QMARK GUX SERIES EXPLOSION-PROOF UNIT HEATER

CAPACITIES

• 2.5-35 kW
• 208-600V
• 10 or 30
• Thermostat Range: 50°-90° F
• Air Volume: 550-3850 CFM
• Air Throw Range: 13-75 feet
• Class 1, Divisions 1 & 2, Groups C & D
• Class II, Divisions 1 & 2, Groups F & G
• Class 1, Zones 1 & 2, Groups IIB
• Ignition Temperature Code T3C, 320° F
• See Selection Chart for Options

JOB INFORMATION

JOB NAME:

LOCATION:

ARCHITECT:

ENGINEER:

CONTRACTOR:

SUBMITTED BY:

DATE:

HEATER SPECIFICATIONS

ACCESSORIES AND CONTROLS

APPROVALS

SUBMITTED BY:

DATE:

APPROVED BY:

DATE:

ARCHITECT'S AND ENGINEER'S SPECIFICATIONS*

Electric explosion proof unit heater(s) shall be supplied by QMark, a Marley Engineered Products® Brand, Bennettsville, SC, USA, and shall be of the KW rating, voltage and phase specified in the schedule. They shall be fan-forced type, certified to cCSAus, and approved for Class I, Divisions 1 and 2, Group C and D; Class II, Divisions 1 and 2, Groups E, F and G; Class I, Zones 1 and 2, Group IIB; Temperature Code T3C, 320°F (160°C).

SAFETY:

Unit heaters shall be outfitted with dual overtemperature production—both a manual and automatic reset thermal cutout.

HEAT EXCHANGER:

Efficient liquid-to-air design utilizes an all welded steel headers and finned tube construction with spiral wound aluminum fins. Industrial grade heating elements are immersed in a nontoxic, inhibited, propylene glycol heat transfer fluid that provides freeze protection down to -49°F (-45°C). The heat exchanger is hydrostatically tested at 350 psig. A pressure relief valve provides excess pressure protection and is set at 70 psig.

ENCLOSURE:

Heat exchanger and components to be enclosed in an industrial grade, corrosion-resistant cabinet fabricated from polyester powder-coated, 14 gauge steel. Adjustable outlet louvers to have minimum opening safety stops.

FAN MOTOR ASSEMBLY:

Unit heaters consist of an explosion-proof motor (60hz standard, 50hz optional) fitted with an aluminum fan blade. The motor has double shielded, permanently lubricated ball bearings and automatic reset line breaking thermal overload protection. Motors furnished on standard units operate at line voltage and are prewired to the control enclosure so separate field wiring to the motor is not required. The standard motor is rated for Class I, Groups C and D, Class II, Groups F and G. The minimum operating temperature is -14°F (-25°C) and the minimum storage temperature is -49°F (-45°C). Optional motor ratings available.

MOUNTING:

The heater shall be provided with an accessory mounting kit designed to bear the weight of heater assembly. Options include a ceiling mounting kit, wall mounting kit, or a pole mounting kit.

OPTIONAL BUILT-IN CONTROLS:

Units come standard with a controlling magnetic contactor and 24 Volt control circuit transformer housed in a NEMA 7, 9 cast aluminum enclosure. The following factory installed and prewired control options are available: adjustable built-in thermostat, disconnect switch with external handle, fan only switch, 120 Volt control circuit for special external thermostat circuit, “warning” pilot light (to indicate abnormal operation), “Heater On” pilot light.

*QMark reserves the right to change specifications without prior notice.

GUX SERIES 60 Hz Models & Specifications:

*Total Amps = Heating element and motor amps. **Approximate air temperature rise

GUX SERIES 50 Hz Models & Specifications:

*Total Amps = Heating element and motor amps. **Approximate air temperature rise

Factory Built-in Options:

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:

Note: One kit required per heater. Work with all frame sizes

Accessory Remote Thermostats:

Remote Fan Switch:

Dimensions and Clearances:

Side View

A diagram showing the side view of the unit heater with dimensions labeled X, MH, and clearance indicators.

Front View

A diagram showing the front view of the unit heater with dimensions labeled Y, Z, and clearance indicators.

Ceiling Mounting Kit

A diagram illustrating the ceiling mounting configuration with a unit heater suspended from the ceiling, showing clearances.

Wall Mounting Kit

A diagram illustrating the wall mounting configuration with a unit heater attached to a wall, showing clearances.

Pole Mounting Kit

A diagram illustrating the pole mounting configuration with a unit heater attached to a pole, showing clearances.

How to Order

Example: GUX-233-F-A-010-6-U-DKS-00

• Brand: GUX
• Series: 233 = Unit Heater, Explosion Proof
• Agency Approval: F = cCSAus Approval (standard), N = No Approval
• Cabinet Size: A = Size 1, 12" Fan, 0-10 kW, B = Size 2, 16" Fan, 10.1-20 KW, C = Size 3, 20" Fan, 20.1-35 KW
• kW*: 003, 005, 008, 010, 015, 020, 025, 030, 035
• Temperature Rating: 6 = T3C Temperature Rating
• Voltage & Phase:
  • Standard Offering-60Hz: C = 208V/1, D = 208V/3, J = 240V/1, K = 240V/3, U = 480V/3, Z = 600V/3.
  • Additional/Special Offering-60Hz: A = 115/1, B = 120/1, E = 220/1, F = 220/3, G = 230/1, H = 230/3, I = 347/1, N = 277/1. O** = Special, Q = 440/3, S = 460/3, X = 575/3.
  • Standard Offering-50Hz***: E = 220/1, F = 220/3, G = 380/3, H = 400/3, I = 415/3.
• *Round up to the nearest whole kW
• **For custom requests, contact Marley sales representative for assistance and additional detail
• ***Option Code "H" indicates 50 Hz Heater
• Contact Marley Sales Representative for additional configuration details
• Product Serial Code**: Factory Install Options: D = Disconnect Switch, E = Group E (Metal Dust) Construction, K = "Warning" Pilot Light, L = "Heater On" Pilot Light, M = Manual Reset Thermal Cutout with Backup Contactor, S = Auto/Fan Selector Switch, S1 = Built-In Controls for Remote Auto/Fan Selector Switch, T = Adjustable Thermostat, T1 = Adjustable Thermostat for Wet Locations, V = 120 Volt Control Circuit, W = Wet Location Construction Features - IP55

About Marley Engineered Products

No matter the industry or application, Marley Engineered Products has a robust portfolio of innovative, reliable, high-performance comfort heating and ventilation solutions for all your heating needs. For more information or assistance on your next project, contact Technical Services at 800-642-4328.