922 Series Cabinet Unit Heater
The electric cabinet unit heaters shall be as manufactured by Heatrex. Heaters shall be UL/cUL Listed, designed for mounting in any position, including on-end, fully recessed, semi-recessed or surface mounted. All capacities, voltages, physical sizes should be as specified in the heater schedule. All three phase heaters shall have a balanced heating load. Control voltage is to be internally generated by 24 VAC (Optional 120 VAC).
Contemporary Aesthetics
- Contemporary design to match modern and future architect specifications
- Standard louvered grille with optional ducted grilles
Easy Install and Maintenance
- One-person maintenance on ceiling applications with hinged front panel
- Front cover interlock de-energizes unit when front cover is removed for added safety
- Disposable air filter mounted in inlet air stream; optional permanent and washable aluminum filters available
Robust Design
- Cabinet constructed of heavy 16-gauge cold-rolled steel to provide strength and finished with a polyester powder coating for corrosion resistance
- Motors are mounted with automatic thermal overload protection; motor fuse protection is provided on all heaters to meet safety requirements
- Comes standard with two thermal safety cutouts to automatically shut off and protect the heater in the event of overheating. Reactivates the heater when operating temperature returns to normal
Approvals
Standard Features
CABINET: The cabinet shall be of heavy duty cold-rolled steel. The heater front covers shall be securely attached to the cabinet with a maximum of two slotted head style spring latches (optional Toolhead Key Lock) and easily removable for access to elements, filters and control panel. Cabinet shall be finished in Beige (Optional – Color by Architect) polyester powder coated.
HEATING ELEMENTS: The heating elements shall be warranted for five years and shall be of non-glowing design consisting of 80/20 NiChi resistance wire enclosed in a steel sheath to which steel plate fins are brazed. The heating element shall be located directly in front of the blower discharge air for uniform heating.
SAFETY THERMAL CUTOUTS: Thermal safety cutouts shall be built into the system to automatically shut off heater in event of overheating due to any cause. The safety cutouts shall directly interrupt power to the elements and not depend on relays to interrupt the power. (Optional backup manual reset thermal safety cutout in the control circuit shall prevent heater reenergizing until cause of overheating has been cleared by a qualified service technician).
MOTOR AND BLOWER ASSEMBLY: The motor(s) and blower(s) shall be direct drive and resiliently mounted on a rigid heavy duty frame for quiet operation and long life. The motor(s) shall be two speed 1/8 H.P. with automatic reset overload protection. The motor shall be vented and mounted in the air stream to provide maximum cooling of the motor(s). Motor(s) fuse protection shall be provided to meet UL, cUL and NEC requirements. The blower(s) shall be forward curved, double inlet, centrifugal type with discharge directly on the full length of the elements to provide uniform discharge air temperatures.
AIR FILTERS: The filter shall be located ahead of the motor and blower assembly to ensure clean air circulation. The filter shall filter both the returning room or the outside air if the optional outside air damper assembly is provided. Filter shall be easily removed for changing or cleaning by removing the front panel and pulling on the filter. A disposable filter is standard and a permanent washable filter is optional.
FRONT COVER INTERLOCK: Heater shall be provided with an electrical interlock to shut down the heater when the front cover is opened to provide safety to the maintenance personnel during filter cleaning (replacement) or other maintenance.
FAN DELAY CONTROL: Fan control shall delay start up of the fan motor(s) until the heating elements have warmed up. It shall maintain motor operation after heating elements have been de-energized to dissipate residual heat.
TEMPERATURE CONTROL: Thermostat shall be built-in, snap-action single stage with remote bulb sensor located in the return air stream. (Optional – built-in two stage remote bulb snap action thermostat, remote mounted single stage wall thermostat). Terminals shall be provided in the control panel for direct connection of the remote wall mounted thermostats. Silent time delay relays shall be provided, rather than contactors, to eliminate the noise of contactor opening and closing.
TERMINALS FOR REMOTE INTERLOCK: Terminals shall be provided in the control panel for connection to Building Automation or Energy Management Systems.
HEAT SELECTION/FAN SPEED: Two fan speeds and high-low heat ranges shall be selectable by means of a single rocker switch located behind the front cover.
CIRCUIT BREAKERS: Circuit breakers shall be provided for branch circuit protection where required by UL, cUL and NEC (Optional – Circuit breakers shall be supplied on all heaters).
INTERCHANGEABLE INTAKE AND DISCHARGE LOUVERS: Heater shall be provided with intake louver that can be changed from front to bottom by removing a maximum of two screws. Discharge louvers shall be able to be changed from front to top by removing a maximum of two screws.
The Following Factory Installed/Prewired Optional Equipment Shall Be Supplied:
- Manual Reset Thermal Cutout
- Circuit Breakers
- 120 Volt Control Supply
- Dead Front Disconnect Switch
- Dead Front Fused (Non Fused Disconnect Switch & Circuit Breaker)
- Disconnect Switch
- On-Off Switch
- Inlet/Discharge Duct Collars
- Permanent (Washable) Filter
The Following Field Installed Optional Equipment Shall Be Supplied:
- Recess Trim Kit
- Base Kit
- Washable Filter
Technical Specifications
- Temp Range: 55°–85°F
- CFM: 500–1000
Applications
- School Hallways
- Churches
- Transportation Terminals
- Lobbies
- Stairwells
- Entrance Ways
- Vestibule
- Mechanical Rooms
