Lennox ELITE 12GCS Series Unit Information

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User's information manual (4 pages)

User's information manual (4 pages)

Installation instructions manual (16 pages)

Service Literature

The 12GCS packaged heat/cool units, are available in sizes

ranging from 2 through 5 tons (7.0 through 17.6 kW). 12GCS

series units are designed for outdoor residential use only.

Units can be installed at ground level or roof top applications.

Gas heat sections are available with Lennox S−curve heat ex-

changers in 50,000, 75,000, 100,000 and 125,000 Btuh input

sizes.

The 12CHP packaged heat pump units are available in

sizes ranging from 2 through 5 tons (7.0 through 17.6 kW).

12CHP units are designed for outdoor residential use only.

Units can be installed at ground level or rooftop applica-

tions. Optional field installed supplemental electric heat is

available in 5, 7, 10, 15 and 20 kW.

Both the 12GCS and 12CHP units utilize a scroll compres-

sor. It operates much like a standard compressor, but the

scroll compressor is unique in the way that it compresses

refrigerant. The compressor has overload protection and its

own cover for reducing operating sound levels.

Information contained in this manual is intended for use by

qualified service technicians only. All specifications are sub-

ject to change. Procedures outlined in this manual are pre-

sented as a recommendation only and do not supersede or

replace local or state codes.

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, person-

al injury or loss of life. Installation and service must

be performed by a qualified installer or service

agency.

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CAUTION

Electrostatic discharge can affect electronic

components. Take precautions during unit instal-

lation and service to protect the unit's electronic

controls. Precautions will help to avoid control

exposure to electrostatic discharge by putting

the unit, the control and the technician at the

same electrostatic potential. Neutralize electro-

static charge by touching hand and all tools on an

unpainted unit surface before performing any

service procedure.

Corp. 0003−L3

Revised 06−2004

12GCS/12CHP ELITE SERIES UNITS

Page 1

12GCS/12CHP

2 to 5 Ton (7.0 to 17.6 kW)

12GCS

12CHP

Introduction....................................................................1

Specifications/Blower Data 12GCS.............................2,4

High Altitude 12GCS.......................................................4

Specifications/Blower Data 12CHP.............................5,6

Parts Arrangement......................................................7,8

I Application ...................................................................9

II Unit Components ...................................................9,14

III Electric Heat .........................................................15,17

IV Charging ..............................................................18,19

V Maintenance ........................................................... 20

VII Wiring Diagram and Sequence of Operation .......... 21

Litho U.S.A.

Table of Contents

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Summary of Contents for Lennox ELITE 12GCS Series

Page 1: Table Of Contents
Units can be installed at ground level or roof top applications. Gas heat sections are available with Lennox S−curve heat ex- changers in 50,000, 75,000, 100,000 and 125,000 Btuh input sizes.
Page 2 SPECIFICATIONS 12GCS 12GCS024-50 12GCS24-75 12GCS030-50 12GCS030-75 12GCS036-50 12GCS036-75 12GCS036-100 Model No. 12GCSX024-50 12GCSX024-75 12GCSX030-50 12GCSX030-75 12GCSX036-50 12GCSX036-75 12GCSX036-100 Heating capacity input− Btuh (kW) 50,000 (14.7) 75,000 (22.0) 50,000 (14.7) 75,000 (22.0) 50,000 (14.7) 75,000 (22.0) 100,000 (29.3) Heating capacity output− Btuh (kW) 40,000 (11.7) 60,000 (17.6) 40,000 (11.7)
Page 3 SPECIFICATIONS 12GCS 12GCS042-75 12GCS042-100 12GCS048-100 12GCS048-125 12GCS060-100 12GCS060-125 Model No. 12GCSX042-75 12GCSX042-100 12GCSX048-100 12GCSX048-125 12GCSX060-100 12GCSX060-125 Heating capacity input− Btuh (kW) 75,000 (22.0) 100,000 (29.3) 100,000 (29.3) 125,000 (36.6) 100,000 (29.3) 125,000 (36.6) Heating capacity output− Btuh (kW) 60,000 (17.6) 80,000 (23.4) 80,000 (23.4) 100,000 (29.3)
Page 4: Specifications/Blower Data 12Gcs
ELECTRICAL 12GCS Model No. 12GCS024 12GCS030 12GCS036 12GCS042 12GCS048 12GCS060 Line voltage data − 60hz 1 phase 208/230v Recommended maximum fuse size or circuit breaker size (amps) Minimum Circuit Ampacity 17.3 21.6 24.9 29.4 35.4 37.4 Rated load amps 10.9 13.6 16.2 19.2...
Page 5 SPECIFICATIONS 12CHP Model No. 12CHP024 12CHP030 12CHP036 12CHP042 12CHP048 12CHP060 Cooling Capacity Btuh (kW) 23,800 (7.0) 28,000 (8.2) 35,000 (10.2) 42,000 (12.3) 48,000 (14.0) 57,000 (16.7) ARI Total unit watts 2160 2550 3210 3930 4510 5230 Cooling Cooling SEER (Btuh/Watts) 12.00 12.00 12.00...
Page 6: Specifications/Blower Data 12Chp
BLOWER DATA 12CHP 12CHP024 BLOWER PERFORMANCE 12CHP036 AND 12CHP042 BLOWER PERFORMANCE Horizontal Air Flow Horizontal Air Flow Air Volume at Various Blower Speeds Air Volume at Various Blower Speeds External Static External Static External Static External Static Pressure Pressure High Medium High Medium...
Page 7: Parts Arrangement
12GCS PARTS ARRANGEMENT CONDENSER FAN CONDENSER COIL BLOWER MOTOR SCROLL COMPRESSOR COMBUSTION AIR HEAT EXCHANGER PROVE SWITCH ASSEMBLY MANIFOLD GAS VALVE COMBUSTION AIR INDUCER FIGURE 1 12CHP PARTS ARRANGEMENT DEFROST CONTROL CAPACITOR OUTDOOR FAN OUTDOOR COIL SCROLL COMPRESSOR REVERSING VALVE FIGURE 2 Page 7...
Page 8 12GCS CONTROL BOX IGNITION/BLOWER CONTROL CONTACTOR TRANSFORMER (A3) (K1) (T1) DUAL/FAN CAPACITOR (C12) FIGURE 3 12CHP CONTROL BOX DEFROST CONTROL TRANSFORMER BLOWER CONTROL CONTACTOR (CMCI) (T1) (A15) (K1) DUAL / FAN CAPACITOR (C12) FIGURE 4 Page 8...
Page 9: I Application
I−APPLICATION 4−Ignition/Blower Control A3 (GCS only) 12GCS 2 through 5 ton (7.0 through 17.6kW) model units All 12GCS series units are equipped with an integrated ignition are single packaged heat/cool units designed for outdoor / blower board (A3) which controls ignition, safety circuits, installation on a slab or rooftop.The units are available in blower operation and fan off timing.
Page 10 Blower Operation / Fan Off Time 6−Defrost Control CMCI (CHP Only) Fan off timing (time that the blower operates after the heat /cool If outdoor ambient conditions are such that frost forms on demand is satisfied) is factory set at 120 seconds for heat and the outdoor coil, the defrost control monitors the need for 90 seconds for cool.
Page 11 See figure 9 . Rollout switch S47 is a high temperature limit located on the An LP changeover kit (Lennox part #42K91) is available. The burner box. The switch is a N.C. manual reset switch con- kit includes burner orifices and a regulator conversion kit. Fol- nected in series with limit S10 and ignition control A3.
Page 12 7−Clamshell Heat Exchanger 9−Electrode/Flame Sensor The 12GCS units use an aluminized steel tapered S−curve The electrode/sensor is used for ignition and is located in the heat exchanger. Heat is transferred to the air stream from all left hand mounting hole. 12GCS −1 models will have a single surfaces of the heat exchanger.
Page 13 TABLE 3 12CHP060 with Variable Speed Motor Mode of Ramp Ramp Ramp Ramp Common Common Operation down down After 7.5 25 Sec 2 Sec 90 Sec Motor Plug in Pin 1 Pin 2 Pin 3 Pin 5 Pin 9 Pin 10 Pin 11 Pin 12 Pin 14...
Page 14 The scroll is a simple compression concept centered scroll and is discharged. If the compressor is replaced, con- around the unique spiral shape of the scroll and its inherent ventional Lennox cleanup practices must be used. properties. Two identical scrolls are mated together form- 2−Condenser Fan ing concentric spiral shapes (figure 13).
Page 15: Electric Heat
3−Reversing Valve L1 (CHP only) ECH26 VESTIBULE PARTS ARRANGEMENT (ECH26−20 SHOWN) Reversing valve L1 has a 24 volt solenoid coil which re- verses refrigerant flow during unit operation in all ELECTRIC HEAT THERMAL ELEMENT 12CHP units. The reversing valve is in the refrigerant circuit FUSE vapor line.The reversing valve coil is energized during cooling demand and during defrost.
Page 16 6−Circuit Breaker CB1 and CB2 TABLE 4 ECH26−15, −20, ECH29 Circuit Breakers UNIT CB1 AMPS CB2 AMPS Line voltage connections are made to circuit breakers CB1 and ECH29−15−1−P 60 AMPS 30 AMPS CB2 in electric heat sections with circuit breakers. Table 4 ECH29−20−1−P 60 AMPS 60 AMPS...
Page 17: Charging
IV−Charging could mean that the system is not properly charged or that a problem exists with some component in the system. Used carefully, this table could serve as a useful service guide. WARNING Table 7 should be used when unit is charged during the heating mode.
Page 18 B−12GCS Verify system performance using table 10 as a general guide. Table should not be used for charging unit. Minor For maximum performance of this cooling system, the variations in these pressures may be expected due to differ- operating temperatures and pressure should be checked ences in installations.
Page 19: Maintenance
V−Maintenance CLEANING FLUE PASSAGES & HEATING ELEMENTS With proper combustion adjustment the heat exchanger of Periodic inspection and maintenance normally consists of a gas fired furnace will seldom need cleaning. If the heat ex- changing or cleaning filters and (under some conditions) changer should become sooted, it can be cleaned as fol- cleaning the coils.
Page 20: Wiring Diagram And Sequence Of Operation
VI−Wiring Diagram and Sequence of Operation A−12GCS−024/060−1−P Cooling Heating 1− Heating demand initiates at "W1" in the indoor thermo- 1− Cooling demand initiates at Y1 in the indoor thermo- stat. stat. 2− Assuming all safety circuits are closed, A3 energizes 2−...
Page 21 B−12GCS−024/060−2−P Cooling Heating 1− Heating demand initiates at "W1" in the indoor thermo- 1− Cooling demand initiates at Y1 in the indoor thermo- stat. stat. 2− Assuming all safety circuits are closed, A3 energizes 2− 24VAC from Y1 energizes time delay DL8, which ener- the combustion air inducer blower B6.
Page 22 C−12CHP−024/048 Cooling First Stage Heat 9− Heating demand initiates at "Y1" in the thermostat. 1− Internal thermostat wiring energizes terminal "O" by 10− 24VAC energizes compressor contactor cooling mode selection, energizing reversing valve L1. (12CHP048 only, Y1 energizes time delay DL8, which 2−...
Page 23 D−12CHP060−1−P Cooling First Stage Heat 9− Heating demand initiates at "Y1" in the thermostat. 1− Internal thermostat wiring energizes terminal "O" by 10− 24VAC energizes compressor contactor K1. cooling mode selection, energizing reversing valve L1. 11− K1−1 and K1−2 close, energizing compressor B1 and 2−...
Page 24 E−ECH29−1−P (ECH29−20 Shown ) First Stage Heat Second Stage Heat 3− W2 energizes electric heat relay K33 through P2−6. 1− When there is a call for heat, Y1 energizes electric heat relay K32 through P2−3. 4− K33−1 closes energizing K34. 5−...

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Lennox ELITE 12GCS Series Unit Information

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