Aiko CTH3-80, CTH3-150, CTH3-200, CTH3-115 service manual Analog Control Signal Wiring Diagram

Page 53

SECTION 10: WIRING

For 4-20mA control of the heater(s) firing rate, the following control conditions apply:

ON/OFF relay at the external controller or BMS must be wired to R and W terminals on the heater control board to turn the heater ON and OFF.

(Open Circuit = OFF, Closed Circuit = ON). Minimum rated input at 1% of signal (0-4 mA). Full rated input at 90% of signal (18 mA). Input varies linearly between 4 mA and 18 mA.

BMS controllers often offer PID loop control that can optimize output signal and rate of change of the output signal. Common analog application is defined as follows:

1.BMS sensors that monitor zone air

temperatures are located in the heating space.

FIGURE 27: Analog Control Signal Wiring Diagram

2.Based on sensed temperatures, the BMS will

output an analog signal for the desired heater(s) firing rate.

3.As heater(s) receive the analog signal from the BMS, the heater(s) modulate to the correspond- ing firing rate.

4.As sensed air temperature rises closer to the desired temperature setpoint, the BMS will reduce the output signal, in turn reducing heater firing rate.

5.Upon satisfying temperature setpoint, the BMS will either:

a.Turn off the heater.

b.Reduce the signal so that the minimum heater firing rate is maintained until the sensed temperature rises above the setpoint to a cut-off limit temperature when the BMS turns off the heater.

ON/OFF SWITCH

CENTRAL HEATER CONTROL

REQUIRED

 

 

*OPTIONAL

 

SWITCH

 

THERMOSTAT

 

T24

 

R

 

T25

 

W

SATELLITE HEATER CONTROL

THERMOSTAT

T24

R

T25

W

+

 

T26

 

INPUT + -

 

ANALOG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T27

 

 

 

 

 

 

 

 

 

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THERMISTOR

 

 

 

 

 

 

 

 

 

 

 

REMOTE ANALOG

T13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIGNAL FROM SEPARATE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROLLER

T14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0-10Vdc OR 4-20mA

 

 

GN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

ANALOG INPUT CONTROL IS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BAR

SLIDE

 

 

 

 

 

 

 

 

 

USED TO SELECT ANALOG

 

 

 

 

 

 

 

 

 

 

 

 

 

SIGNAL TYPE 0-10Vdc OR 4-20mA

 

 

T16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GN

 

 

 

 

 

 

 

 

 

 

 

(4-20mA POSITION SHOWN).

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HIGH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T18

 

WIPER

 

EXT. POT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J9

 

 

 

 

 

T19

 

GN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

FIRING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RATE IN

 

 

 

 

 

 

 

 

J10 JUMPER POSITION

 

 

T29

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHOWS "CENTRAL"

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DESIGNATION AND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T26

T27

T13

T14

T15

T16

T17

T18

T19

T28

T29

INPUT + -

ANALOG

GN

 

THERMISTOR

 

 

D

 

 

BAR

SLIDE

GN

 

 

D

 

 

HIGH

 

 

WIPER

 

EXT. POT

GN

 

 

D

 

 

+

 

FIRING

IN

RATE

-

 

 

J9

FOR SATELITTE

CONTROLLERS, J9 JUMPER CAN BE LEFT IN ORIGINAL POSITION REGARDLESS OF CONTROL METHOD.

 

T30

 

 

 

 

 

 

 

"ANALOG" CONTROL METHOD.

 

 

+

RATE

FIRING

 

 

 

 

 

 

OUT

 

A B

 

T31

 

 

 

 

 

 

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J10

 

 

 

 

 

 

 

 

 

 

 

 

 

MODULATION CONTROL WIRING

TO SATELLITE HEATERS

T30

 

 

 

 

J10 JUMPER POSITION

 

 

 

+

FIRING

 

 

SHOWS "SATELLITE" DESIGNATION.

 

 

 

 

 

 

 

 

 

RATE OUT

A B

T31

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J10

MODULATION CONTROL WIRING

TO ADDITIONAL SATELLITE

HEATER CONTROL TERMINALS

T28 and T29.

*Separate on/off switch is optional for "satellite" heaters (install at user level). On/Off switch is used to disable heater operation or reset a heater that is in "lockout" mode. If on/off switch is not desired, leave jumper wire between R and W terminals in place.

47 of 71

Image 53
Contents Gas-Fired, Low Intensity Unitary Heater Page Roberts-Gordon LLC Page Table of Figures Page Manpower Requirements Heater SafetySafety Labels and Their Placement California PropositionTop and Bottom Panel Label Placement Side and Back Panel Label Placement Wall Tag Installer ResponsibilityCorrosive Chemicals National Standards and Applicable CodesInches Centimeters Model Maintain clearances to combustibles at all times for safetyONE Side Reflector Tube TUBE, Standard ReflectorUnapproved Foot Deco Grille and Protective GrilleNational Standards and Applicable Codes Major Components Model Tubing Length Core Packages Minimum Aluminized Standard Parts ListHeater Installation Typical Suspension Details Linear Heater Assembly Overview Linear Heater Layout Overview Tube Clamp Package Installation Burner Tube InstallationInsert tubes into coupling Tighten coupling to join tubes Coupling and Tube AssemblyTurbulator Installation 2 Coupling and Tube AssemblyHanger Burner Tube Reflector Reflector InstallationDescription Part Number Reflector Support Package 1 Reflector, U-Clip and Reflector Support InstallationWindow facing down Burner InstallationTube Configuration Optional Heater AccessoriesTube Heater Assembly Overview Tube Heater Layout Overview 3 Reflector Joint Installation Elbow Package Configuration .2.1 Elbow Installation2 Elbow Installation Reflector Joint Detail 4 Reflector Joint Installation 5 Reflector Joint DetailReflector Side Extension 2 Side Reflector InstallationScr ews 2 Frame Shield Installation 3 Grille Installation 2 Grille End Cap InstallationUnvented Operation United States RequirementsCanadian Requirements Vertical Venting Horizontal VentingUnvented Operation Tube Termination Length RequirementsCommon Side Wall Venting Vertical Ventilation 4 10 cm PipeCommon Vertical Venting Side View Vertical Outside Air Supply for Single Heater InstallationOutside Combustion Air Supply TOP View Vertical Outside Air Supply for Double Heater InstallationGAS Piping Correct Positions Standard Heater Configuration WiringCentral and Satellite Heaters Zoning Capability Central Heater ConfigurationSatellite Heater Jumper Setting Satellite Heater ConfigurationCommunication Wiring within a Zone of Heaters Communication Wiring within a Zone of Heaters Thermostat Heat Demand Control WiringZone Sensor Sequence of Operation for Modulating Thermostats Analog Signal Modulating Thermostat P/NMS/TP Wiring Cable Termination Power RequirementsRemote Analog Signal Analog Control Signal Wiring Diagram Potentiometer Control Device Potentiometer Control Wiring DiagramThermostat, modulating Description Part Number Modulating Thermostat Wiring Diagram with BACnet optional Internal Wiring Ladder Diagram Electrical Connection to the Burner Line Voltage Power WiringLow Voltage Control Wiring Installation Pre-Season Maintenance and Annual Inspection Operation and MaintenanceSequence of Operation To Shut Off HeaterVicinity of the Heater Installation Code and Annual InspectionsVehicles and Other ObjectsSafety Labels MA wiring Suspension PointsGas Line Burner ObservationTroubleshooting General LED Codes Control LEDTroubleshooting Troubleshooting Flow Chart Troubleshooting Manifold Gas Pressure Measurement Pneumatic Connections Replacement Parts Replacement Parts Description Part Number Dimensions General SpecificationsGAS Pressure AT Manifold Pipe ConnectionPage ROBERTS-GORDON will PAY for Warranty is Void ifROBERTS-GORDON will not PAY for Limitations on Authority RepresentativesPage Page Page