Mueller HYDRO GUARD HG-11 Standard, User'S Operation Manual

Page: 18 / 28

Page 18 of 28
A. Battery Replacement
1. HG-11 Standard Unit (Removable Controller)
a. Use HG-A2023 Security Tool to unlock and remove protective Exterior
Housing Cover.
b. Unscrew protective cap from gray Programming Interface, which is located at
top of unit.
c. Extract battery harness and remove old battery (dispose of battery appropriately).
d. Connect fresh industrial grade 9-volt lithium or alkaline battery and reinsert it
with harness into Programmer.
e. Screw protective cap back into place and hand tighten securely.
f. Use Handheld Controller to reset all programs and assure flushing sequence is
correct prior to returning the HG-11 Unit to service.
g. Reinstall Exterior Housing Cover and restore water supply to unit.
2. HG-11 Signature Unit (Built-In Node Controller)
a. Follow steps 1a through 1c to access on-board Programmer as above.
b. Connect fresh industrial grade 9-volt alkaline battery and reinsert it with harness
into Programmer (an optional battery harness is provided for redundancy and
extended battery life)
c. Screw protective cap back into place and hand tighten securely.
d. Confirm that desired flushing sequences are correct prior to returning the HG-11
Unit to service.
e. Reinstall Exterior Housing Cover and restore water supply to unit.