Service Manual
Table Of Contents
- Important Safety Information
- I. Construction and Water/Refrigeration Circuit Diagram
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- A. Control Board
- B. Controls and Adjustments
- 1. Default Dip Switch Settings
- 2. BC1 (Infrared Sensor) Shutdown Delay (S1 dip switch 1, 2, 3)
- 3. Drain Frequency Control (S1 dip switch 4)
- 4. Continuous Dispensing Timer (S1 dip switch 5 & 6)
- 5. Bin Control Selector (S1 dip switch 7)
- 6. BC2 (Mechanical Backup) Shutdown Delay (S1 dip switch 8)
- 7. Shutdown Sequence (S1 Dip Switch 9)
- 8. Alarm Selection (S1 Dip Switch 10)
- IV. Refrigeration Circuit and Component Service Information
- V. Maintenance
- VI. Disposal
- VII. Technical Information
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10) Rell Cycle – "GM", "COMP", and "WTRIN" LEDs are on.
LFS opens. WVenergizes and FT starts. GM, CCR, EH, PDS, MC, Comp, and FMR
continue. LFS closes. Nothing occurs at this time. Reservoir continues to ll until UFS
closes. When UFS closes, WV de-energizes, 90-sec. FT terminates, and 30-sec. FZT
starts. IfUFS remains open longer than 90-sec. after LFS opens, FT exceeded and
CB sounds a 1-beep alarm. WVremains energized until UFS closes. Alarm resets
automatically when UFS closes.
Diagnosis – Conrm that the water level has dropped and the UFS and LFS are open.
See "II.F.1. Float Switch Check." Check that "WTRIN" LED is on. IfLFS is open and
"WTRIN" LED is off, replace CB. If "WTRIN" LED is on, check that the reservoir lls.
Ifnot, check water supply line shut-off valve, water lters, and WVscreen. If"WTRIN"
LED is on and WV is off, check CB K2 #8(O) to a neutral (LBU) for 24VAC. If 24VAC is
not present, check CB K2 #9(W/R) to a neutral (LBU) for 24VAC. If 24VAC is present
on CB K2 #9 (W/R)and not on CB K2#8 (O), replace CB. If 24VAC is present on
CB K2#8(O),check continuity through WV solenoid. If open, replace WV. If WV is
energized and rell exceeds FT with no water in the reservoir, check for DV leaking. If
reservoir is full and overowing check for open UFS. See "II.F. Float Switch Check and
Cleaning." If UFS is closed, check that WVde-energizes. If not, check CB K2 #8 (O)
to a neutral (LBU) for 24VAC. If 24VAC is present, replace CB. If WV de-energizes and
water continues to ll the reservoir, replace WV.
Note: Each time UFS closes, 30-min. freeze timer starts. The 30-min. freeze timer
resets when UFS closes again. If UFS does not close again within 30-min., CB
shuts down the unit and sounds a 5-beep alarm every 5 sec.
See "III.A.2 LED Lights and Audible Alarm Safeties."
FT: 90-Sec. Low Water Safety Timer – When LFS opens, 90-sec. low water safety
timer starts. If UFS does not close within 90 sec. after LFS opens (FTexceeded),
CBsounds a 1-beep alarm and a 90-sec. shutdown cycle starts.
See "III.A.2.LED Lights and Audible Alarm Safeties." PDS de-energizes. Refrigeration
circuit low-side pressure drops to 9PSIG, opening CLPS. CLPS opens, de-energizing
MC, which de-energizes Comp and FMR. GM, CCR, and EH continue. 90-sec. purge
timer terminates. GM, EH, and CCR de-energize. WV and 1-beep alarm continue until
UFS closes.