Ice Level Control; Refrigeration System Adjustments; Expansion Valve; Adjustment And Troubleshooting - Cornelius IMD300-15A Installation Manual

I L C
CE EVEL ONTROL
The ice level control assembly is secured to the top of the ice storage container cover. The cover is secured to the
storage container with four screws. The level control switch is operated by a plate assembly located beneath the
diaphragm. When the plate assembly is down due to lack of ice in storage container, electrical impulse is sent to
compressor, starting the ice making cycle. As ice level increases in storage container, the plate assembly is pushed
up. When storage container is full, it de-actuates the switch, stopping the compressor and ice making cycle.
The operating positions of the switch are fixed, no adjustments are necessary. If switch replacement becomes nec-
essary, simply disconnect cable at connector, remove wires from switch.
R S
EFRIGERATION
A complete understanding of the icemaker and hermetic refrigeration system is necessary before any adjustments
are made. The refrigeration technician must use high and low side pressure readings, water, and air temperatures,
plus general conditions of cleanliness to assess the refrigeration system status when making any adjustments.
All icemaker products are tested and adjusted at the factory prior to shipment where the ambient temperature
ranges from 65°F to 90°F, depending on the season of the year.
Whenever a new icemaker is initially installed and started-up, it is imperative that the start-up operator make the fol-
lowing checks and readjustments for local conditions.

Expansion Valve

You will find a thermal expansion valve on icemakers, which is used to control the amount of refrigerant flowing
through the evaporator. Improperly installed or defective expansion valves may cause low production, soft ice,
squeaking from evaporator and excessive load inside evaporator.
By using general refrigeration troubleshooting along with the pressure charts, you can easily determine whether or
not the expansion valve is working properly.
A
DJUSTMENT AND
When troubleshooting the expansion valve, you must:
1. Be sure you have adequate water flowing into the evaporator, a clean and properly ventilated condenser, and
the system is properly charged and free of any restrictions. Also be sure compressor is operating properly.
2. Take reservoir water temperature and air temperature from condenser inlet and determine at what pressure
unit should be running. On machines equipped with thermostatic valve there is NO adjustment. If correct pres-
sure cannot be obtained, be sure system has time to stabilize, 10-15 minutes.
3. Be sure sensing bulb is located at outlet side of evaporator about 3-4 inches away from evaporator and be sure
to insulate well and clamp tightly to tubing. If system pressures are still not adequate, take a second water and
air temperature reading and go over other parts of the system for possible problems. If proper charge is ques-
tionable evacuate and recharge to nameplate and leak check. If valve still malfunctions replace valve.
Use general refrigeration system practices when replacing and recharging unit. After new valve is in place, go
through previous monitored adjustments and troubleshooting to be sure valve is functioning properly.
NOTE: On water cooled units adjust condenser modulating valve before troubleshooting expan-
sion valve.
!
CAUTION:
Very high discharge pressure is present in system. Quick disconnects on your gages will minimize Danger and loss of
refrigerant. Comply with federal regulations for reclaiming refrigerant.
© 2004-2012, IMI Cornelius Inc.
A
YSTEM DJUSTMENTS
T
ROUBLESHOOTING
Countertop Icemaker IMD Series Installation Manual
- 11 - Publication Number: 638085277INS