Initial Starting - Kelvion TEC1 Installation & Maintenance

NUMBER OF DEFROSTS
Initial number of defrost per day depends on a number of factors including ambient humidity, store loading profile, temperature of goods, door opening to load-
ing bay ambient etc.
Start with 3 defrost per day – low usage store in low humidity.
Start with 4 defrost per day – high usage with high ambient humidity.
It is important to review defrost operation on a regular basis to avoid possible damage or loss of performance caused by ice build-up. If ice is not clearing from
the coil reposition the defrost termination probe, increase termination temperature or increase defrosts. If steaming is occurring reduce the number of defrosts
or lower the termination temperature.
TIME OF DEFROST
Defrosting every 6 or 8 hours is not always ideal. Defrosts should be planned at strategic times, before the shift starts, during a break, after a long store
loading period etc. In larger stores with 2 or 3 evaporators all units should be defrosted at the same time – this avoids steam from one defrosting evaporator
being refrozen on an operating unit.
MOISTURE INGRESS
Defrost effectiveness can be improved by reducing moisture ingress into the cold store. Low temperatures inside a cold store reduce the air pressure causing
moist ambient air to be sucked in when the doors are open. To reduce moisture ingress doors opening time should be kept to a minimum, fit air curtains or in high
humidity location fit an air lock or have access to the frozen rooms from chill areas.
LOCATION OF DEFROST TERMINATION PROBE
If a defrost termination thermostat is to be fitted then the normal starting position of the defrost probe is 1/3rd of the way along the coil face (air on) and about
2/3rds up away from any heater elements. Once the system is in operation it may be necessary to relocate the probe to the area of the coil where ice remains the
longest during defrost (possibly air off face)
COIL HEATERS
Coil block heaters are either 'U' bent or straight and they have to be disconnected from the terminal box at the electrical connection end and sometimes from the
auxiliary terminal box at the refrigeration connection end of the cooler. These heaters are withdrawn and replaced from the refrigeration connection end of the
cooler taking care to retain the 'anti-creep' clips.
These clips may be re-used but will possibly need re-tensioning. To avoid damage to either the coil fins or the heater cable, the heater cable should be inserted
into a similar length of 1/4" OD copper tube and fed carefully through the fins with a twisting motion. With care the heater element sheaths can be curved through
90° (minimum radius 24" for removal and refitting purposes. Before attempting to refit a heater, it is essential to ensure that the coil heater hole has not become
obstructed with ice and wherever possible the coil block should be above freezing point.
DRAIN PAN HEATERS
Replacement is achieved by disconnecting the elements from the terminal box(es) after removing the end cover and drain pan, and unclipping/unscrewing the
heater retaining clips.

INITIAL STARTING

Before running the unit for the first time, check that all guards, motor mountings and electrical covers are secure, all unnecessary terminal block links are
removed and fans rotate freely. Remove any lifting channels.
• Check that that the unit is secured in the correct manner. Only fix the unit using the mounting slots provided.
• Check that the fan rotation of 3 phase units is correct. Reversing any two phases of the motor supply will change the rotation (AC fan sets only).