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GUX Series Explosion Proof Unit Heater
- Corrosion-resistant constructions suitable for most applications
– Welded steel heat exchanger with powder-coated cabinet for dry, non-corrosive areas includes
– 316 stainless steel for waste water treatment plants
– Heresite® coating for chemical plants with chlorides
– IP55 motor and type 4 outdoor rated enclosure for wet locations—meets UL 1004-1 raintight requirements - Industry’s lowest ignition temperature code rating, T3C, 320°F (160°C)
- Automatic and manual reset overtemperature cutouts
- Low 70 PSIG relief valve setting—in an emergency, the initial escaping vapor is below the ignition temperature
Standard Construction Features:
- Industrial grade, corrosion resistant cabinet/louvers fabricated from beige powder coated 14-gauge galvanized steel with minimum opening safety stops
- Industrial grade heating elements are treated, to provide freeze protection as low as -49°F (-45°C)
- The prewired fan motor assembly has double-shielded, permanently lubricated ball bearings and automatic reset line breaking thermal overload protection—separate field wiring to the motor is not required
- Factory built-in controls include overtemperature cutouts, controlling magnetic contactor, and 24-volt control circuit transformer housed in a NEMA 7, 9 cast aluminum enclosure
Technical Specifications:
Temp Range: 50°–120°F (10°–49°C)
CFM: 550–3850
Classes:
Class I, Divisions 1 and 2, Groups C & D
Class II, Divisions 1 and 2, Groups E, F & G
Class I, Zones 1 and 2, Group IIB
Ideal Spaces:
Aircraft Hangars/Service Areas
Chemical Storage/Handling Areas
Coal Preparation Plants
Compressor Stations
Grain Elevators & Petrochemical Plants
Oil Refineries & Rigs
Paint Storage Areas & Spray Booths
Sewage Pump Stations
Treatment Plants
60 Hz Models & Specifications:
*Total Amps = Heating element and motor amps.
**Approximate air temperature rise
50 Hz Models & Specifications:
*Total Amps = Heating element and motor amps
Factory Built-in Options:
| CATALOG NO. | OPTION DESCRIPTION | ||
 | D | Disconnect Switch | Factory installed on the unit heater above the control enclosure. This is an inexpensive and positive way to meet NEC/CEC requirements for a disconnecting means within sight of the heater. |
 | E | Group E (Metal Dust) Construction | Class II, Group E (Metal Dust) Construction Temperature Code T3C, 320° F (160°C). |
| K | “Warning” Pilot Light | Indicates when the thermal cutouts have tripped and the unit heater needs servicing. Not available with combination V & L. |
| L | “Heater On” Pilot Light | Indicates when the electric heating elements are energized. Not available with combination V & K |
| M | Manual Reset Thermal Cutout with Backup Contactor | A pilot duty manual reset thermal cutout with a backup contactor is provided for independent secondary overtemperature protection. Cannot be installed with S, S1 or V. |
| S | Auto/Fan Selector Switch | A two-position switch wired to the control circuit for auto (automatic heat) and fan only control. Cannot be installed with M, V or S1. |
| S1 | Built-In Controls for Remote Auto/Fan Selector Switch | Unit is prewired for field addition of remote auto/fan selector switch. Cannot be installed with M, V or S. |
| T | Adjustable Thermostat | Factory installed and prewired to the control enclosure. Thermostat is adjustable from 50° to 90° F (10° to 32°C). |
| T1 | Adjustable Thermostat for Wet Locations | Factory installed and prewired to the control enclosure. Thermostat is adjustable from 40° to 80° F (5° to 25°C). Can be specified for all constructions. |
| V | 120 Volt Control Circuit | Can be provided when required for special external thermostat circuit. Cannot be installed with S, S1, M or the combination of both K & L together. |
SKU Legend: 
= Popular Products = Extended Offering = Made to Order (Contact your local Marley Sales Representative for typically associated lead times)
Note: Both pilot lights (K & L) are not available with 120V option (V). Only one pilot light can be ordered with 120V control heaters.
Standard Mounting Kits:
| CATALOG NO. | DESCRIPTION |
| 1022451 | Ceiling Mounting Kit |
| 1022454 | Wall Mounting Kit |
| 1022457 | Pole Mounting Kit |
Note: One kit required per heater. Work with all frame sizes
Accessory Remote Thermostats:
| CATALOG NO. | SWITCH TYPE | TYPE | RATING | TEMP RANGE | DESCRIPTION |
| 1007002 | Bimetal | SPDT | 125–277V, 22A | 50°–90°F (10°–32°C) | Class 1, Div. 1, Groups C & D. Class II, Div. 1, Groups E, F, & G |
| QX-1024754 | Bulb and Capillary with Internal Set Point Adjustment | SPDT | 120–240V, 25A 277V, 22A | 40°–120°F (5°–49°C) | Class 1, Div. 1, Groups B, C & D. Class II, Div. 1, Groups E, F, & G |
| QX-1025396 | SPST | 120–240V, 25A 277V, 22A | 40°–120°F (5°–49°C) | Corrosion-Resistant Class 1, Div. 1, Groups B, C, & D. Class II, Div. 1, Groups E, F & G | |
| 1036506 | Bimetal | SPDT | 480V, 15A | 40°–80°F (5°–25°C) | Class I, Div. 1, Groups C & D. Class II, Div. 1, Groups E, F, & G. Class III. IP66, Type 4 |
Remote Fan Switch:
| CATALOG NO. | SWITCH TYPE | RATING | HUBS | DESCRIPTION |
| 1001744 | 2-Position | 120/277V, 30A | (2) 3/4″ NPT Hubs | Class I, Div. 1, Groups C & D. Class II, Div. 1, Groups E, F, & G. Class III |
| 1031042 | 2-Position | 110V, 6A | Class I, Div. 1, Groups C & D. Class II, Div. 1, Groups E, F, & G. Class III. NEMA 4X |
Dimensions and Clearances:
| SIZE | X | Y | Z | MH | MW |
| 1 | 22 1/2″ | 19 3/8″ | 16 1/16″ | 11 1/16″ | 9″ |
| 2 | 22 1/2″ | 23 3/8″ | 20 3/16″ | 15 1/16″ | 7″ |
| 3 | 22 3/4″ | 27 3/8″ | 24 3/16″ | 19 1/16″ | 5″ |
Scan the QR code to access additional specs and features
QMarkMEP.com
Technical Services: 800-642-4328
Item# QFLY_GUX_0725
Documents / Resources
 | QMARK GUX Series Explosion Proof Unit Heater [pdf] Instruction Manual GUX-233-FA-0036C, GUX-233-FA-0036J, GUX-233-FA-0036D, GUX-233-FA-0036K, GUX-233-FA-0036U, GUX-233-FA-0036Z, GUX-233-FA-0056C, GUX-233-FA-0056J, GUX-233-FA-0056D, GUX-233-FA-0056K, GUX-233-FA-0056U, GUX-233-FA-0056Z, GUX-233-FA-0086C, GUX-233-FA-0086J, GUX Series Explosion Proof Unit Heater, GUX Series, Explosion Proof Unit Heater, Proof Unit Heater, Unit Heater, Heater |
 | QMARK GUX Series Explosion Proof Unit Heater [pdf] Instruction Manual GUX-233-FA-0036C, GUX-233-FA-0036J, GUX-233-FA-0036D, GUX-233-FA-0036K, GUX-233-FA-0036U, GUX-233-FA-0036Z, GUX-233-FA-0056C, GUX-233-FA-0056J, GUX-233-FA-0056D, GUX-233-FA-0056K, GUX-233-FA-0056U, GUX-233-FA-0056Z, GUX-233-FA-0086C, GUX-233-FA-0086J, GUX-233-FA-0086D, GUX-233-FA-0086K, GUX Series Explosion Proof Unit Heater, GUX Series, Explosion Proof Unit Heater, Proof Unit Heater, Unit Heater, Heater |