allen MP235, Safety & Operation Manual, Page: 59 / 64

SECTION 3
SERVICE
075765 Page 59
Retardant System - Winterizing
Why Winterize the Retardant System?
If water is allowed to freeze in the retardant system, serious damage to the hose system and the pump
may occur. To prevent freezing in the spray system it is best to completely drain the retardant system
of all water.
Failures of this type will void the warranty of the pump
Do not
use automotive antifreeze to winterize the retardant system.
Antifreeze is highly toxic, and ingestion may cause serious injury or death.
Winterizing the Retardant System Procedure
To properly drain the system perform the following steps:
1. Completely drain the fluid in the retardant tank by disconnecting the hose that is attached to an
outlet on the bottom of the tank. Use an appropriate container to catch the fluid.
2. While the tank’s hose is disconnected, turn the pump ON and allow the pump to purge the water
from the hose system. Then turn the pump OFF.
3. Disconnect all of the hoses that are attached to the pump’s inlet and outlet ports. Then turn the
pump ON, allowing it to operate until all of the fluid is expelled. Turn OFF the pump once all the
water has been expelled. Do not reconnect the hoses at this time.
Be sure to make a note at tank filler as a reminder “Hoses are disconnected for winterizing service.”
All pump and tank ports must be left open to guard against any freeze damage.