Lennox LGT Series Installation and operation manual
Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional HVAC
installer or equivalent, service agency, or the gas
supplier
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
Table of Contents
Options / Accessories . . . . . . . . . . . . . . . . . . . . . Page 2
Blower Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . Page 13
I-Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 14
II-Placement and Installation . . . . . . . . . . . . . . . Page 29
III-Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29
IV-Start Up - Operation . . . . . . . . . . . . . . . . . . . . Page 34
V-System Service Checks . . . . . . . . . . . . . . . . Page 36
VI-Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 39
VII-Accessories . . . . . . . . . . . . . . . . . . . . . . . Page 39
VIII-Direct Drive Supply Air Blower . . . . . . . . . . Page 49
WARNING
To prevent serious injury or death:
1- Lock-out/tag-out before performing maintenance.
2- If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove
fan belt where applicable, and ensure all
controllers and thermostats are set to the “OFF”
position before performing maintenance.
3- Always keep hands, hair, clothing, jewelry, tools,
etc., away from moving parts.
(CTO) with a wide selection of factory-installed options.
sections are designed with aluminized steel tube heat ex-
changers with stainless steel as an option.
are equipped with two compressors.
All models are equipped with direct drive blowers. The
blower will operate at lower speeds when demand is low
and increase to higher speeds when demand is high. The
following examples show the model numbers of tenton
units with all available blower options:
LGT12w are equipped with all aluminum condenser
coils with one two stage scroll compressor and one
nameplate. Operating pressures and pressure switch set-
-
-
ent energy management thermostat control systems with
-
tions connect to the unit with jack plugs. When ”plugged
in” the controls become an integral part of the unit wiring.
Information contained in this manual is intended for use
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.
four cables to the holes located in the unit base rail (two
holes at each corner). Refer to the installation instructions
for the proper rigging technique.
LGT SERIES
7.5 to 12.5 ton
LGT092H through 150H
Page 2
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
092 102 120 150
COOLING SYSTEM
Condensate Drain Trap PVC 22H54 OX OX OX OX
Copper 76W27 XXXX
21Z07 OX OX OX OX
HEATING SYSTEM
Bottom Gas Piping Kit 54W95 XXXX
Combustion Air Intake Extensions 19W51 XXXX
OOOO
OOOO
OOOO
22A51 XXXX
22A55 XXXX
13X65 XXXX
LPG/Propane Conversion Kits 14N22 XXXX
14N23 XXXX
14N25 XXXX
OOOO
Vertical Vent Extension Kit 42W16 XXXX
BLOWER - SUPPLY AIR
DirectPlus™ Blower System with MSAV® OOOO
DirectPlus™ Blower System with VAV OOOO
CABINET
24C85 OX OX OX OX
Corrosion Protection OOOO
51W25 XXXX
54W96 OX OX OX OX
CONTROLS
Blower Proving Switch 21Z10 OX OX OX OX
Commercial Controls CPC Einstein Integration OOOO
LonTalk®Module 54W27 OX OX OX OX
Novar® LSE OOOO
53W67 OX OX OX OX
21Z08 OX OX OX OX
Smoke Detector - Supply or Return (Power board and one sensor) 11K76 OX OX OX OX
Smoke Detector - Supply and Return (Power board and two sensors) 11K80 OX OX OX OX
Page 3
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
092 102 120 150
INDOOR AIR QUALITY
Air Filters
®
MERV 8 50W61 OX OX OX OX
MERV 13 52W41 OX OX OX OX
MERV 16 21U41 XXXX
Y3063 XXXX
Indoor Air Quality (CO) Sensors
77N39 XXXX
23V86 XXXX
87N52 XXXX
87N54 XXXX
CO 85L43 XXXX
Aspiration Box - for duct mounting non-plenum rated COsensors (77N39)90N43 XXXX
Needlepoint Bipolar Ionization (NPBI)
Needlepoint Bipolar Ionization (NPBI) Kit 22U15 XXXX
UVC Germicidal Lamps
1® 21A93 XXXX
Step-Down Transformers 10H20 XXXX
10H21 XXXX
ELECTRICAL
OOOO
OOOO
OOOO
OOOO
OOOO
Disconnect Switch 54W56 OX OX OX OX
54W57 OX OX OX OX
Outlets
74M70 OX OX OX OX
OOOO
67E01 XXXX
³) OOOO
10C89 XXXX
1
be used to directly power the UVC ballast(s).
2
3
Page 4
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
092 102 120 150
ECONOMIZER
20U80 OX OX OX OX
Horizontal Barometric Relief Dampers
53K04 XXXX
Economizer Controls
Order 2 21Z09 OX OX OX OX
Sensible Control OOOO
Single Enthalpy 21Z09 OX OX OX OX
Building Pressure Control 13J77 XXXX
13J76 XXXX
Global Control OOOO
OUTDOOR AIR
Outdoor Air Dampers With Outdoor Air Hood
Motorized 14G28 OX OX OX OX
Manual 14G29 XXXX
POWER EXHAUST
Standard Static 53W44 OX OX OX OX
53W45 OX OX OX OX
53W46 OX OX OX OX
HUMIDITROL®CONDENSER REHEAT OPTION
OOOO
17M50 XXXX
ROOF CURBS
8 in. height 11F54 XXXX
14 in. height 11F55 XXXX
18 in. height 11F56 XXXX
24 in. height 11F57 XXXX
14 in. height 54W50 XXXX
CEILING DIFFUSERS
Step-Down - Order one 13K61 X
13K62 X X
13K63 X
13K56 X
13K57 X X
13K58 X
Transitions (Supply and Return) - Order one 12X65 X
12X66 X X
12X67 X
SPECIFICATIONS MSAV MODELS
General Data Nominal Tonnage 7.5 Ton 8.5 Ton 10 Ton 12.5 Ton
High High High High
Model Number LGT092H4E LGT102H4E LGT120H4E LGT150H4E
Blower Type DirectPlus™
ECM Direct Drive
with MSAV®
DirectPlus™
ECM Direct Drive
with MSAV®
DirectPlus™
ECM Direct Drive
with MSAV®
DirectPlus™
ECM Direct Drive
with MSAV®
Cooling
Performance
Gross Cooling Capacity - Btuh
1Net Cooling Capacity - Btuh
1
Total Unit Power - kW 8.1
1IEER (Btuh/Watt) 14.6
1EER (Btuh/Watt) 12.3 12.1 12.1
Refrigerant
Charge
Refrigerant Type
Without Reheat
Option
Circuit 1
Circuit 2
With Reheat
Option
Circuit 1
Circuit 2
Gas Heating Options Available
Compressor Type (number) Two-Stage Scroll (1)
Single-Stage Scroll (1)
Outdoor Coils Net face area (total) - sq. ft.
Number of rows 1 1 1 1
23 23 23 23
Outdoor
Coil Fans
2 (1/3) 2 (1/3) 2 (1/2) 2 (1/2)
Motor rpm
Total Motor watts
Diameter - (No.) in. (2) 24 (2) 24 (2) 24 (2) 24
Number of blades 3 3 3 3
Total Air volume - cfm
Indoor
Coil
Net face area (total) - sq. ft.
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 4 4 4 4
14 14 14 14
Drain connection - Number and size (1) 1 in. NPT coupling
Expansion device type Balanced Port Thermostatic Expansion Valve
(removable element head)
Indoor
Blower
Nominal motor output
Blower wheel nominal diameter x width - in. (1) 22 x 9 (1) 22 x 9 (1) 22 x 9 (1) 22 x 9
Filters
Number and size - in.
Electrical characteristics
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
1
Page 6
SPECIFICATIONS VAV MODELS
General Data Nominal Tonnage 7.5 Ton 8.5 Ton 10 Ton 12.5 Ton
High High High High
Model Number LGT092H4P LGT102H4P LGT120H4P LGT150H4P
Blower Type DirectPlus™
ECM Direct Drive
with VAV
DirectPlus™
ECM Direct Drive
with VAV
DirectPlus™
ECM Direct Drive
with VAV
DirectPlus™
ECM Direct Drive
with VAV
Cooling
Performance
Gross Cooling Capacity - Btuh
1Net Cooling Capacity - Btuh
1
Total Unit Power - kW 8.1
1IEER (Btuh/Watt) 14.6 14.6 14.6
1EER (Btuh/Watt) 12.3 12.1 12.1
Refrigerant
Charge
Refrigerant Type
Without Reheat
Option
Circuit 1
Circuit 2
Gas Heating Options Available
Compressor Type (number) Two-Stage Scroll (1)
Single-Stage Scroll (1)
Outdoor Coils Net face area (total) - sq. ft.
Number of rows 1 1 1 1
23 23 23 23
Outdoor
Coil Fans
2 (1/3) 2 (1/3) 2 (1/2) 2 (1/2)
Motor rpm
Total Motor watts
Diameter - (No.) in. (2) 24 (2) 24 (2) 24 (2) 24
Number of blades 3 3 3 3
Total Air volume - cfm
Indoor
Coil
Net face area (total) - sq. ft.
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 4 4 4 4
14 14 14 14
Drain connection - Number and size (1) 1 in. NPT coupling
Expansion device type Balanced Port Thermostatic Expansion Valve
(removable element head)
Indoor
Blower
Nominal motor output
Blower wheel nominal diameter x width - in. (1) 22 x 9 (1) 22 x 9 (1) 22 x 9 (1) 22 x 9
Filters Disposable
Number and size - in.
Electrical characteristics
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
1
SPECIFICATIONS GAS HEAT
Heat Input Type Standard Medium High
Number of Gas Heat Stages 2 2 2
Performance
Input - Btuh
Second Stage
Output - Btuh Second Stage
Minimum Air Volume - cfm
Gas Supply Connections 3/4 in. NPT 3/4 in. NPT 3/4 in. NPT.
Recommended Gas Supply Pressure - Nat. / LPG
Gas Supply Pressure Range
Min./Max. (LPG)
HIGH ALTITUDE DERATE
NOTE - Units may be installed at altitudes up to 2000 feet above sea level without any modications.
At altitudes above 2000 feet units must be derated to match gas manifold pressures shown in table below.
At altitudes above 4500 feet unit must be derated 2% (130K through 180K) and 4% (240K) for each 1000 feet
above sea level.
NOTE - This is the only permissible derate for these units.
Refer to the Installation Instructions for more detailed information.
Heat Input Type Altitude Feet
Gas Manifold Pressure
in. w.g. Input Rate (Btuh)
Natural Gas LPG/ Propane
Standard (2 stage) 1.6 / 3.4
Medium (2 stage) 1.6 / 3.4
1.6 / 3.4
Page 8
BLOWER DATA
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY (NO HEAT SECTION) WITH DRY INDOOR COIL AND AIR
FILTERS IN PLACE.
See page 9for wet coil and option/accessory air resistance data.
Maximum Static Pressure With Gas Heat - 2.0 in. w.g.
Total
Air Volume
cfm
Total Static Pressure - in. w.g.
0.2 0.4 0.6 0.8 1.0 1.2 1.4
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
223 864 298 961 1128 1199
846 943 488 1189 1313
391 1111 1184
366 688 1368 1426
1113 1182 1248 1432 1491 1129
1261 1324 922 1444 1146
1282 1346 1464 1629
821 1432 1489 1192 1494 1663
1461 949 1221 1624
1413 1916
1298 1831 1966 2139 1923
1818 1864
1811 1946 2423
1941 2144 2314 2644 2114
1983 2111 2699 - - - - - -
2428 2112 2194 2912 - - - - - - - - - - - - - - - - - -
2643 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Total
Air Volume
cfm
Total Static Pressure - in. w.g.
1.6 1.8 2.0 2.2 2.4 2.6
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1316 1432 963 1491
1368 894 982 1483 1196 1322
1423 1216 1344 1483 1629
1483 1236 1368 1648
1394 1846
1612 1664 1893 1864 2213
1623 1949 1828 2269 2426
1844 1893 2324 1942 1991 2633
1819 1866 2214 1914 1963 2684
1893 2423 1988 2891 2134
1969 2634 2111 - - - - - -
2689 2844 2998 - - - - - - - - - - - -
2124 - - - - - - - - - - - - - - - - - - - - - - - -
3111 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Page 9
POWER EXHAUST FAN PERFORMANCE
Return Air System Static Pressure Air Volume Exhausted
in. w.g. cfm
BLOWER DATA
FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g.
Air
Volume
cfm
Wet Indoor Coil
Gas Heat Exchanger
Economizer
Humiditrol®
Reheat
Coil
Filters Return
Air
Adaptor
Plate
Standard
Heat
Medium
Heat
High
Heat MERV 8 MERV 13 MERV 16
092, 102 120, 150
CEILING DIFFUSERS AIR RESISTANCE - in. w.g.
FD11 Flush
Unit Size Air Volume
cfm 2 Ends Open 1 Side, 2 Ends
Open
All Ends & Sides
Open
CEILING DIFFUSER AIR THROW DATA
Model No. Air Volume
1
RTD11 Step-Down FD11 Flush
cfm ft. ft.
24 - 29 19 - 24
21 - 29
22 - 29
Models
22 - 29
24 - 33
34 - 42
39 - 49
29 - 38
1
BLOWER DATA
Page 11
ELECTRICAL DATA 8.5 TON
Model No. LGT102H4E / LGT102H4P
1Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor 1
(Non-Inverter)
Rated Load Amps 12.9 4.6
Locked Rotor Amps 62 39
Compressor 2
(Non-Inverter)
Rated Load Amps 6.1 4.8
Locked Rotor Amps 83.1 43 33
Motors (2)
2.4 1.3 1
Total 4.8 2.6 2
Power Exhaust
2.4 1.3 1
Indoor Blower
Motor
4.1
2Maximum
Overcurrent
Protection (MOCP)
Unit Only
Power Exhaust
3Minimum
Circuit
Ampacity (MCA)
Unit Only 44 23
Power Exhaust
46 24 18
1
2
3
ELECTRICAL DATA 7.5 TON
Model No. LGT092H4E / LGT092H4P
1Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor 1
(Non-Inverter)
Rated Load Amps 12.9 4.6
Locked Rotor Amps 62 39
Compressor 2
(Non-Inverter)
Rated Load Amps 13.1 6.1 4.4
Locked Rotor Amps 83.1 41 33
Motors (2)
2.4 1.3 1
Total 4.8 2.6 2
Power Exhaust
2.4 1.3 1
Indoor Blower
Motor
4.1
2Maximum
Overcurrent
Protection (MOCP)
Unit Only
Power Exhaust
3Minimum
Circuit
Ampacity (MCA)
Unit Only 43 23
Power Exhaust
46 24 18
1
2
3
Page 12
ELECTRICAL DATA 10 TON
Model No. LGT120H4E / LGT120H4P
1Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor 1
(Non-Inverter)
Rated Load Amps
Locked Rotor Amps
Compressor 2
(Non-Inverter)
Rated Load Amps 16
Locked Rotor Amps 38.9
Motors (2)
3 1.2
Total 6 3 2.4
Power Exhaust
2.4 1.3 1
Indoor Blower
Motor
4.1
2Maximum
Overcurrent
Protection (MOCP)
Unit Only
Power Exhaust
3Minimum
Circuit
Ampacity (MCA)
Unit Only
Power Exhaust
26 21
1
2
3
ELECTRICAL DATA 12.5 TON
Model No. LGT150H4E/ LGT150H4P
1Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph
Compressor 1
(Non-Inverter)
Rated Load Amps 6.3
Locked Rotor Amps 136 66.1
Compressor 2
(Non-Inverter)
Rated Load Amps 22.6
Locked Rotor Amps 166.2
Motors (2)
3 1.2
Total 6 3 2.4
Power Exhaust
2.4 1.3 1
Indoor Blower
Motor
4.1
2Maximum
Overcurrent
Protection (MOCP)
Unit Only
Power Exhaust
3Minimum
Circuit
Ampacity (MCA)
Unit Only 61 29 23
Power Exhaust
63 24
1
2
3
Page 13
UNIT
CONTROLLER
EVAPORATOR
COIL
CONDENSER
FANS
CONDENSER
COIL
COMPRESSORS CONDENSATE
DRAIN
FILTERS
(FOUR - 20 X 25 X 2”)
ECONOMIZER
(OPTIONAL)
BLOWER
(DIRECT DRIVE)
GAS VALVE
BURNERS
COMBUSTION
AIR INDUCER
IGNITION
CONTROL
REHEAT COIL
(OPTIONAL)
WIRELESS
BOARD
WIFI
ANTENNA
PARTS ARRANGEMENT
FIGURE 1
CONTROL BOX PARTS ARRANGEMENT
W4
A55
K65
K10
K68
T3
TB13
K1
K2
C1 C2
S117
T1
T43
FIGURE 2
Page 14
I-UNIT COMPONENTS
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
electronic components. Take precautions
to neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
A-Control Box Components
control box is located in the upper portion of the compres-
sor compartment.
1-Disconnect Switch S48 (Optional)
All units may be equipped with an optional disconnect
-
cian to disconnect power to the unit.
2-Control Transformer T43 (Re-Heat Units)
T43 is a single line voltage to 24VAC and ties into T1.
See unit diagram. T43 is mounted in the control box. The
transformer supplies power to control circuits (through
single primary voltage tap.
3-Control Transformer T1
All use a single line voltage to 24VAC transformer mount-
ed in the control box. Transformer supplies power to con-
trol circuits in the unit. The transformer is rated at 92VA
and is protected by a 6 amp circuit breaker (CB8). The
-
age transformers use a single primary voltage tap.
BLUE YELLOW
ORANGE
RED
BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
208/230V TRANSFORMER
FIGURE 3
4-Outdoor Fan Relay K10, K68
5-Outdoor Fan Capacitors C1, C2
with unit tonnage and voltage.
6-C. A. I. Transformers T3 575V Units
blower motor (B6).
7-Compressor Contactor K1, K2
contactors with 24VAC coils. K1 and K2 (both energized
8-Burner Controls A3
A3 controls gas heat section burner controls. Burner con-
trols are factory set and are not adjustable. The control
makes three attempts at ignition and then locks out the
system if ignition is not obtained after the third trial. Reset
after lockout requires only breaking and remaking thermo-
in the event of a gas or power failure. Upon restoration
-
9-Power Exhaust Relay K65 (PED units)
10-Unit Controller A55
-
to the Unit Controller guide provided with the unit. Ther-
11-Terminal Block TB13
TB13 terminal block distributes line voltage power to the
line voltage items in the unit.
12-Wireless Antenna
Wireless antenna is located above the return air com-
shows cable routing. Please follow the CORE Controller
setup guide included in the unit.
Antenna
Smoke Detector
Antenna Location
Return Air Section
FIGURE 4
Cable Routing
WIRELESS CONTROL
()BOARD W4
ANTENNA CABLE
ROUTING
FIGURE 5
Page 16
Temperature Sensors
The return air (RT16) and discharge air (RT6) duct probes
The resistance vs. temperature table is shown below:
Relative Humidity Sensor - Optional
The indoor relative humidity sensor (A91) is an analog
with 24VAC.
Enthalpy Sensor - Optional
The sensor is powered with 18VAC provided by M3 unit
control.
-
1.2” water column if not an error code is stored and ser-
vice alarm output is turned on.
TABLE 1
Resistance vs. Temperature
Room Sensors
Room sensor (A2) is a two-wire thermistor with 1k series resistor.
TABLE 2
Two-Wire Thermistor
Carbon Dioxide Sensor
ppm as shown in the following table. The sensor is powered with 24VAC.
TABLE 3
Carbon Dioxide Range
Carbon Dioxide
PPM
DC Voltage Carbon Dioxide
PPM
DC Voltage Carbon Dioxide
PPM
DC Voltage Carbon Dioxide
PPM
DC Voltage
3 6 9
1 4
2 8
VAV Supply Static Sensor
TABLE 4
Carbon Dioxide Range
Pressure “w.c. DC Voltage Pressure “w.c. DC Voltage Pressure “w.c. DC Voltage Pressure “w.c. DC Voltage
336 9
1 2 4
1 2 4 8
PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL
Low Pressure Switch
S87
Low Pressure Switch
S88
High Pressure
Switch
S4
High Pressure
Switch
S7
Evaporator Coil
Compressor
B1
Compressor
B2
Discharge Line
Stage 1
Discharge Line
Stage 2
Suction Line
Stage 1
Suction Line
Stage 2
FIGURE 6
B-Cooling Components
ECM direct drive blowers which draw air across the evap-
orator during unit operation.
On all units the evaporators are slab type and are row split.
Each evaporator uses a thermostatic expansion valve as
the primary expansion device.
-
ditional protection is provided by by thermistors for low
ambient control and freezing prevention.
-
stalled economizer.
1-Compressors B1, B2
Units are equipped with two scroll compressors and two
is single stage compressor. Compressor capacity may
compressor is added to reach the total capacity of the unit.
-
ble of contents) or compressor nameplate for compressor
WARNING
Electrical shock hazard. Compressor must be
grounded. Do not operate without protective
coverover terminals. Disconnect power before
removing protective cover. Discharge capacitors
before servicing unit. Failure to follow these
precautions could cause electrical shock resulting
in injury or death.
Page 18
Each compressor is energized by a corresponding com-
pressor contactor.
operation. If Interlink compressor replacement is neces-
IMPORTANT
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction
pressure goes below 20 psig. A hissing sound
will be heard when the compressor is running
unloaded. Protector will reset when low pressure
in system rises above 40 psig. DO NOT REPLACE
COMPRESSOR.
2-Crankcase Heaters HR1, HR2
-
around compressor B2. Crankcase heater wattage varies
by compressor size.
3-High Pressure Switches S4, S7
The high pressure switch is an auto-reset SPST N.C.
switch which opens on a pressure rise. All units are
switch is located in the compressor discharge line. On al-
line in the blower section. Switches are wired in series
with the compressor contactor coil.
only S4 is used. S4 is located on the common compressor
discharge line and is wired to both compressor contactors
opens and the respective compressor is de-energized (the
economizer can continue to operate). When discharge
pressure switch will close.
locking out. This means the control allows three high pres-
sure trips per one thermostat demand. The control can be
reset by breaking and remaking the thermostat demand or
manually resetting the control.
4-Filter Drier
each refrigerant circuit. The drier removes contaminants
and moisture from the system.
5-Low Pressure Switches S87, S88
The low pressure switch is an auto-reset SPST N.O.
switch (held N.C. by refrigerant pressure) which opens on
a pressure drop. All units are equipped with this switch.
(compressor one) and S88 (compressor two) are wired to
-
es by shunting the switches during start up until pressure
compressor is locked out. The control is reset by breaking
and remaking the thermostat demand or manually reset-
ting the control.
+
compressor( s) is(are) de-energized. The switch automat-
+
-
erant being added.
6-Condenser Fans B4 and B5
condenser fans have single-phase motors. The fan as-
sembly may be removed for servicing and cleaning.
7-Temperature Sensors RT46, RT47, RT48 & RT49
Units are equipped with four factory-installed thermistors
-
ant circuit.
The thermistors provide the Unit Controller with constant
-
frigeration circuit. These temperatures are used as feed-
back in certain modes of unit operation.
Page 19
BLUE
RT47
YELLOW
RT46
22J06
22J06
THERMISTOR LOCATION - EVAPORATOR COIL
RT46, RT47
FIGURE 7
THERMISTOR LOCATION - CONDENSER COIL
RT48, RT49
DETAILS NOT TO SCALE
BLUE
RT49
YELLOW
RT48
23V50
23V50
FIGURE 8
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12
Table of contents
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