Traffic Signal Cabinet Heater and Fan Installation for Climate Control
Introduction
A traffic signal cabinet contains electronics that fail in extreme temperatures or high humidity. A heater handles cold; a fan handles heat. Together they extend electronics life and prevent false MMU trips caused by condensation. This guide covers the climate control options.
Heater Function
The cabinet heater maintains a minimum temperature inside the cabinet, typically 5-10°C above ambient. This prevents:
- Condensation on cold electronics during diurnal cycles
- LCD display failure at very low temperatures
- Battery capacity loss in cold climates
GAOQIAO cabinets ship with a 100-200 W heater as standard, controlled by a thermostat set to 5°C. The heater draws power from the cabinet supply.
Fan Function
The cabinet fan removes heat generated by the controller, conflict monitor, and power supply. Without a fan, the internal temperature can exceed the operating limit in summer, especially in a sun-exposed cabinet.
GAOQIAO cabinets ship with a 30-60 CFM fan, controlled by a thermostat set to 35°C. The fan draws filtered air from outside the cabinet through a dust filter.
Combined Operation
In temperate climates, the heater and fan operate seasonally: heater in winter, fan in summer. In extreme climates (tropical, arctic), both may operate in the same day.
GAOQIAO thermostats are independently adjustable and shipped with sensible defaults for the destination climate.
Filter Maintenance
Cabinet filters are the most overlooked maintenance item. A clogged filter causes:
- Reduced airflow, higher internal temperature
- Dust ingress on electronics
- Fan motor failure from overwork
Inspect filters monthly during the dusty season, quarterly otherwise. Replace when visibly dirty or every 6-12 months.
Solar Cabinets
For solar-powered traffic signals, heater and fan loads must be included in the daily load calculation. GAOQIAO solar controllers can be configured to disable the heater when the battery is below 50% state of charge, preserving runtime for the signal heads.
Featured Products
GAOQIAO supplies cabinets with heater and fan for any climate. See the controller cabinet guide.
Conclusion
A cabinet heater and fan are not optional in extreme climates. GAOQIAO supplies complete climate control in every cabinet. Send us your site climate for a heater/fan sizing recommendation.
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Frequently Asked Questions
How much power does the heater use?
100-200 W continuous when active. In a cold climate, that can add 30% to the cabinet power budget.
Can I run a cabinet without a fan in cold climates?
Yes, if the internal temperature never exceeds 50°C. In sun-exposed cabinets in hot climates, the fan is essential.
What thermostat settings are best?
Heater on at 5°C, off at 15°C. Fan on at 35°C, off at 25°C. The dead band prevents rapid cycling.
Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.
- Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
- LED traffic signal heads200mm, 300mm and 400mm signal heads with MUTCD, EN12368, GB14886 compliance.
- Signal polesVertical, signal arm and double-arm poles for any intersection geometry.
- Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.