (42) − − − − − − − − − − − − − − − −
1400 660 0.33 (82 0.26 (65) 0.20 (50) 0.20 (50) − − − − − − − − − − − − − − − −
1600 755 0.43 (107 0.32 (80) 0.20 (50) 0.24 (60) − − − − − − − − − − − − − − − −
1800 850 0.56 (139 0.40 (100) 0.30 (75) 0.30 (75) 0.13 (32) 0.11 (27) 0.09 (22) 0.09 (22)
2000 945 0.73 (182 0.50 (125) 0.36 (90) 0.36 (90) 0.15 (37) 0.13 (32) 0.11 (27) 0.10 (25)
2200 1040 0.95 (237 0.63 (157) 0.44 (110) 0.44 (110) 0.18 (45) 0.15 (37) 0.12 (30) 0.12 (30)
2400 1135 − − − − − − − − − − − − − − − − 0.21 (52) 0.18 (45) 0.15 (37) 0.14 (35)
2600 1225 − − − − − − − − − − − − − − − − 0.24 (60) 0.21 (52) 0.18 (45) 0.17 (42)
2800 1320 − − − − − − − − − − − − − − − − 0.27 (67) 0.24 (60) 0.21 (52) 0.20 (50)
3000 1415 − − − − − − − − − − − − − − − − 0.32 (80) 0.29 (72) 0.25 (62) 0.25 (62)

Page 13
TABLE 6
RTD9−65 CEILING DIFFUSER AIR RESISTANCE
Air Volume Effective T row
cfm L/s ft. m
1000 470 10−17 3−5
1200 565 11−18 3−5
1400 660 12−19 4−6
1600 755 12−20 4−6
1800 850 13−21 4−6
2000 945 14−23 4−7
2200 1040 16−25 5−8
Effective throw base on terminal velocities of 75 ft. (22.9 m) per minute.
TABLE 7
RTD11−95 CEILING DIFFUSER AIR RESISTANCE
Air Volume Effective T row
cfm L/s ft. m
2600 1225 24−29 7−9
2800 1320 25−30 8−9
3000 1415 27−33 8−10
3200 1510 28−35 9−11
3400 1605 30−37 9−11
Effective throw base on terminal velocities of 75 ft. (22.9 m) per minute.
TABLE 8
FD9−65 CEILING DIFFUSER AIR RESISTANCE
Air Volume Effective T row  ft. (m)
cfm L/s ft. m
1000 470 15−20 5−6
1200 565 16−22 5−7
1400 660 17−24 5−7
1600 755 18−25 5−7
1800 850 20−28 6−9
2000 945 21−29 6−9
2200 1040 22−30 7−9
Effective throw base on terminal velocities of 75 ft. (22.9 m) per minute.
TABLE 9
FD11−95 CEILING DIFFUSER AIR RESISTANCE
Air Volume Effective T row
cfm L/s ft. m
2600 1225 19−24 6−7
2800 1320 20−28 6−9
3000 1415 21−29 6−9
3200 1510 22−29 7−9
3400 1605 22−30 7−9
Effective throw base on terminal velocities of 75 ft. (22.9 m) per minute.
TABLE 10
FACTORY INSTALLED DRIVE KIT SPECIFICATIONS
Motor Outputs RPM Range
Nominal p Maximum p Nominal kW Maximum kW Drive 1 Drive 2 Drive 3 Drive 4
Stan ar or High Efficiency − 1.5 1.72 1.1 1.3 615 − 920 800 − 1105 − − − − − − − −
Stan ar or High Efficiency − 2 2.3 1.5 1.7 − − − − − − − − 920 − 1230 − − − −
Stan ar Efficiency Only − 3 3.45 2.2 2.6 − − − − − − − − − − − − 1070 − 1325
TABLE 11
MANUFACTURER’S NUMBERS
DRIVE
DRIVE COMPONENTS
DRIVE
NO
ADJUSTABLE SHEAVE FIXED SHEAVE BELTS (1 REQUIRED)
N
O
.
BROWNING NO. OEM PART NO. BROWNING NO. OEM PART NO. BROWNING NO. OEM PART NO.
1 1VP34x7/8 31K6901 AK59x1 31K6801 AX43 73K8201
21VP40x7/8 79J0301 AK59x1 31K6801 AX43 73K8201
3 1VP44x7/8 P−8−1488 AK59x1 31K6801 AX44 12L2601
41VP44x7/8 P−8−1488 AK51x1 18L2201 AX43 73K8201

Page 14
Cooling Start−Up
IMPORTANT−The crankcase heater (standard on
some models) must be energized for 24 hours before
attempting to start compressor. Set thermostat so there
is no demand to prevent compressor from cycling.
Apply power to unit.
A−Preliminary C ecks
1− Make sure that unit is installe in accor ance with the
installation instructions an applicable co es.
2− Inspect all electrical wiring, both fiel an factory
installe , for loose connections. Tighten as require .
3− Check to ensure that refrigerant lines o not rub
against the cabinet or against other refrigerant lines.
4− Check voltage at isconnect switch. Voltage must
be within range liste on nameplate. If not, consult
power company an have voltage con ition
correcte before starting unit.
5− Refer to unit iagram locate on insi e of
compressor access oor for unit wiring.
6− A just blower belt or blower spee tap accor ing to
Blower Operation an A justments" section.
7− Make sure filters are in place before startup.
B−Start−Up
1− Set fan switch to AUTO or ON an move system
selection switch to cool. A just thermostat to a
setting below room temperature to bring on the
compressor. Compressor will start an cycle on
eman from thermostat.
2− The refrigerant circuit is charge with HCFC−22
refrigerant. See unit rating plate for correct
amount of charge.
3− Refer to Cooling Operation an A justment section
for proper metho to check refrigerant charge.
C−T ree P ase Scroll Compressor Voltage P asing
Three phase scroll compressors must be phase
sequentially to ensure correct compressor an blower
rotation an operation. Compressor an blower are
wire in phase at the factory
1− Observe suction an ischarge pressures an
blower rotation on unit start−up.
2− Suction pressure must rop, ischarge pressure
must rise, an blower rotation must match rotation
marking.
If pressure ifferential is not observe or blower rotation is
not correct:
3− Disconnect all remote electrical power supplies.
4− Reverse any two fiel −installe wires connecte to
the line si e of S48 isconnect or TB2 terminal strip.
Do not reverse wires at blower contactor.
5− Make sure the connections are tight.
Discharge an suction pressures shoul operate at
their normal startup ranges.
D−C arging/C ecking C arge
WARNING−Do not exceed nameplate c arge under any
condition.
This unit is factory charge an shoul require no further
a justment. If the system requires charge, reclaim the
charge, evacuate the system, an add required
nameplate charge.
NOTE − System charging is not recommended below 60_
(15_C). In temperatures below 60_ (15_C), the charge
must be weighed into the system.
If weighing facilities are not available, or to check the
charge, use the following proce ure:
IMPORTANT − C arge unit in standard cooling mode.
1− Attach gauge manifol s an operate unit in cooling
mo e until system stabilizes (approximately five
minutes). Make sure all out oor air ampers are close .
2− Use a thermometer to accurately measure the
out oor ambient temperature.
3− Apply the out oor temperature to tables 12 through
14 to etermine normal operating pressures.
4− Compare the normal operating pressures to the
pressures obtaine from the gauges. Minor
variations in these pressures may be expecte ue to
ifferences in installations. Significant ifferences
coul mean that the system is not properly charge or
that a problem exists with some component in the
system. Correct any system problems before
proceeding.
5− If ischarge pressure is high, remove refrigerant from
the system. If ischarge pressure is low, a
refrigerant to the system.
SA or remove charge in increments.
SAllow the system to stabilize each time refrigerant is
a e or remove .
6− Use the following subcooling metho along with the
normal operating pressures to confirm rea ings.

Page 15
TABLE 12
LGA/LCA036H Humiditrolt Units
Outdoor Coil
Entering Air Temp
DIsc arge
+10 psig
Suction +5
psig
65_F153 79
75_F182 81
85_F211 82
95_F240 83
105_F269 85
115_F298 86
TABLE 13
LGA/LCA048H Humiditrolt Units
Outdoor Coil
Entering Air Temp
DIsc arge
+10 psig
Suction +5
psig
65_F157 75
75_F188 77
85_F219 79
95_F249 81
105_F280 83
115_F310 85
TABLE 14
LGA/LCA060H Humiditrolt Units
Outdoor Coil
Entering Air Temp
DIsc arge
+10 psig
Suction +5
psig
65_F169 72
75_F201 74
85_F233 76
95_F265 79
105_F297 81
115_F329 84
E−C arge Verification − Subcooling Met od
If ambient temperature is above 60_F (15_C), rea
liqui line temperature. Rea liqui line pressure from
gauge an convert to con ensing temperature using
stan ar R−22 temperature/pressure conversion chart
(or conversion scale on gauge). The ifference
between the con ensing temperature an the liqui line
temperature is subcooling (subcooling = con ensing
temperature minus liqui line temperature). The
subcooling shoul approximate the value given in table
15. A refrigerant to increase subcooling an remove
refrigerant to re uce subcooling.
TABLE 15
SUBCOOLING
Unit Temperature
LGA/LCA036H Humi itrol Units 14_F + 1 (7.7_C + 1)
LGA/LCA048H Humi itrol Units 16_F + 1 ( 9_C + 1)
LGA/LCA060H Humi itrol Units 15_F + 1 (8.3_C + 1)
F−Compressor Controls
1− High Pressure Switch (S4)
The compressor circuit is protecte by a reset high
pressure switch which cuts out at 450 psig + 10 psig
(3103 kPa + 70 kPa) an automatically resets at 300
psig + 20 psig (2096 kPa + 138 kPa).
2− Low Pressure Switch (S87)
The compressor circuit is protecte by a loss of
charge switch. Switch cuts out at 25 psig (172 kPa)
an automatically resets at 55 psig (379 kPa).
3− Freezestat (S49)
The compressor is protecte by a freezestat locate
on the in oor coil. The freezestat opens at 29_F+3
an closes at 58_F+4.
4− Compressor Crankcase Heater (HR1)
Crankcase heater must be energize at all times to
prevent compressor amage ue to refrigerant
migration. Energize crankcase heater 24 hours before
unit start−up by setting thermostat so that there is no
cooling eman (to prevent compressor from cycling)
an apply power to unit.
5− Low Ambient Pressure Switch (S11)
Switch maintains a equate ischarge pressure by
e−energizing con enser fan when liqui pressure
falls below 140 psig + 10 (965 kPa + 6). S11 is
installe in the liqui line.
6− Discharge Line Thermostat (S40)
Single Phase and High Efficiency Units Only
Switch opens when ischarge line temperature
reaches 94_F +5 an closes when temperature falls
below 74_F +5. Prevents crankcase heater operation
in warm weather.

Page 16
Heating Start−Up
FOR YOUR SAFETY READ BEFORE LIGHTING
BEFORE LIGHTING smell all aroun the unit area for
gas. Be sure to smell next to the floor because some gas
is heavier than air an will settle on the floor.
Use only your han to push in or turn the gas control
knob. Never use tools. If the knob will not push in or turn
by han o not try to repair it. Call a qualifie service
technician. Force or attempte repair may result in a
fire or explosion.
This unit is equippe with an automatic spark ignition
system. There is no pilot. In case of a safety shut own,
move thermostat switch to OFF an return the
thermostat switch to HEAT to reset the ignition control.
WARNING
SMOKE POTENTIAL
T e eat exc anger in t is unit could be a source of
smoke on initial firing. Take precautions wit re
spect to building occupants and property. Vent ini
tial supply air outside w en possible.
WARNING
Danger of explosion. Can cause injury
or product or property damage. If
over eating occurs or if gas supply
fails to s ut off, s ut off t e manual gas
valve to t e unit before s utting off
electrical supply.
WARNING
Electric s ock azard. Can cause injury
or deat . Do not use t is unit if any part
as been under water. Immediately call
a qualified service tec nician to inspect
t e unit and to replace any part of t e
control system and any gas control
w ic as been under water.
WARNING
Electric s ock azard. Can cause
injury or deat . Before attempting to
perform any service or maintenance,
turn t e electrical power to unit OFF at
disconnect switc (es). Unit may ave
multiple power supplies.
WARNING
Danger of explosion and fire. Can cause
injury or product or property damage.
You must follow t ese instructions
exactly.
A−Placing Unit In Operation
Gas Valve Operation for W ite Rodgers 36C (figure
15), W ite Rodgers 36E (figure 16), Honeywell
VR8205M (figure 17), and Honeywell
VR8205Q/VR8305Q (figure 18)
FIGURE 15
WHITE RODGERS 36C76 GAS VALVE
D−1
GV−1 C−1
C2
GV−2
GAS VALVE SHOWN
IN OFF" POSITION
MANIFOLD
PRESSURE
TAP
STAGE 2 MANUAL MANIFOLD
PRESSURE ADJUSTMENT
SCREW UNDER CAP
INLET
PRESSURE
TAP
WHITE RODGERS 36E GAS VALVE
NO
OFF
Gas valve knob is shown
in OFF position.
FIGURE 16
MANIFOLD
PRESSURE
TAP (SIDE)
INLET
PRESSURE
TAP (SIDE)

Page 17
ON
OFF
HONEYWELL VR8205M SERIES GAS VALVE
Gas valve knob is shown in OFF position.
FIGURE 17
MANIFOLD
PRESSURE
TAP
INLET
PRESSURE
TAP
HONEYWELL VR8205Q/VR8305Q SERIES GAS VALVE
Gas valve knob is shown in OFF position.
FIGURE 18
LOW FIRE
ADJUSTMENT
HIGH FIRE
ADJUSTMENT
INLET
PRESSURE
TAP
MANIFOLD
PRESSURE
TAP
1− Set thermostat to lowest setting.
2− Turn off all electrical power to appliance.
3− This appliance is equippe with an ignition evice
which automatically lights the burner. Do not try to
light the burner by han .
4− Open or remove the heat section access panel.
5− 36C, VR8205, & VR8305 −
Turn the knob on the gas valve clockwise to
OFF". Depress 36C knob slightly. Do not force.
36E −
Turn the knob 180³ either way to OFF".
6− Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Imme iately call your
gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions. If you o not smell gas, go to
the next step.
7− 36C, VR8205, & 8305 −
Turn the knob on the gas valve counterclockwise
to ON". Do not force.
36E −
Turn the knob 180³ either way to ON".
8− Close or replace the heat section access panel.
9− Turn on all electrical power to appliance.
10− Set thermostat to esire setting.
11− The combustion air in ucer will start. The burners will
light within 40 secon s.
12− If the appliance oes not light the first time (gas line
not fully purge ), it will attempt up to two more
ignitions before locking out.
13− If lockout occurs, repeat steps 1 through 10.
14− If the appliance will not operate, follow the
instructions Turning Off Gas to Appliance" an call
your service technician or gas supplier.
Turning Off Gas to Appliance
1− If using an electromechanical thermostat, set to the
lowest setting.
2− Before performing any service, turn off all electrical
power to the appliance.
3− Open or remove the heat section access panel.
4− 36C, VR8205, & VR8305 −
Turn the knob on the gas valve clockwise to
OFF". Depress 36C knob slightly. Do not force.
36E −
Turn the knob 180³ either way to OFF".
5− Close or replace the heat section access panel.
WARNING
Danger of explosion. Can cause injury or
deat . Do not attempt to lig t manually.
Unit as a direct spark ignition system.

Page 18
Heating Operation and Adjustments
A−Heating Sequence of Operation
1− When the thermostat calls for heat, the combustion
air blower starts imme iately.
2− The combustion air switch checks for proper blower
operation before allowing power to the ignition
controller. This switch is factory set an no
a justment is necessary.
3− After a pre−purge of 45 secon s, the spark ignitor is
energize , an the solenoi valve opens in the gas
valve.
4− The spark then ignites the gas, the ignition sensor
proves the flame an the combustion process
continues.
5− In the event that the flame is not etecte after the
first trial for ignition, the controller will repeat steps 3
an 4 up to two more times ( epen ing upon
controller mo el) before locking out.
6− For troubleshooting purposes, an ignition attempt
after lock out may be re−establishe manually. Move
thermostat OFF" an return thermostat switch to
HEAT" position.
B−Limit Control
Limit controls are factory set an not a justable.
Two primary limits are locate on the ivision panel
between the return an supply sections on high heat
units. One primary limit is locate on the ivision panel on
stan ar heat units.
A secon ary limit is locate on the blower transition in
both stan ar an high heat units.
C−Heating Adjustment
1− Main burners are factory a juste for proper flame.
Air shutters are provi e for localize areas if
necessary.
2− Burner flames may be observe through the
inspection port in the access panel. Always operate
the unit with the access panel in place.
WARNING
Danger of explosion. Can cause injury or
deat . Do not overtig ten main burner
mounting screws. Snug tig ten only.
3− The gap on the flame sensing electro e shoul be
between 3/32" an 5/32" (0.094 − 0.156 mm).
Remove right burner by removing screw an sli ing
the burner off the orifice. The carry over slot on all
burners is 1/8" (.125 mm) an it must be maintaine .
Clean the carry over slot using a strip of 16 gauge
steel. Check gap with 1/8" (.125mm) twist rill.
Replace all burners using mounting screws.
4− Gas manifol pressure shoul be set at 3.5" w.c. for
natural gas units an 10.5" w.c. for LP gas units.
Units must be erate when installe at altitu es
above 4500 feet (610 m) above sea level. At
altitu es above 4500 feet (610 m), units must be
erate to match the gas manifol pressures
shown in table 16.
NOTEThis is the only permissible derate for these units.
TABLE 16
Altitude − ft (m)
Gas Manifold Pressure−in. w.g. (kPa)
Altit
u
d
e −
ft
.
(
m
)
Natural LP (Propane)
4501−5500 (1372−1676) 3.4 (0.85) 10.2 (2.54)
5501−6500 (1676−1981) 3.3 (0.82) 9.8 (2.44)
6501−7500 (1981−2286) 3.2 (0.80) 9.5 (2.36)

Page 19
Humiditrolt Start−Up And Operation
General
Humi itrol units provi e a ehumi ifying mo e of
operation. These units contain a reheat coil a jacent to
an ownstream of the evaporator coil. Reheat coil
solenoi valve, L14, routes hot ischarge gas from the
compressor to the reheat coil. Return air pulle across
the evaporator coil is coole an ehumi ifie ; the
reheat coil a s heat to supply air. See figure 19 for
reheat refrigerant routing an figure 20 for stan ar
cooling refrigerant routing.
REHEAT MODE REFRIGERANT ROUTING
REHEAT
COIL
EVAPORATOR
REHEAT
VALVE
RETURN
AIR
CONDENSER
COIL
OUTDOOR
AIR
COMPRESSOR
SUPPLY
AIR
CHECK
VALVE
EXPANSION
VALVE
FIGURE 19
COIL
COOLING MODE REFRIGERANT ROUTING
REHEAT
COIL
EVAPORATOR
REHEAT
VALVE
RETURN
AIR
CONDENSER
COIL
OUTDOOR
AIR
COMPRESSOR
SUPPLY
AIR
CHECK
VALVE
EXPANSION
VALVE
FIGURE 20
COIL