LENNOX 506202-02 Enthalpy Sensor Kit Instruction Manual

LENNOX 506202-02 Enthalpy Sensor Kit

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 qualified installer, service agency or the gas supplier

CAUTION
Danger of sharp metallic edges. Can cause injury. Take care when servicing unit to avoid accidental contact with sharp edges.

Shipping and Packing List

Package 1 of 1 contains: 

• 1- Sensor
• 2- #6‐32 X 7/8” Screws
• 1- P104 Wiring harness (used for outdoor air sensing only)
• 1- P105 Wiring harness (used for return air sensing only)
• 1- J105 Wiring harness (used on KG/KC/KH092-300S only)
• 1- Bracket (used on LG/LC/KG/KC/KH 092-150 units only)
• 1- Wire tie
• 1- #10-16 X 5/8” SDST screw

IMPORTANT – Two kits must be installed if differential enthalpy sensing is specified. Check packaging for shipping damage. Contact the last carrier immediately if any shipping damage is found.

Application

Sensors provide input to determine free cooling suitability. The enthalpy sensor provided in this kit senses both sensible temperature and humidity. See table 1 for usage. This kit applies to LGM/LCM, LGH/LCH, KG/KC/KH, ZG/ZC/ZH, QG/QH/QC unit standard performance economizers and LGM/LCM/LGH/LCH high performance economizers. A separate kit is used for KG/KC/KH, ZG/ZC/ZH and QG/QH/QC high performance economizers. Refer to economizer installation instructions.

Note – Differential sensor applications must use the same two sensors.

TABLE 1

Differential enthalpy not available with ZG/ZC/ZH and QG/QH/QC units.

Install Sensors

Note – Install the return air sensor before installing optional power exhaust dampers and gravity exhaust dampers. If gravity exhaust, power exhaust, or hoods are already installed, remove from unit

1. Disconnect all power to unit.
2. Remove unit top back panel and retain screws. If economizer is already installed, remove hood.
3. Install sensors as shown in table 2.

TABLE 2

P104 not used; disconnect S175, reconnect to A7. J105 provided in unit. Differential enthalpy not available with ZG/ZC/ZH/QG/QC/QH units.

Wire A7 Sensor

Note – S175 is factory-installed and wired in KG/KC/KH/ZG/ZC/ZH 024-300S economizers. Kit P104 harness is not used. When replacing S175 with an A7 enthalpy sensor, wire A7 with disconnected S175 wires.

1. Connect P104 harness plug to unit J104. See figure 1 for 024-090 units, figure 2 for 092-150 units, and figure 3 for 156-300S units.
   Note – Wiring to sensor is shown on D or D1 economizer wiring section. D or D1 is located on the compressor access panel or packaged with economizer
2. Connect the wires on the other end of the harness to A7 terminals S and + as marked on the wires. Make sure polarity is correct.

Wire A62 Sensor – LG/LC/KG/KC/KH
Note – Discard J105 harness provided in kit when installing LGH/LCH units.

1. Connect P105 harness plug to unit J105. See figure 1 for 036-072 units, figure 2 for 092-150 units, and figure 3 for 156-300S units. On KG/KC/KH units refer to Wire A6 section in this instruction to install J105.
   Note – Wiring to sensor is shown on D or D1 economizer wiring section. D or D1 is located on the compressor access panel or packaged with economizer.
2. Connect the wires on the other end of the harness to A62 terminals S and + as marked on the wires. Make sure polarity is correct.
3. Reinstall gravity exhaust damper, power exhaust, and outdoor air hood when applicable.

Wire A6 Control – KG/KC/KH Units Only

1. Install J105 harness jack in panel as shown in figure 8 for 024-090 units, figure 9 for KG/KC/KH 092-150 units and figure 3 for 180-300S units.
2. Remove resistor between A6 enthalpy control terminals SR+ and SR. See figure 7.
3. Connect the two leads from the wire harness to SR+ and SR terminals on the A6 control. Note the labeling on the wires for correct wiring.
4. Turn A6 control setpoint dial completely clockwise to position “D”. See figure 7.

Prodigy 2.0 M3 Unit Controller Configuration

Configure the Unit Controller for the enthalpy sensor use using the following menu: Go to SETUP / INSTALL and navigage through the various setup questions until Configuration ID 1 appears. Position two needs to set to either S for economizer – single enthalpy or D for economizer – dual enthalpy.

Prodigy M4 Unit Controller Configuration
Configure the unit through the mobile app. Go to SETUP /RTU Menu > Setup Install and navigate through the various setup questions until Configuration ID 1 appears. Position two needs to be set to either S for economizer – single enthalpy or D for economizer – dual enthalpy

Note – Refer to M4 Setup Guide provided with the unit for more info.

Operation

Refer to Unit Controller manual for start-up and operation.

Documents / Resources