Optional Drain Pump Hs-0248; Overview; Drain Pump Check - Hoshizaki C-100BAF Service Manual

E. Optional Drain Pump HS-0248

1. Overview

As ice melts, water drains from the storage bin into DP. When DP's LF/S closes, DP
energizes and pumps out the water. If water cannot be pumped out of DP due to a
blocked discharge hose, bad check valve, or bad DP motor, the water level rises and
UF/S closes. When UF/S closes, DP safety activates and unit shuts down. DP safety
interrupts power to icemaker components until UF/S opens. Power is supplied to DP
motor as long as LF/S is closed.
For schematics, see "III.B.2. Icemaker with Optional Drain Pump HS-0248."
• If you remove DP from the icemaker and/or remove the reservoir cover, be sure to
follow all instructions below. Failure to do so may result in costly water damage.
• DP has an external or internal check valve. If DP contains an internal check valve,
do not install an external check valve and vice versa. See Fig. 6.
Legend: DP–drain pump; LF/S–lower float switch; UF/S–upper float switch

2. Drain Pump Check

If the optional DP (HS-0248) is installed, test its operation at least twice a year as
outlined below. Note that DP has power even when the power switch is in the "OFF"
position.
If DP is not primed or is otherwise not operating properly, it will adversely affect
performance, component life, and warranty coverage and may result in costly water
damage.
1) Move the power switch to the "OFF" position, then unplug the unit from the electrical
outlet. WARNING! To reduce the risk of electric shock, do not touch the power
switch or plug with damp hands.
2) Remove all ice from the storage bin.
3) Plug the unit back in.
4) Slowly pour 16 to 24 oz. (500 to 750 ml) of water over the storage bin drain hole in the
storage bin.
NOTICE
External Check Valve
Fig. 6
NOTICE
30
Internal Check Valve