Greenheck Temperature Interlock (471738) - Manual (Page 7)

7 Temperature Interlock
Operation
1. Turn fans on and off using the fan switch. It is normal
for the fans to remain running after the switch is
turned off. The exhaust thermostat will open after
heat is no longer present under the hood which will
activate the timer to begin its countdown. Once
time has expired, fans will shut down. The timer is
adjustable from 1-100 minutes. The recommended
time delay setting is approximately 20 minutes.
2. In the event that the cooking equipment is started
without turning the fans on manually, the fans will
turn on automatically and remain running with the
presence of heat under the hood. The exhaust
thermostat will open after heat is no longer present
under the hood which will activate the timer to begin
its countdown. Once time has expired, fans will shut
down.
Testing
1. Turn fan switch on, then off to ensure proper fan
operation before cooking equipment is started. Once
this is verified, testing can proceed.
2. For testing only, locate the time delay relay. Turn the
time adjustment knob counterclockwise to the first
mark in order to expedite the testing process. Make
a note as to where the timer was originally set.
3. Heat up cooking equipment with fans off. Once the
temperature reaches the set point of the thermostat
the fans will start, preferably within 5 minutes. If the
fans take more than 5 minutes to start, decrease
the temperature set point by turning the adjustment
screw 1/16 turn clockwise. Do not apply direct flame
to the thermostat
4. If an adjustment was made in Step 3, repeat now.
5. After verification of fan start-up, shut down cooking
equipment. The fan switch should still be in the off
position. Once cooking equipment has cooled, the
thermostat will open triggering the timer to begin.
Once time has expired, the fans will shut down.
Thermostat operation can be verified by checking
voltage (120V) between T1-B and neutral on either
the control box or KFCC. 120V will be present when
the thermostat senses heat.
6. Once proper operation has been verified, set
the dial on the timer relay to its original setting
(approximately 20 minute delay).
Troubleshooting
Fans do not turn on automatically upon cooking
equipment activation.
•
Check wiring to control panel or relay box,
thermostats must be wired in parallel
• Temperature set point to high, decrease set point
• No power to fans, check breakers/starters/relays
Fans do not shut off.
• Switch must be in the off position
• Cooking equipment hot, wait for it to cool
• Temperature set point too low, increase set point
• Ensure wires connected to appropriate control
circuit
• Time delay too great, turn down timer
Fans do not turn on quick enough.
• Decrease temperature set point
Maintenance
Daily
Clean thermostat with cloth and degreaser. Keep clean
for best performance. (Can clean weekly depending
upon grease accumulation).
Weekly
Dependant on grease production and grease filter type,
clean thermostat.
Seasonal
May have to change temperature setting on back of
thermostat if ambient kitchen temperatures fluctuate
between summer and winter seasons.
Whom to call
Contact your local Greenheck representative.
What to have ready for the call
Sales order, serial number and description of product.
Sales Order Number ________________________
Serial Number ______________________________
CAUTION
The probes should never be exposed to direct flame.
This can cause permanent damage to the probe.
NOTE
During testing, if fans do not start automatically in
the first 10 minutes of cooking equipment activation,
manually start fans to avoid accidental fire system
dump due to heat build-up.
®