Service manual

Electrical System Section 6
6-2
Part No. 80-1206-3
Energized Parts Charts
Q1400C
*Low Pressure Control (close on pressure increase).
1. Initial Start-Up or Start-Up After Automatic Shut-Off
2. CVD1375/CVD1475 ONLY - The fan motor is wired through a fan cycle pressure control, therefore, it may cycle on and off.
Safety Timers
The control board has the following non-adjustable safety timers:
Freeze Sequence:
• The ice machine is locked in the Freeze Sequence for the first 6 minutes, not allowing the Ice Thickness Probe to
initiate a Harvest Sequence.
• The maximum freeze time is 60 minutes, at which time the Control Board automatically initiates a Harvest
Sequence.
Harvest Sequence:
• The maximum harvest time is 3.5 minutes, at which time the Control Board automatically terminates the Harvest
Sequence. If the Bin Switch is open, the ice machine will go to Automatic Shut-Off. If the bin switch is closed, the
ice machine will go to the Freeze Sequence.
Ice Making
Sequence Of
Operation
Control Board Relays Condensing Unit
Length
Of Time
1 2 3 4 5 LPC* Contactor
Water
Pump
Cool Vapor
Valve
(Right)
Cool
Vapor
Valve
(Left)
Water
Dump
Valve
Liquid
Line
Solenoid
Valve
Contactor
Coil
Compressor/
Condenser
Fan Motor
START-UP
1
1. Water Purge
On Off Off On Off Open Off 45 Seconds
FREEZE
SEQUENCE
2. Pre-Chill
Off Off Off Off On Closed On
2
30 Seconds
3. Freeze On Off Off Off On Closed On
2
Until 7 sec.
water contact
with ice
thickness
probe
HARVEST
SEQUENCE
4. Water Purge
On On On On On Closed On
2
Factory-set at
45 Seconds
5. Harvest Off On On Off On Closed On
2
Bin switch
activation
6. AUTOMATIC
SHUT-OFF
Off Off Off Off Off Open Off
Until bin switch
re-closes