Engineered air EngA M-TRAC4 Istruzioni per il montaggio

IOM-33 Dec 16 R4

USER OPERATION

MANUAL

FOR

M-TRAC4

DIRECT FIRED HEATING CONTROLLER

UNIT MODEL NO. _________________

UNIT SERIAL NO. _________________

SERVICED BY: ___________________

TEL. NO: ________________________

CANADIAN

HEAD OFFICE

AND FACTORY

USA

HEAD OFFICE

AND FACTORY

CANADIAN

EASTERN FACTORY

1401 HASTINGS CRES. SE

CALGARY, ALBERTA

T2G 4C8

Ph: (403) 287-2590

Fax: 888-364-2727

32050 W. 83rd STREET

DESOTO, KANSAS

66018

Ph: (913) 583-3181

Fax: (913) 583-1406

1175 TWINNEY DRIVE

NEWMARKET, ONTARIO

L3Y 5V7

Ph: (905) 898-1114

Fax: (905) 898-7244

SALES OFFICES ACROSS CANADA AND USA

Retain instructions with unit and maintain in a legible condition.

Please give model number and serial number when contacting

factory for information and/or parts.

www.engineeredair.com

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M-TRAC4

The M-TRAC4 has been certified by Intertek (ETL) for use with Engineered Air appliances only.

It has been evaluated to CSA C22.2 No. 24 Temperature-Indicating and Regulating Equipment

and UL 873 UL Standard for Safety Temperature-Indicating and Regulating Equipment. This is a

User Operation Manual and therefore not subject to evaluation.

If any errors or omissions are noted please contact the nearest Engineered Air Technical Service

Department.

To ensure warranty is honored, only qualified personnel should be employed for service and

troubleshooting. If further information is required please contact the nearest Engineered Air

office.

There are two sets of electrical drawings and unit function sheets provided with the appliance.

One set is in an envelope which also contains the Operation, Installation and Maintenance

manual(s). This package is for copying, then should either be returned to the appliance or

stored in a safe place. The other set is attached to the control panel door and should never be

removed.

Please report any omissions to the national service manager.

Warning:

Improper installation, adjustment, alteration, service or maintenance can cause

property damage, injury or death. Read the installation, operating and

maintenance instructions thoroughly before installing or servicing this equipment.

Warning:

This unit is connected to high voltages. Electrical shock or death could occur is

instructions are not followed. This equipment contains moving parts that can start

unexpectedly. Injury or death could occur if instructions are not followed. All

work should be performed by a qualified technician. Always disconnect and lock

out power before servicing. DO NOT bypass any interlock or safety switches under

any circumstances.

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TABLE OF CONTENTS

INTRODUCTION .............................................................................................................................................................5

CONTROLLER RATINGS ..................................................................................................................................................5

CONTROLLER DESCRIPTION...........................................................................................................................................6

TERMINALS ................................................................................................................................................................6

DIP SWITCHES............................................................................................................................................................7

INDICATION AND DIAGNOSTIC LIGHTS......................................................................................................................7

ADJUSTMENT POTS....................................................................................................................................................7

MULTIMETER TEST POINTS............................................................................................................................................8

MAXIMUM DISCHARGE SET POINT LIMIT SETUP (SP LMT) .......................................................................................8

CALCULATED SETPOINT (SPC)....................................................................................................................................8

DISCHARGE TEMPERATURE (DTEMP) ........................................................................................................................8

PROFILE PLATE VELOCITY...........................................................................................................................................9

LOCKOUT RESET.........................................................................................................................................................9

CONTROL .....................................................................................................................................................................10

SYSTEM TIMING.......................................................................................................................................................10

DISCHARGE AIR SETPOINT .......................................................................................................................................10

DISCHARGE AIR SENSOR ..........................................................................................................................................10

LOW LIMIT ...............................................................................................................................................................10

DAMPER CONTROL ..................................................................................................................................................11

BLOWER CONTROL ..................................................................................................................................................11

BURNER CONTROL...................................................................................................................................................11

PROFILE PLATE VELOCITY SENSING SYSTEM............................................................................................................12

TEMPERATURE RESET ..................................................................................................................................................12

MAKE / BREAK THERMOSTAT..................................................................................................................................12

2 –10 Vdc SIGNAL (BMS).........................................................................................................................................12

OPERATION..................................................................................................................................................................13

EXHAUST FAN INTERLOCKING .................................................................................................................................13

LOW FIRE .................................................................................................................................................................13

CALIBRATION ...............................................................................................................................................................14

SETPOINT (SPC)........................................................................................................................................................14

DISCHARGE AIR TEMPERATURE (DTEMP)................................................................................................................14

PROFILE VELOCITY ...................................................................................................................................................15

2-10 VDC RESET SET UP ...........................................................................................................................................15

SERVICE........................................................................................................................................................................15

SERVICE MODE ........................................................................................................................................................15

SETTING HIGH CAPACITY .........................................................................................................................................15

SETPOINT REMOTE WIRING.....................................................................................................................................15

AIR PRESSURE SENSOR ............................................................................................................................................16

INPUT CONTACTS BY OTHERS..................................................................................................................................16

BMS SENSOR LOCATION ..........................................................................................................................................16

VFD FEEDBACK ADJUSTMENT..................................................................................................................................16

M-TRAC4 LOCK OUT DESCRIPTION..........................................................................................................................18

SENSOR TABLE .........................................................................................................................................................18

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INTRODUCTION

The M-TRAC4 is a discharge air temperature controller of variable volume direct-fired

Engineered Air equipment. The M-TRAC4 maintains the required burner airflow by modulating

the burner profile bypass damper (or return air damper on RE style equipment).

The information used in this manual should be used in conjunction with the unit function

sheet(s) and the HE (or RE) series Installation, Operation, and Maintenance manual.

The M-TRAC4 is designed to control only Engineered Air equipment.

Note: It is necessary that all of the remote wiring and controls be complete and operational

before starting the appliance.

Various upgrades and improvements have been made over time. Always include any suffix

letters and numbers for trouble shooting or replacement. All M-TRAC4 models are backwards

compatible; however some additional wiring may be required.

CONTROLLER RATINGS

Power requirements: 24 Vac, 40 VA.

Contact Rating: 120V 3A inductive

2-10 Vdc input impedance: 2 k

Environment: -40 to 120°F (-40 to 50°C) non-condensing.

Fuse Rating: 1.25 GDC slow-blow

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CONTROLLER DESCRIPTION

TERMINALS TABLE 1

Terminal

Description

Input terminal for single discharge sensor

Input terminal for two discharge sensors wired in series

Sensor common

Output from the built in set point POT.

Positive supply for a remote set point POT.

Return from the remote set point POT.

Setpoint enable

+ / -

2 to 10 Vdc temperature reset input

24 Vac hot

24 Vac neutral (ground)

Fan switch input

Heat switch input

LMT

Input from safety limit (high limit)

Neutral for the 120 Vac Main gas valve feedback

VFB 120

Hot for the 120 Vac Main gas valve feedback

Flame relay control

CFR

Flame relay control common

PV1 / PV2

Pilot Valve control contacts

Input power supply to feed DM, SA and AL outputs

Damper enable output

Supply blower output

Alarm output or Reverse interlock control output

MX1 / MX2

Maxitrol valve output.

Output to air volume controller.

AFB

Air volume feedback input.

PPA

Burner bypass actuator output.

ASP

Air setpoint (volume) input.

Fixed 10Vdc output (+).

Reference 10Vdc output (-).

OA1 / OA2

Outside air temperature sensor.

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DIP SWITCHES

The M-TRAC4 options are configured by DIP switch selection and/or wiring connections. DIP

switch settings are noted on the internal wiring diagram, and should not be altered.

TABLE 2

DIP SW

Description

Service Mode. Enable to manually control the firing rate.

Air Priority Program. See Blower Control.

16 Second Pre-purge. Heating will delay on after fan starts.

Alarm contact to be used for reverse interlock. See Reverse Interlock.

Disable Open Sensor Checking. See Discharge Air Setpoint.

Disable Low Limit. See Low Limit.

Disable remote reset of failure codes.

2-10 Vdc Set Point Reset. See Temperature Reset.

VAV application.

INDICATION AND DIAGNOSTIC LIGHTS

There are 5 status lights on the M-TRAC4 labeled A to E. They operate in 4 patterns: an

irregular flash (.. __ .. __ ..), fast flash (…….), slow flash (. . .), or constantly on (_____).

TABLE 3

IRREGULAR

FAST

SLOW

LIGHT

System Lockout

System

Problem

System

A –GREEN

Wiring Or Flame

Relay Problem

Prepurge Cabinet

Limit Open

Ignition

Attempt

B –RED

Air Flow Or M-TRAC

Problem

Air Velocity Very Low

Air Velocity

Too Low

Air Velocity Too

High

C –RED

Service Mode

Ignition Failure

Heat Switch Open

Burner On

D –RED

Open Discharge

Sensor

Discharge Temp Low

Fan Switch Open

Damper Open

Delay

E –RED

ADJUSTMENT POTS

There are a number of setting and calibration potentiometers (POT’s) located on the face of the

M-TRAC4. Modifications to these should only be performed by experienced and qualified

personnel.

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TABLE 4

POT

Description

SP LMT

Limits the maximum discharge temperature set point.

CAL DTEMP

Discharge air sensor temperature calibration.

SP CAL

Setpoint dial calibration.

SERVICE POT

Manually sets burner firing rate for service. Located just above the centre.

When the service switch is on, this POT can be used to adjust the

modulating gas valve from low to high fire. When the service DIP switch is

on, light ‘D’ blinks irregularly.

2-10 Vdc

RESET RATIO

Sets the reset temperature range. This adjusts the amount of reset range

the 2-10 Vdc room thermostat will have. This allows an adjustment band

between 5°F and 50°F (3°C and 28°C).

PROFILE

VELOCITY

Allows a narrow adjustment for Profile pressure set point.

SA DAMPER MIN

POS

Adjusts the minimum output to the air volume controller (terminal AO).

MULTIMETER TEST POINTS

The M-TRAC4 has readout test points for discharge air temperature, discharge set point and

profile plate velocity status. Temperature readings are indicated by Vdc referenced to ground.

MAXIMUM DISCHARGE SET POINT LIMIT SETUP (SP LMT)

Regulations, design or authorities having jurisdiction may require limiting the maximum

discharge air temperature the appliance is allowed to reach. This may be set by the

potentiometer SP LMT, which is located below and to the right of the M-TRAC4 discharge set

point knob. Vdc readout = °C / 10. See Table 5.

CALCULATED SETPOINT (SPC)

The SPC measurement point is located just below the M-TRAC4 set point knob. This

temperature is the current operating set point after all applicable temperature resets have

been applied to primary or base set point. Vdc readout = °C / 10. See Table 5.

DISCHARGE TEMPERATURE (DTEMP)

The DTEMP measurement point is located on the top left corner of the M-TRAC. The voltage

reading relates to the actual temperature of the discharge sensor. Vdc readout = °C / 10. See

Table 5.

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Table 5

Voltage (Vdc)

˚C

˚F

1.5

2.5

3.5

104

NOTE: Sensor accuracy is diminished at temperatures greater than those noted in table 5.

PROFILE PLATE VELOCITY

The profile plate has been factory set for the airflow shown in the submittal record.

The profile plate air velocity status can be determined by reading the DC volts measured

between the profile measurement point (located close to terminal S) and terminal N. When the

profile velocity is optimum, the reading is 4.8 Vdc at high fire and full speed. 50% volume

should read 3.5 Vdc, and 33% should read 3.3 Vdc.

Note that if the airflow is reduced below safe operating conditions there are delays built into

the M-TRAC4 that will shut off the unit within 45 seconds.

TABLE 6

Test Point Reading

at high fire

Status

Result

Below 0.8 volts

Very low or no airflow

Unit lockout

Between 0.8 and

3.0 volts

Low airflow

If the burner is already off it is disabled. If the

burner is on, variable timed lockout.

Between 3.0 and

5.2 volts

Operating range

Normal

Over 6.0 volts

High airflow

If the burner is already off it is disabled. If the

burner is on, variable timed lockout.

LOCKOUT RESET

To reset the M-TRAC4 from a lockout condition push the “Reset Push Button” located just

above and to the right of the DIP switch block. If the M-TRAC4 loses line power while locked

out, the status codes (reason for the lockout) will be lost. When power is resumed the M-

TRAC4 will remain locked out, with only the green LED flashing irregularly.

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IOM-33 10 of 18 Dec 16 R4

CONTROL

SYSTEM TIMING

Blower startup: 54 seconds after terminal FS is energized.

Low Limit bypass: 4.5 minutes from initial startup, 50 seconds nuisance timer.

Trial for ignition: 30 sec.

DISCHARGE AIR SETPOINT

The M-TRAC4 is a discharge air temperature controller with a built in face mounted set point

knob (that is activated by connecting terminal S to SP). Optionally, the M-TRAC4 is available

with a remote set point, with varying set point ranges. When a remote setpoint is provided, the

M-TRAC4 face mounted set point will have no effect.

Additional methods of resetting the discharge air temperature setpoint may be used. Refer to

the unit function and electrical drawing.

DISCHARGE AIR SENSOR

The M-TRAC4 is designed to use either a single or dual discharge sensors, wired in series. Dual

sensors are always used in equipment with temperature rise over 100˚F (55°C) or with dual

fans. In most applications the discharge air sensor(s) is located in the supply blower outlet.

The discharge air sensor also serves as a low limit (or freeze protection) sensor.

The M-TRAC4 automatically checks the discharge air sensor(s). If the M-TRAC4 reads an open

sensor it will disable temperature control and reduce the firing rate to low fire, then shutdown

the appliance. Open sensor checking may be disabled by switching on DIP switch #5.

LOW LIMIT

The M-TRAC4 control is typically configured so that the discharge air temperature sensor also

performs the function of a low limit or freeze stat. If DIP switch 4 is ‘off’ the low limit function

is enabled. If the discharge temperature falls below 40˚F (4°C) the appliance will shut down and

the LED for low discharge temperature will begin flashing. On initial startup the M-TRAC4 will

internally bypass the low limit for 4.5 minutes. After this time, the low limit discharge

temperature must be below the low limit setpoint (40°F / 4°C) for 4 minutes before the

M-TRAC4 will shut the appliance off.

If DIP switch 4 is ‘on’, the low limit safety function is disabled.

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