Install Instructions

FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
0
20
40
60
0510 15
20
138
276
414
0.30.630.95
1.3
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
MODEL ZW1070XL (STANDARD & METRIC)
ISZW1070XL (REV. 2/13)
MAINTENANCE
SERVICING THE STRAINERS
The strainers on the inlet supplies can be serviced by loos-
ening the union nuts, removing the valve from service and
clean the screens thoroughly with water after disassembly.
Where water quality is a concern it may be necessary to
install additional line strainers.
SERVICING THE CHECK VALVES
The check valves can be serviced by removing them from
the body. Flush the check valves thoroughly with water
removing debris from the seat and seat washers. Reinstall
the check valve by pushing them into the body ush to
the body, spring rst. Make sure that the poppet and seat
washer is facing you.
OPERATION
The valve internals themself cannot be serviced. If the valve
fails it must be replaced. The function of the valve can be
checked by measuring the temperature of the water at the
outlet nearest to the valve. If the temperature is within +/-
4°F of the initial set temperature, the valve is functioning
correctly. If the temperature has changed by more than +/-
4°F it is likely due to a build up of debris in the stainers or a
change in the supply condition.
FLOW CHARACTERISTIC
Removing Cap Temperature Adjustment
XL
XL
WILKINS, a ZURN company
1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
a company
®
®
TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
The desired mixed water temp. cannot be
obtained or valve is difcult to set
Hot and cold supplies are reversed, valve
is full of debris or strainers are fouled
Ret valve so H & C are correct, ush
valve with water and clean strainers
Mix. Temperature is unstable Strainers are fouled or uctuating supply
pressure
Clean strainers and Install PRV's on
H & C inlet supplies
Mix Temperature changing over time Fluctuating supply pressures or strainers
are full
Install PRV's and clean strainers
Either full Hot or Cold water owing Valve is set incorrectly Adjust mix. Temperature to 95-115°F
No flow from the valve outlet Hot or Cold water supply failure or strainers
are fouled
Restore inlet supply & check mix.
Temperature and clean strainers
Flow rate reduced or fluctuating Valve or inlet fitting fouled by debris Check valve and inlet fittings for blockage
Mixed water temp. too Hot or Cold Valve has been tampered with, valve
incorrectly set, or inlet temperatures are
not within specified limits
Re-adjust to required set temp. to ensure
inlet temperatures are within specified
limits
Mixed water temp. does not change
when the temp. adjuster is moved
Hot and Cold supplies are reversed Refit the valve to correct Hot and Cold
Hot water flows into the cold water sys-
tem or vise versa
Check valve is fouled Clean strainers and remove debris
Valve is noisy Water velocity is too high Reduce water velocity
2
MATERIALS
Body Low Lead Bronze, nickel plated
Internal brass Low Lead Brass
Piston Polysufone
Guide Tube Noryl GFN2
Spring & Screen 300 Series Stainless Steel
Seals Nitrile Elastomer
Checks Noryl GFN2