Enerco MHU 45, MHU 75 owner manual Electrical Connections, Figure Gas Supply Connection

	LINE VOLTAGE FIELD WIRING
	UNIT
L1	BLACK
	BLACK
N	WHITE
	WHITE

EQUIPMENT

GROUND

BLACK WIRE WITH WHITE TAPE OR

WHITE WIRE WITHOUT TAPE

FIGURE 7

GAS SUPPLY CONNECTION

	MANUAL
	MAIN SHUT-OFF VALVE
	(FURNISHED BY INSTALLER)
GROUNDED
JOINT UNION
1/8 NPT	GAS FLOW
PLUGGED TAP
DRIP LEG

FIGURE 8

GAS SUPPLY TO UNIT HEATER

MANUAL MAIN SHUT-OFF
VALVE WILL NOT HOLD
NORMAL TEST PRESSURE	ISOLATE
	GAS VALVE
CAP
UNIT HEATER

FIGURE 9

5.Test for spillage at the draft hood relief opening after five minutes of main burner operation. Use the flame of a matchor candle, or smoke from a cigarette, cigar, or pipe.

6.After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous condition of use.

7.If improper venting is observed during any of the above tests, the common venting system must be corrected. The common venting system should be resized to approach the minimum size as determined by using the appropriate tables in Appendix G in the current standards of the National FuelGas Code, ANSI Z223-1 in the U.S.A. and the appropriate Category I Natural Gas and Propane appliances venting sizing tables in the current standards of the CSA B149.1 Natural Gas and Propane Installation Code in Canada.

NOTE Local codes may supersede any of the above provisions.

ELECTRICAL CONNECTIONS

NOTE The MHU/HSU series unit heaters use a direct spark ignition system. There is no pilot necessary as the spark lights the main burner as the gas valve is turned on. The direct spark ignition

WARNING

Electric shock hazard. Can cause injury or death. Do not use this heater if any part has been under water. Immediately call a qualified service technician to inspect the furnace and to replace any part of the control system and any gas control which has been under water.

WARNING

Danger of explosion. Can cause injury or product or property damage. If over- heating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electrical supply.

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

WARNING

Danger of explosion and fire. Can cause injury or product or property damage. You must follow these instructions exactly.

Enerco Compact Unit Heater 9 Operating Instructions and Owner’s Manual