Enerco HSU 45, HSU 75 operating instructions Service

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minimum of 5.0” w.c. for natural gas or 10.4” w.c. for LP/ propane gas should be maintained for proper unit operation.

2.After line pressure has been checked and adjusted, check manifold pressure. Correct manifold pressure is shown on the unit rating plate. See figure 10 for gas pressure adjustment screw location. A natural gas to LP/propane gas changeover kit is required to convert unit. Refer to installation instructions provided with changeover kit for conversion procedure.

LIMIT CONTROL

The limit control switch is factory set and not field adjustable.

LOUVER VANE ADJUSTMENTS

TABLE 4

NATURAL GAS MANIFOLD PRESSURES - IN.WG. (KPA)

 

 

ALTITUDE FT. (M)

 

 

 

 

MHU45/75 HSU45/75

 

0-2000

2000-4500

 

 

(0-610)

(610-1370)

 

 

 

 

45/75

 

4.0 (0.99)*

3.6 (0.89)

 

 

 

 

*No adjustment required.

TABLE 5

LP/PROPANE GAS MANIFOLD PRESSURES - IN.WG. (KPA)

 

 

ALTITUDE FT. (M)

 

 

 

 

MHU45/75 HSU45/75

 

0-2000

2000-4500

 

 

(0-610)

(610-1370)

 

 

 

 

 

 

 

 

45/75

 

10 (2.49)*

8.0 (1.99)

 

 

 

 

*No adjustment required.

Rotate louver vanes to direct airflow upward, downward, straight, or any combination of these directions. When unit is installed

in an inverted position, louvers may be positioned in the same manner.

COMBUSTION AIR PRESSURE SWITCH

This pressure switch checks for proper combustion air blower operation before allowing an ignition trial. The switch is factory set and no field adjustment is necessary.

FLAME ROLLOUT SWITCH

The flame rollout switch(es) are located on the burner box top, behind the ignition control board. This normally closed switch opens on a temperature rise. Check for adequate combustion air before manually resetting switch.

SERVICE

CAUTION Turn off gas and electrical power to unit before performing any maintenance or service operations on this unit.

Remember to follow lighting instructions when putting unit back into operation after service or maintenance.

If any of the original wire as supplied with the appliance must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C.

Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and replace any gas control which has been under water.

BURNERS

1.Periodically examine burner flames for proper appearance during the heating season.

2.Before each heating season examine the burners for any deposits or blockage that may have occurred.

3.Clean burners as follows:

Turn off both electrical and gas supplies to unit.

Disconnect gas supply piping, high tension and sensor leads. Remove gas manifold. Remove burner tray.

Clean burners as necessary. Make sure that burner heads line up properly to ensure flame crossover. Check spark gap on electrode and adjust if required. The gap should be between 0.110 inch and 0.140 inch (2.79mm to 3.56mm). The gap may be checked with appropriately sized twist drills or feeler gauges.

Reinstall burner tray, gas manifold, high tension and sensor leads. Reconnect gas supply piping.

Restore electrical power and gas supply. Follow lighting instructions to light unit. Check burner flame.

FLUE PASSAGEWAY AND FLUE BOX

The flue passages and flue box should be inspected and cleaned prior to each heating season. The sequence of operation should be as follows:

1.Turn off both electrical and gas supply to unit.

2.Disconnect combustion air blower wiring.

3.Remove screws securing flue box to unit. Remove flue box. If necessary, remove blower assembly from flue box. Clean flue box with wire brush.

4.Remove turbulator retention bracket and turbulators. Clean turbulators with wire brush.

5.Remove burners as described in section “BURNERS” section.

6.Clean tubes with a wire brush.

7.Reassemble unit. The combustion air and flue box gaskets should also be replaced during reassembly.

8.Restore electrical power and gas supply. Follow lighting instructions to light unit. Check operation of unit.

COMBUSTION AIR BLOWER

Under normal operating conditions, the combustion air blower should be checked and cleaned prior to the heating season with the power supply disconnected. Use a small brush to clean blower wheel.

Enerco Compact Unit Heater

13

Operating Instructions and Owner’s Manual

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Contents MR. Heater For Your SafetyStarting Serial Numbers HSU75LPGeneral Hazard Warning ContentsTOP View MHU45/MHU75 and HSU45/HSU75 Unit DimensionsBack View Side View START-UP and Performance Check List Shipping Garage InstallationsRequirements CSA in the USA Requirements CSA in CanadaCombustion and Ventilation AIR Unit Heater InstallationVenting General Recommendations and RequirementsVent Termination on Single Wall Vent Horizontal Venting GeneralRoof Flashing Roof Pitched Clearance Shall not be Athimble Concealed SpaceHorizontal Venting Commercial Refer to for maximum vent connector lengthsHorizontal Venting Residential Condensate Drain Through TEE Pipe and Drain LoopHorizontal Venting Residential Installation Venting Using a Masonry ChimneyRemoval of Unit from Common Vent Vent Termination CAP Listed Thimble Through Combustion WallElectrical Connections Line Voltage Field WiringGAS Supply Connection GAS Supply to Unit HeaterLeak Check GAS ConnectionStart UP and Operation Unit START-UPAdjustments Service Ladder Diagram Electrical Repair PartsFlue and Chimney Failure to OperateSee Back page for Parts Ordering Information Parts ListEnerco Compact Unit Heater Limited Warranty For Information Regarding ServiceParts Ordering Information Dœuvre-main Comman LA SUR OrmationsinfLimitée Garantie Fabricant du directementCompacts chauffage de Appareils nercoE Listepiècesdes VI Intentionnellement Électrique CircuitLaissée ÉTÉ a Colonne Cette NE Lappareilpas IonnePANNEAUCOMMAN6À Nnecteurd Schémacâblageavecduappareilsdes Escalier EN IagrammedCondu Uitd LimiteurCommutateur AGE Chau RéglagesLappareil GazduSoupape LA Pour RobertshawVériicationf ET ÉmarragedonctionnementfAvertissement AvertissementChaude GAZ EN Alimentation Tension LA À Place SUR CâblageMaçonnerie EN Horizontale Ventilation Rési InstallationCheminée UNE Utilisant Ventilationf Commune VentilationMilieu CommercialHorizontale Ventilationd RésientieldVentilationb ET Commerciales InstallationsHorizontale Ventilationc VEN Wallt Single on Termination VentET Combustiond Eair AGE InstallationVentilation AtionsHangars Garage UN ANS InstallationsAéroned EXIGENCES.U-.É AUX SALatérale VUE Arrière VUE HSU45/HSU75 ET MHU45/MHU75DENSIONS AppareilsdesPlan EN VUE 171 3/4-6 108 1/4-4 165 1/2-6 140 1/2-5 432 305Avertissement AngercmmoTablematièresdes Elgénérale EDébut de série de Numéros Pour UFF P CHD EAver Reila AP

HSU 45, HSU 75 specifications

Enerco HSU 75 and HSU 45 are standout models in the realm of portable heating solutions, designed for efficiency and convenience. These units serve a range of applications, from construction sites to workshops, and even for personal use in outdoor settings. With their robust engineering and advanced features, they are ideal for anyone needing reliable warmth in cold conditions.

One of the main features of the Enerco HSU series is their impressive heating capacity. The HSU 75 offers a maximum output of 75,000 BTU, making it suitable for larger spaces, while the HSU 45 delivers 45,000 BTU, perfect for smaller areas. This flexibility allows users to choose the right model based on their specific heating needs.

Both models utilize a forced air heating system, which efficiently circulates warmth throughout the space. This technology ensures rapid heating, allowing for immediate relief from the cold, an essential feature in situations where time is of the essence.

Durability is another key characteristic of the HSU series. Constructed with heavy-duty materials, these units are built to withstand the rigors of demanding environments. The robust design makes them suitable for outdoor use, capable of enduring tough weather conditions without compromising performance.

Safety is paramount with Enerco heaters, and both the HSU 75 and HSU 45 come equipped with safety features such as automatic shut-off sensors and flame failure devices. These innovations give users peace of mind, knowing that the unit will operate safely even in unpredictable environments.

Portable design is a hallmark of these heaters, featuring built-in handles and a lightweight structure. This makes it easy for users to transport the units from one location to another, enhancing their versatility in use.

Finally, both models are compatible with various fuel sources, allowing for flexibility based on user preference and availability. Whether using propane or natural gas, users can enjoy efficient heating tailored to their requirements.

In conclusion, the Enerco HSU 75 and HSU 45 represent a perfect blend of power, safety, and portability. Their advanced features and durable build make them ideal companions for anyone needing dependable heat in diverse scenarios. With these units, warmth is always within reach, ensuring comfort regardless of the harshness of the outdoor conditions.