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356485-UIM-E-0210

12

Johnson Controls Unitary Products

SECTION V: ELECTRICAL POWER

ELECTRICAL POWER CONNECTIONS

Field wiring to the unit must be grounded. Electric wires that are field
installed shall conform to the temperature limitation for 63°F (35°C) rise
wire when installed in accordance with instructions. Refer to Table 6 in
these instructions for specific furnace electrical data.

Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.
The furnace shall be installed so that the electrical components are protected from water.

SUPPLY VOLTAGE CONNECTIONS

1.

Provide a power supply separate from all other circuits. Install
overcurrent protection and disconnect switch per local/national
electrical codes. The switch should be close to the unit for conve-
nience in servicing. With the disconnect or fused switch in the OFF
position, check all wiring against the unit wiring label. Refer to the
wiring diagram in this instruction.

2.

Remove the screws retaining the wiring box cover. Route the
power wiring through the opening in the unit into the junction box
with a conduit connector or other proper connection. In the junc-
tion box there will be 3 wires, a Black Wire, a White Wire. Connect
the power supply as shown on the unit-wiring label on the inside of
the blower compartment door or the wiring schematic in this sec-
tion. The black furnace lead must be connected to the L1 (hot)
wire from the power supply. The white furnace screw must be con-
nected to neutral. Connect the power supply ground to the green
screw (equipment ground) An alternate wiring method is to use a
field provided 2” (5.1 cm) x 4” (10.2 cm) box and cover on the out-
side of the furnace. Route the furnace leads into the box using a
protective bushing where the wires pass through the furnace
panel. After making the wiring connections replace the wiring box
cover and screws. Refer to Figure 16.

3.

The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 16

LOW VOLTAGE CONTROL WIRING CONNECTIONS

Install the field-supplied thermostat by following the instructions that
come with the thermostat. With the thermostat set in the OFF position
and the main electrical source disconnected, connect the thermostat
wiring from the wiring connections on the thermostat to the terminal
board on the ignition module, as shown in Figures 17 or 18. Electronic
thermostats may require the common wire to be connected. Apply
strain relief to thermostat wires passing through cabinet. If air condition-
ing equipment is installed, use thermostat wiring to connect the Y and C
terminals on the furnace control board to the proper wires on the con-
densing unit (unit outside). 

The 24-volt, 40 VA transformer is sized for the furnace components
only, and should not be connected to power auxiliary devices such as
humidifiers, air cleaners, etc. The transformer may provide power for an
air conditioning unit contactor.

Use copper conductors only.

Table 6: 

Ratings & Physical / Electrical Data

Input

Output

Nominal

Airflow

AFUE

Air Temp. 

Rise

Max. Outlet

Air Temp

Blower

Blower 

Size

Max 

Over-Current 

Protect

Total Unit

Amps

Min. wire Size 

(awg) @ 75 ft 

one way

MBH

kW

MBH

kW

CFM

m

3

/min

°F

°C

°F

°C

HP

Amps

40

11.7

32

9.4

800

22.7

80.0

25-55

14-31

155

68.3

1/5

2.1

9 x 8

10

4.5

14

60

17.6

48

14.1

1000

28.3

80.0

25-55

14-31

155

68.3

1/3

3.8

9 x 8

10

6.0

14

60

17.6

48

14.1

1200

34.0

80.0

30-60

17-33

170

76.7

1/3

4.8

11 x 8

10

7.0

14

80

23.5

64

18.8

1200

34.0

80.0

35-65

19-36

165

73.9

1/3

4.8

11 x 8

10

7.5

14

80

23.5

64

18.8

1600

45.3

80.0

25-55

14-31

155

68.3

1/2

7.5

11 x 10

15

10.0

14

80

23.5

64

18.8

2200

62.3

80.0

25-55

14-31

155

68.3

1

14.5

11 x 11

20

16.0

12

100

29.3

80

23.4

1200

34.0

80.0

40-70

22-39

170

76.7

1/3

4.8

9 x 8

10

7.5

14

100

29.3

80

23.4

1600

45.3

80.0

35-65

19-36

165

73.9

1/2

7.5

11 x 10

15

10.0

14

100

29.3

80

23.4

2000

56.6

80.0

25-55

14-31

155

68.3

1

14.5

11 x 11

20

17.0

12

120

33.7

96

26.9

1600

45.3

80.0

40-70

22-39

170

76.7

1/2

7.5

11 x 10

15

10.0

14

120

33.7

96

26.9

2000

56.6

80.0

30-60

17-33

160

71.1

1

14.5

11 x 11

20

17.0

12

130

38.1

104

30.5

2000

56.6

80.0

35-65

19-36

165

73.9

1

14.5

11 x 11

20

17.0

12

 FIGURE 16:  

Electrical Wiring

Electrical Entry

Junction
Box

L1-Hot

Neutral

Connect ground
lead to screw

BLK

WHT

The power connection leads and wiring box may be relocated to the
left side of the furnace. Remove the screws and cut wire tie holding
excess wiring. Reposition on the left side of the furnace and fasten
using holes provided.

Set the heat anticipator in the room thermostat to 0.4 amps. Setting
it lower will cause short cycles. Setting it higher will cause the room
temperature to exceed the set points.

Some electronic thermostats do not have adjustable heat anticipa-
tors. They should be set to six cycles per hour. Follow the thermo-
stat manufacturer's instructions.

Summary of Contents for GG8S*MP series

Page 1: ...Pressure 22 Blower Performance CFM Any Position without filter Bottom Return 24 Blower Performance CFM Any Position without filter Left Side Return 25 These high efficiency compact units employ induced combustion reli able hot surface ignition and high heat transfer aluminized tubular heat exchangers The units are factory shipped for installation in upflow or horizontal applications and may be con...

Page 2: ...abinet support the ends of the furnace rather than lifting by the cabinet flanges at the return air openings bottom or sides or supply air opening 13 When lifting the furnace it is acceptable to use the primary heat exchanger tubes as a lifting point provided that the tubes are lifted at the front of the heat exchangers where attached to the vestibule panel Do not use the top return bend of the he...

Page 3: ... the National Fire Protection Association Inc Batterymarch Park Quincy MA 02269 or for only the NFGC contact the American Gas Association 400 N Capital N W Washington DC 20001 or www NFPA org CANADA NSCNGPIC For a copy contact Standard Sales CSA International 178 Rexdale Boulevard Etobicoke Toronto Ontario Canada M9W 1RS STEP 3 Combustion and Ventilation Air US Section 5 3 of the NFGC air for Comb...

Page 4: ...monoxide detector with an alarm and battery back up is installed on the floor level where the gas equipment is to be installed In addition the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling building or structure served by the side wall horizontal vented gas fueled equip...

Page 5: ...ccess cover shall be attached in such a manner as to prevent leaks DUCT FLANGES Four flanges are provided to attach ductwork to the furnace These flanges are rotated down for shipment In order to use the flanges remove the screw holding an individual flange rotate the flange so it is in the upward position and reinstall the screw then repeat this for all 4 flanges If the flanges are not used they ...

Page 6: ...ould always be installed on the side desig nated as top side See Figures 4 5 FURNACE ASSEMBLY PC SERIES COILS These upflow coils are designed for installation on top of upflow fur naces only If the coil is used with a furnace of a different size use a 45 transition to allow proper air distribution through the coil 1 Position the coil casing over the furnace opening as shown in Fig ure 6 2 Place th...

Page 7: ...he unit BOTTOM RETURN AND ATTIC INSTALLATIONS Bottom return applications normally pull return air through a base plat form or return air plenum Be sure the return platform structure or return air plenum is suitable to support the weight of the furnace The internal bottom panel must be removed for this application Attic installations must meet all minimum clearances to combustibles and have floor s...

Page 8: ...6 15 2 cm minimum clearance between the front of the furnace and the support rods or straps All six suspension points must be level to ensure proper and quiet fur nace operation When suspending the furnace use a secure platform constructed of plywood or other building materials secured to the floor or ceiling joists Refer to Figure 11 for details and additional information When moving or handling ...

Page 9: ...FM m3 min Cabinet Size Cabinet Dimensions Inches Approximate Operating Weights A A cm B B cm C C cm Lbs 40 11 7 800 22 7 A 14 1 2 36 8 13 3 8 34 0 10 3 26 2 89 60 17 6 1000 28 3 A 14 1 2 36 8 13 3 8 34 0 10 3 26 2 91 60 17 6 1200 34 0 A 14 1 2 36 8 13 3 8 34 0 10 3 26 2 94 80 23 4 1200 34 0 B 17 1 2 44 4 16 3 8 41 6 11 8 29 9 103 80 23 4 1600 45 3 C 21 53 3 19 7 8 50 5 13 6 34 5 114 80 23 4 2200 6...

Page 10: ...s in this section specify the type of gas approved for this furnace only use those approved gases The instal lation of a drip leg and ground union is required Refer to Figure 15 FIGURE 13 Side Return Cutout Markings Some accessories such as electronic air cleaners and pleated media may require a larger side opening Follow the instructions supplied with that accessory for side opening requirements ...

Page 11: ...ropane LP gas must have the LoNOx screens removed prior to installation and operation See propane instructions Table 5 Nominal Manifold Pressure Manifold Pressures in wc Manifold Pressures kpa Altitude feet Altitude m 0 7999 8000 8999 9000 9999 0 2437 2438 2742 2743 3048 Gas Heating Value BTU cu ft 800 3 5 3 5 3 5 Gas Heating Value MJ cu m 29 8 0 87 0 87 0 87 850 3 5 3 5 3 5 31 7 0 87 0 87 0 87 90...

Page 12: ...nnect the thermostat wiring from the wiring connections on the thermostat to the terminal board on the ignition module as shown in Figures 17 or 18 Electronic thermostats may require the common wire to be connected Apply strain relief to thermostat wires passing through cabinet If air condition ing equipment is installed use thermostat wiring to connect the Y and C terminals on the furnace control...

Page 13: ...pressor G Fan PP11C70224 THERMOSTAT RH 24 Volt Hot Heat XFMR RC 24 Volt Hot Cool XFMR W Full Stage Heat Clipping Jumper W914 for electric heat on thermostat is not necessary 24VAC Humidifier Optional C 24 Volt Common Y Compressor SINGLE STAGE AIR CONDITIONER Y Compressor Contactor SINGLE STAGE AIR CONDITIONER SINGLE STAGE AIR CONDITIONER G8C L Y M 8S G 9F G 8 9 S ID MODELS G T GLS G T G 8 9 S LF8 ...

Page 14: ...LS HGD HP RHS O Reversing Valve Energized in Cool C 24 Volt Common R 24 Volt Hot W1 66 out Heat Y Compressor DEMAND DEFROST CONTROL X L Malfunction Light W Auxiliary Heat SINGLE STAGE HEAT PUMP 1 1 Part Number S1 2HU16700124 3 24VAC Humidifier Optional External Humidistat Optional Open on Humidity Rise 3 Y2 Second Stage Compressor Step 9 of Thermostat Installer Configuration Menu must be set to Pu...

Page 15: ...the furnace that operates on W2 will be supplying cold air in the Heating mode to the occupied spaces unless W2 is energized GAS PIPING Furnace gas supplies must be provided as specified with these instruc tions Since the furnaces are side by side with no space between gas supplies must enter on the right and left respectively All gas piping must be in accordance with the national fuel gas code AN...

Page 16: ...escribed below 2 Connect a wire from the TWIN terminal of Furnace 1 to the TWIN terminal of Furnace 2 3 Install a separate 24V relay as shown in the diagram below Use of this relay is required as it ensures that the transformers of the two furnaces are isolated thus preventing the possibility of any safety devices being bypassed 4 Connect the common between furnace 1 and furnace 2 Single Wire Stag...

Page 17: ...mney must extend at least 5 ft 1 5 m above the highest equipment draft hood or flue collar FAN ASSISTED COMBUSTION SYSTEM This appliance is equipped with an integral mechanical means to either draw products of combustion through the heat exchanger Ambient Combustion Air Supply This type installation will draw the air required for combustion from within the space surrounding the appliance and from ...

Page 18: ...s must be given consideration in calculating free area If the free area of a specific louver or grille is not known Refer to Table 7 to estimate free area Ventilated Combustion Air The ventilated attic space or a crawl space from which the combustion air is taken must comply with the requirements specified in AIR SOURCE FROM OUTDOORS in this instruction or in Section 5 3 Air for Combustion and Ven...

Page 19: ... simply slide the NOx screens out of the heat exchanger tubes and discard the screens 8 Replace all components in reverse order Reconnect all wiring CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monxide poisoning or death The following steps shall be followed for each...

Page 20: ...pilots 2 Run furnace for a minimum of 3 minutes in heating operation 3 Measure time in sec for gas meter to complete 1 revolution and note reading The 2 cubic feet dial provides a more accurate mea surement of gas flow 4 Refer to Table 10 for cubic feet of gas per hour 5 Multiply cubic feet per hour by heating valve BTU cu ft to obtain input If clocked rate does not match the input rate from the u...

Page 21: ...0 22 164 327 818 64 56 112 281 23 157 313 783 66 54 109 273 24 150 300 750 68 53 106 265 25 144 288 720 70 51 103 257 26 138 277 692 72 50 100 250 27 133 267 667 74 48 97 243 28 129 257 643 76 47 95 237 29 124 248 621 78 46 92 231 30 120 240 600 80 45 90 225 31 116 232 581 82 44 88 220 32 113 225 563 84 43 86 214 33 109 218 545 86 42 84 209 34 106 212 529 88 41 82 205 35 103 206 514 90 40 80 200 3...

Page 22: ...e by adjusting gas valve regulator screw for the appropriate gas per the following 4 After the manifold pressure has been adjusted re calculate the furnace input to make sure you have not exceeded the specified input on the rating plate Refer to CALCULATING THE FURNACE INPUT NATURAL GAS 5 Once the correct BTU kW input has been established turn the gas valve to OFF and turn the electrical supply sw...

Page 23: ...s 4 settings 60 90 120 and 180 seconds The fan off delay is factory set to 120 sec onds The fan off setting must be long enough to adequately cool the furnace but not so long that cold air is blown into the heated space The fan off timing may be adjusted by positioning the jumper on two of the four pins as shown in Figure 27 The temperature rise or temperature difference between the return air and...

Page 24: ...2638 2540 2448 2339 2224 2111 1974 1831 Medium High 2234 2233 2147 2092 2042 1974 1907 1820 1705 1575 Medium Low 1722 1716 1690 1681 1603 1553 1489 1426 1335 1241 Low 1396 1375 1348 1325 1263 1200 1150 1120 1052 965 100B12 High 1314 1318 1292 1265 1223 1177 1119 1051 971 890 Medium High 1010 1004 1003 995 992 956 914 857 798 721 Medium Low 812 805 796 786 777 754 727 685 626 560 Low 661 659 644 62...

Page 25: ...Low 1126 1115 1095 1049 1027 996 957 929 840 742 080C22 High 2972 2863 2769 2671 2571 2465 2352 2227 2095 1950 Medium High 2173 2146 2103 2082 2036 1966 1904 1827 1738 1621 Medium Low 1670 1667 1647 1618 1585 1549 1492 1408 1350 1238 Low 1371 1339 1317 1284 1259 1199 1147 1085 1024 928 100B12 High 1258 1278 1283 1259 1240 1204 1149 1073 1015 897 Medium High 986 995 1011 1003 962 935 913 861 808 73...

Page 26: ...e switch will close the ignition control pro vides a 17 second ignitor warm up period the gas valve then opens the gas starts to flow ignition occurs and the flame sensor begins its sensing function The blower motor will energize 30 seconds after the gas valve opens if a flame is detected Normal furnace operation will continue until the thermostat circuit between R and W is opened which causes the...

Page 27: ...nace will lock out for one hour and then restart 8 RED FLASHES This fault is indicated if the flame is lost 5 times 4 recycles during the heating cycle This could be caused by low gas pressure dirty or faulty flame sensor or faulty gas valve The furnace will lock out for one hour and then restart 9 RED FLASHES Indicates reversed line voltage polarity or grounding problem Both heating and cooling o...

Page 28: ... L Models Only MISCELLANEOUS ORIFICE BURNER Natural 45 SIGHT GLASS OVAL 2 Req d GASKET FOAM Door 1 5 ft req d GASKET INTAKE PAN PLUG VENT HOLE BRACKET DOOR WIRING HARNESS FERRULE 3 Req d GROMMET 3 Req d MOTOR MOUNT TUBING SILICON DIAGRAM WIRING KNOB QUARTER TURN 4 Req d DESCRIPTION Continued REPLACEMENT PART CONTACT INFORMATION This is a generic parts list To request a complete parts list refer to...

Page 29: ...356485 UIM E 0210 Johnson Controls Unitary Products 29 SECTION XI WIRING DIAGRAM FIGURE 28 Wiring Diagram ...

Page 30: ...change without notice Published in U S A 356485 UIM E 0210 Copyright 2010 by Johnson Controls Inc All rights reserved Supersedes 356485 UIM D 0708 Johnson Controls Unitary Products 5005 York Drive Norman OK 73069 ...

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