Lennox International Inc G50UH-48C-110 PowER @1HsuN,T, INTERIORMAKE-UP BOX Installation

Page 22

INTERIORMAKE-UP BOX INSTALLATION

MAKE-UP

Left side

/

BOX

_ °

FIGURE 22

Refer to figure 24 for field wiring and figure 26 for schematic wiring diagram and troubleshooting.

1 - Select circuit protection and wire size according to the unit nameplate. The power supply wiring must meet Class I restrictions,

2 - Holes are on both sides of the furnace cabinet to facili- tate wiring,

3 - Install a separate disconnect switch (protected by ei- ther fuse or circuit breaker) near the furnace so that power can be turned off for servicing,

4 - Before connecting the thermostat or the power wiring, check to make sure the wires will be long enough for servicing at a later date, Remove the blower access panel to check the length of the wire,

5- Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wir- ing diagram shown in figure 24, Use 18-gauge wire or larger that is suitable for Class II rating for thermostat connections,

6 - Electrically ground the unit according to local codes or, in the absence of local codes, according to the current National Electric Code (ANSI/NFPA No, 70) for the USA and current Canadian Electric Code part 1 (CSA standard C22.1) for Canada. A green ground wire is provided in the field make-up box,

NOTE - The G5OUH(X) furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

7 - One line voltage "EAC" terminal is provided on the fur- nace control board. Any electronic air cleaner rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to any of the "NEUTRAL" terminals. See figure 25 for control board configuration. This terminal is energized when the blower is operating,

8 - One line voltage "HUM" terminal is provided on the fur- nace control board, A humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to any of the "NEUTRAL" terminals. See figure 25 for control board configura- tion. This terminal is energized in the heating mode whenever the combustion air inducer is operating.

9 - One 24 volt terminal "24V HUM" is provided on the fur- nace control board. A humidifier rated up to 0.5 amp can be connected to this terminal with the common leg

of the circuit being connected to the "C" terminal d the thermostat terminal block located on the control board.

10-Install the room thermostat according to the instruc- tions provided with the thermostat. See figure 23 for thermostat designations. If the furnace is being

matched with a heat pump, refer to the FM21 installa- tion instruction.

G50UH(X) and CONDENSING UNIT

THERMOSTAT DESIGNATIONS

(Refer to specific thermostat and outdoor unit.)

ThermostatG50UH(X)Condensing

FurnaceUnit

PowER

@1HsuN,T

FIGURE 23

Indoor Blower Speeds

1 - When the thermostat is set to "FAN ON," the indoor blower will run continuously on the low speed when there is no cooling or heating demand,

2 - When the G50UH(X)is running in the heating mode, the indoor blower will run on the heating speed.

3 - When there is a cooling demand, the indoor blower will run on the cooling speed,

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Contents G50UHX Series Supply AIR Gasket FlueTransition FlueBoxGasket HeatExchanger FlueCollectorBoxPackage 1 of 1 contains Wheninstalled,thisfurnacemustbeelectricallygrounded Canada,referto the standardCSAB149installation codes AcautionWiTER/ Room Air from InsideMm at unit front. The unit must be level Equipment in Confined Space ALL AIR from Outside27-5/8 Side View Front ViewRemoving the Bottom Panel Leveling Bolt Installation Inches mmRemovingthe Bottom Panel Leveling an Upflow UnitHorizontal Application Unit Installed on Platform Combustion Air Inducer Filter SizeSupply Air Plenum HoleThelatesteditionof NationalFuelGasCodeNFPA54 Venting Using a Masonry ChimneyOutletopeningSeefigure15 Vent ConnectionSingle appliance Common Venting Using Tile-Lined Interior Masonry ChimneCombined Vent Connector Minimum Vent capacityMaximum Horizontal Inches mm MIN MAX Serving a Single Category I Appliance Type B Double-WallVents with Type B Double-Wall Connectors Serving Two or More Category I AppliancesVent Removal of the Furnace from Common VentPropaneInstallationCodesinCanada Gas Pipe Capacity ft3/hr m3/hrLeak Check Precautions and ProceduresInterior MAKE-UP BOX Installation Electrostatic Discharge ESDPowER @1HsuN,T INTERIORMAKE-UP BOX InstallationTypical G50UHX Field Wiring Diagram Zk for Correct Number of SecondaryG5OUHX SotFor Your Safety Read Before Lighting ManifoldHoneywell VR8205 Gas Valve with ON/OFF Switch RevolutionPrimary and Secondary Limits Checkunitforproperdraft FlueAnd ChimneyG50UHX Burner & Heat Exchanger Removal Ak Caution Diagnostic Normal Heating Mode Abnormal Heating Mode Surelight Control=-l YESlNormalcooling Mode Abnormalcooling Mode YESlYEs BlowerMotorAmps FurnaceBtuInput

G50UH-60D-155, G50UH-36B-090, G50UH-36A-070, G50UH-24A-045, G50UH-60D-135 specifications

Lennox International Inc is renowned for its high-quality heating, ventilation, and air conditioning (HVAC) solutions. Among its versatile product lineup are the G50UH series of gas furnaces, which exemplify efficiency and performance. These models, specifically the G50UH-24A-070, G50UH-24A-045, G50UH-36B-090, G50UH-36A-070, and G50UH-48C-135, offer a range of features tailored to meet varying residential heating demands.

One of the key features of the G50UH series is its energy efficiency. Many models in this lineup boast an impressive Annual Fuel Utilization Efficiency (AFUE) rating, which indicates their ability to convert fuel into usable heat efficiently. These high AFUE ratings can lead to significant savings on energy bills, making these furnaces a cost-effective choice for homeowners.

The G50UH series incorporates advanced technology, including multi-speed blowers that enhance comfort levels. This feature allows for better airflow control and can help maintain consistent temperatures throughout the home. The controlled airflow reduces temperature swings and ensures that every room benefits from the heating provided by the furnace.

Safety is paramount in Lennox designs, and the G50UH series is no exception. Each unit is equipped with safety features designed to protect both the furnace and the home. Dual certification ensures that the products meet stringent safety standards. Moreover, features like a self-diagnostic control board streamline maintenance, allowing homeowners to easily identify potential issues.

Another important characteristic of the G50UH series is its compact design, which is beneficial for homes with limited space. The units are designed to fit comfortably in various installation environments, from basements to utility rooms.

Durability is another hallmark of the G50UH furnaces. Constructed with quality materials, these units are designed for long-term reliability. This ensures that homeowners can enjoy the comfort of their heating systems without frequent repairs.

Lastly, Lennox provides extensive support and warranties, giving homeowners peace of mind associated with their purchase. With options tailored to meet diverse home heating needs, the Lennox G50UH series stands out in the HVAC market, combining efficiency, safety, and reliability in one impressive package.
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