TM 10-6640-238-13 2-50 9 Pump suction drain valve - CLOSED 10   Pump suction valve from water tank bottom - OPEN 11   Main water feed from pump valve - OPEN 12   Water supply chiller valve - OPEN 13   Chiller water return valve - OPEN (c) Place pump controller pump switch to ON.  Pump should run until pressure reaches cutoff point. (d) Open sink faucet to purge air from system.  Pump will start when water pressure drops to starting point. (e) When a solid stream of water is flowing from faucet, close faucet and check system for leaks. (3) Operate Water System Using an Outside Pressurized Source. (a) Open sink and water tank cam drains from under the trailer. (b) Unlatch and open Water Inlet access door. (c) Connect garden hose adapter (1) to water system connector (2). (d) Attach 50-foot (15.25 m) garden hose to garden hose adapter (1). (e) Position WATER OUT/IN valve (3) to IN position. (f) Secure opposite end of hose to pressurized water source. (g) In mechanical room, position water system valves as follows: 1 Input valve prefilter - OPEN 2 Input valve postfilter - OPEN 3 Pump suction or tank fill directional flow valve - OPEN to Tank Fill 4 Water flow direction valve - OPEN to System Input 5 Water tank drain valve - CLOSED 6 Pump suction valve from water tank bottom - CLOSED 7 Water system drain valve - CLOSED 8 Return water drain valve - CLOSED 9 Water pump drain valve - CLOSED 10   Pump suction drain valve - CLOSED 11   Main water feed from pump valve - CLOSED (h) Slowly turn on water supply at source. (i) Open sink faucet and purge air from system. (j) When a solid stream of water flows from faucet, close faucet and check system for leaks. (4) Operate Water System Using an Outside Unpressurized Source. (a) Open sink and water tank cam drains from under the trailer. (b) Unlatch and open Water Inlet access door. (c) Connect garden hose adapter (1) to water system connector (2). (d) Attach 50-foot (15.25 m) garden hose to garden hose adapter (1).