PHW/PHWS SERIES PRESSURE WASHER
OPERATOR’S MANUAL
10
During the winter months, when temperatures drop below
32° F, protecting your machine against freezing is neces-
sary. Siphoning a small amount of antifreeze into the sys-
tem is recommended. This is done by pouring a 50/50 mix
of antifreeze and water into the float tank and then si-
phoning 100% antifreeze through the chemical line with
the pump on. If compressed air is available, an air fitting
can be screwed into the float tank strainer fitting and, by
injecting compressed air, all water will be blown out of the
system.
Low Pressure Diagnosis:
Refer to the low pressure section of the troubleshooting
guide. If, by referring to the guide, the trouble is found to
be either the unloader or pump, your next step is to deter-
mine which is the problem. This can be done by eliminat-
ing the unloader from the system and attaching the dis-
charge hose directly to the pump. If high pressure is
present, then the unloader needs repairing.
CAUTION:
WHEN USING THIS PROCEDURE TO TEST
COMPONENTS, KEEP SPRAY GUN OPEN AT ALL
TIMES.
Coil Removal:
Removal of the coil because of freeze breakage or to clean
soot from it, can be done quickly and easily.
1. Disconnect hose from pump/unloader to inlet side of
coil.
2. Disconnect the electrical connections to the thermo-
stat or remove thermostat sensor.
3. Remove all the fittings from the discharge and inlet
side of the coil.
4. Remove the burner assembly from the combustion
chamber.
5. Remove 3 - 3/8" bolts from either side of coil and tank
assembly (these bolts are used to fasten tank and
handles to chassis).
6. Remove the two 3/8" nuts which are underneath the
bottom wrap (to keep the coil from moving).
7. Remove tank top wrap exposing insulation and coil.
Carefully bend insulation tabs at exhaust stack.
8. Carefully fold back the insulation and remove the coil.
9. Replace or repair any insulation found to be torn or
broken.
10. Reinstall new or cleaned coil by reversing steps 8
through 1.
Temperature and Pressure Relief Valve:
(Pump Protector)
Machines with spray gun control offer the operator the
convenience of stopping and starting the flow of water at
the end of the discharge hose. When the spray gun stops
the flow of water, the unloader valve, back at the machine,
opens and recycles the cold water back to the inlet side of
the pump. Recycling for longer than five minutes causes
the cold water within the pump to heat up. To avoid dam-
age to the pump, a temperature and pressure relief valve
is installed next to the inlet side of the pump that will open
in the event the water temperature exceeds 140° F. There-
fore, while operating the machine, do not leave the spray
gun closed for an extended period of time.
High Limit Hot Water Thermostat:
For safety, PHW machines are equipped with a high limit
snap switch and PHWS machines are equipped with ad-
justable thermostats. In the event the temperature of the
water should exceed its operating temperature, the high
limit snap switch or adjustable thermostat will turn the
burner off until the water cools, then it will automatically
reset itself.
Rupture Disk:
If pressure from pump or thermal expansion should ex-
ceed safe limits, the rupture disk will burst, allowing high
pressure to be discharged through hose to ground. When
the disk ruptures, it will need to be replaced. Torque re-
placement disk to 35 lbs.
AUTO START / STOP
TIMER OPERATION
Once the pump switch is turned on, simply triggering the
spray gun is all it takes to start the machine. Once the
trigger is released the timer will let the machine bypass
water for 15 seconds. It also starts an internal 5 to 60
minute lockout timer. This feature is totally adjustable by
the operator by adjusting the knob at the top of the timer.
We recommend setting the timer for 15 minutes. To reset
the lockout feature, operator must trigger the spray for 10
full seconds.
TROUBLESHOOTING
To by-pass unloader pressure switch, remove wires on
C
and
NO, jumper same positions on timer.
To by-pass the timer, jumper wires on timer positions
C
and
6 together.