Lennox LZP-2 User Manual 2

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Dallas, Texas, USA

Litho U.S.A.

504,926M 5/2004

LZP-2

ZONE CONTROL PANEL

INSTALLATION INSTRUCTIONS FOR ZONE CONTROL PANELS

USED WITH LENNOX HEATING AND COOLING EQUIPMENT

Shipping & Packing List

Package 1 of 1 contains the following:

(1) Model LZP-2 Zone Control Panel (1) Model 88K38 Temperature Sensor (1) Installation Instructions (1) Owners Manual (1) Warranty Card

Required Components (ordered separately):

24 VAC Transformer – The size of the transformer

needed is determined by the total power requirements for the control panel, thermostats and dampers. The control panel and thermostats together require 10VA. The dampers require 10VA each. The size of the transformer will depend on the greatest number of dampers that could be energized at any given time.

NOTE – When power closed/spring open dampers are used, at least one zone’s dampers will not be energized during a call for heating or cooling.

Thermostats – single-stage, electronic, 24-volt heat/cool thermostats which include a “C” (24VAC common) terminal. Do not use mechanical or power robbing thermostats.

Dampers – 2 or 3-wire, 24-volt dampers required. 2-wire, power closed/spring open preferred.

ZONING SYSTEM

TABLE 1 – TRANSFORMERS

Part Number Size Voltage Description

10P17 40VA 120/208/240V-24V

10P87 50VA 120/208/240V-24V

12P61 75VA 120/208/240V-24V

83P74 4" Square Electrical Box

FIGURE 1 – LENNOX®MODEL LZP-2 CONTROL PANEL LAYOUT

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Application

• Two zones

• Single-stage electric or gas furnace

• Single-stage air conditioner

• Multi-stage equipment can be used provided that it stages on it’s own internal controls

• Not applicable to heat pump systems

Installation

• Install the control panel indoors only.

• Do not install the control panel where the temperature will exceed 140°F or will drop below 32°F.

• Do not install the control panel on foundation walls, HVAC equipment or duct system where moisture may condense on the enclosure.

• Do not install the control panel in a room where it will be exposed to elevated humidity levels such as a laundry room.

1. Remove the cover. Replace the cover when

installation is complete.

2. There are eight slots on the base of the enclosure

(see Figure 2).

3. Use #8 screws (field supplied) to install the base.

Features

• Adjustable high and low discharge air temperature limits

• ON/OFF duct air purge control

• LED indicators for outputs

• Time Delay Override

• 2 or 3-wire damper compatibility

FIGURE 2 – CONTROL PANEL AND ENCLOSURE BASE

CAUTION

Electrostatic discharge can damage the control. Touch a grounded metal object before touching the circuit board, and then only touch the circuit board on the edges when handling.

(8) Mounting

Slots

The above illustration shows a typical two zone control system.

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.

EQUIP.

24VAC

DAS

R43

R44

C18

R45

RV4

SPARE FUSE

MAIN FUSE

LENNOX

X3785 REV. 1

RV1

RV5

LZP-2

D14

D13

D12

R17

D15

R20

D17

SW1

C10

TDO

C12

C15

RV6

PURGE

HT-160

CL-45

GND

24VDC

NORMAL

FLASHING

R10

C16

GAS

R18

R19

ELECT.

NoPURGE

140

D11

TP4

R21

R39

R38

R37

C21

C19

C20

5VDC

D10

R12

R13

R11

D19

D18

R23

C13

R40

C22

R22

D20

R28

R30

D22

D23

R36

R35

R41

R42

R47

R46

R14

ZONE 1

R15

R16

RV2

DamperZ1

ZONE 2

DamperZ2

RV3

D16

C11

R25

R24

R26

R27

C14

R29

D21

C17

R34

R32

R33

R31

RV7

D24

RV8

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Installation (continued)

FIGURE 3 – DISCHARGE AIR SENSOR LOCATION

IMPORTANT: The discharge air sensor is required.

If a short or open circuit is detected between the Plenum Sensor terminals, the control panel will only respond to Zone 1 and the dampers will stay in the open position.

4. Install and Wire the Discharge Air Temperature Sensor

The tip of the sensor must be located in a region of fully mixed supply of air before the take-offs (not in a dead air space) in order for the system to work correctly.

a. Wire discharge air temperature probe to control

panel using thermostat wire. Note that the temperature sensor is not polarity sensitive.

b. Be sure that the tip of the sensor is located at

least 15 inches downstream from the leaving air side of the evaporator in the discharge plenum, and 1/3 of the depth (D/3) of the plenum (D) from the front of the plenum (the front is the side with the furnace or CB access doors), and centered side to side. Move the adjustable bracket along the length of the discharge air sensor to achieve proper sensor tip location (tip of sensor to be located at W ÷ 2). The sensor can be inserted from any side of the plenum, as long as the tip of the sensor is in the correct position. See Figure 3.

CAUTION

As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

CAUTION

Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch.

15"

D/3

FRONT

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6. Install the thermostats. Refer to the instructions

provided with the thermostat.

Any 24-volt electronic thermostat with a “C” (24 VAC common) terminal can be used. Power robbing thermostats can cause unintended operation – DO NOT use mechanical or power robbing thermostats. Table 2 lists the required terminals and recommended Lennox thermostats:

18 AWG thermostat wire minimum recommended.

TABLE 2 – THERMOSTAT REQUIREMENTS

Recommended

Type Terminals

Thermostat

HEAT/COOL R, C, W, Y, G

• SignatureStat 1H/1C (51M26)

• Elite 1H/1C (49M55)

Thermostat Terminal Function

R 24 VAC Hot

C 24 VAC Common

W Heat

Y Cool

GFan

7. Install the dampers. Refer to the instructions provided with the damper.

18 AWG thermostat wire minimum recommended.

Installation (continued)

5. Install the required transformer selected from Table 1

– DO NOT USE the HVAC equipment transformer to power the control panel. Refer to the instructions provided with the transformer.

18 AWG thermostat wire minimum recommended.

Sizing the Transformer:

The system requires approximately 10 VA for the control panel and thermostats and 10 VA for each damper. The size of the transformer will depend on the greatest number of dampers that could be energized at any given time (at least one zone’s dampers will not be energized during a heating or cooling call when using power close, spring open dampers). The size of the transformer must not exceed 75VA. If the value is greater than 75VA, some dampers will need to be powered by a separate transformer – refer to Field Wiring Damper Diagram 2 on page 6.

For instance, if you have 3 dampers, then you would require 10VA for the system, 20VA (10VA X 2) for the dampers for a total of 30VA, so catalog number 10P17 would be an adequate transformer size at 40VA.

The transformers listed in this chart include a plate mount for a 4" square electrical box.

TABLE 1 – TRANSFORMERS

Part Number Size Voltage Description

10P17 40VA 120/208/240V-24V

10P87 50VA 120/208/240V-24V

12P61 75VA 120/208/240V-24V

83P74 4" Square Electrical Box

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