60K-BTU-20FT-TUBE-HTR-180 User Manual

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Mr. Heater Series Heater Operating Instructions and Owner’s Manual

SECTION 7

Wiring

Heatersarenormallycontrolledbythermostats.Linevoltage

thermostatsarewireddirectly(seeFigure15),24Vthermostatsare

wireddirectlyusingtheterminalsonburnerbox(seeFigure16).

HeatersmustbegroundedinaccordancewiththeNationalElectric

CodeANSI/NFPA-70orcurrentCanadianElectricalCode,CSA

C22.1.Heatersmayalsobecontrolledwithamanuallinevoltage

switchortimerswitchinplaceofthethermostat.

FIGURE 15: Line Voltage Thermostat Wiring

120v – 60 Hz

White

Green

Supply Circuit

120v – 60 Hz

Supply Circuit

Burners

(Maximum – 2 per Thermostat)

Burners

(Maximum – 1 per Thermostat)

Black

FIGURE 16: Low Voltage Thermostat Wiring

120v – 60 Hz

White

Green

Supply Circuit

120v – 60 Hz

Supply Circuit

Burners

(Maximum – 2 per Thermostat)

Burners

(Maximum – 1 per Thermostat)

Black

FIGURE 17: MR. Heater Burner Internal Wiring

• Ifanyoftheoriginalwireassuppliedwiththe

appliancemustbereplaced,itmustbereplacewith

wiringmaterialhavingatemperatureratingofatleast

105°Cand600volts.

• Eachburnermustbeelectricallygroundedin

accordancewiththeNationalElectricCodeANSI/NFPA

-70orcurrentCanadianElectricalCode,CSAC22.1.

FIGURE 18: MR. Heater Burner Internal Wiring Ladder Diagram

VAC

120

120V

24V

Black

Purple

Yellow

Black

Green

Orange

Transformer

White

THERMOSTAT

White

Blue

Gas Valve

Air Switch

Ignitor

Sensor

Motor / Blower

Door Switch

Terminal

Bushing

120V

(NEUTRAL)

White

Gray

Orange

Transfomer

Thermostat

Air Switch

Gas Valve

Door Switch

Motor / Blower

Ignitor

Sensor

Blue

Yellow

Purple

Black

L2 (HOT)

24V

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User Manual - Page 18