Electric interlocks are used to increase safety levels for both refuse and linen
chutes. Though not a general requirement they improve and enhance the operation of
Electric interlocks can be fitted to all Hardall hoppers and linen chute doors.
The electric circuit can be linked to a building management system including smoke
and fire detectors. Pre-set time delays are also normally specified for hospital
linen chutes to minimise air movement within the chutes and between ward floors.
This reduces the risk of cross contamination.
1. Locks all doors or hoppers when the automatic chute cleaning system is
in operation, thus preventing refuse falling on top of the brush sweep.
2. Allows use of only one door or hopper at a time, giving greater user safety.
3. Locks off all doors and hoppers in response to smoke detectors or to customer
4. Minimises air movement within the chute.
Power Supply & Specification
Electro-magnetic solenoid bolts for linen chute doors, push button to open, doors normally
Electro-magnetic latch lock for refuse chutes, doors normally unlocked.
12/24 volts 50/60Hz, 10Amps max.
Pre-set timer delay on/off, range 5/200 sec.