ZURN ZW3870XLT Aqua-Gard Thermostatic Mixing Valve Instruction Manual
- June 9, 2024
- ZURN
Table of Contents
ZURN ZW3870XLT Aqua-Gard Thermostatic Mixing Valve
This product contains a weighted average lead content of less than 0.25% for wetted surfaces.
INSTALLATION INSTRUCTIONS
It is suggested that the device be installed to deliver water to the end user. It is to be used for the final control of water temperature at plumbing fixtures and appliances. This ASSE 1070-approved device is to be used for point of use. It is designed to mix cold water and hot water from the water heater to a safer temperature range of 95-115°F (35-46°C).
- Flush the Hot and Cold delivery lines completely before installing the device.
- The device can be installed in any position. Note: the inlet hot supply is to be connected to the “H” side of the valve and the cold supply side to the “C” side.
- The valve is to be fitted to deliver mixed water to a single outlet.
- To set the temperature on the valve remove the protec-tive blue cap. The cap can be removed by inserting a small blade screwdriver into the slot at the base of the blue cap and lightly pushing up. Using an adjustable wrench or combination wrench, rotate the flats clockwise to lower the temperature or counter-clockwise to increase the set temperature. Read the temperature with a thermometer.
- Verify the set temperature by running a plumbing fixture and reinstalling the protective plastic cap to the device. For bathroom operation set the maximum temperature not to exceed 95-115°F (35-46°C).
PERFORMANCE
- Outlet Temp. Range 95-115°F(35-46°C)
- Temperature Hot Supply 120-195°F max. (49-90.5°C)
- Temperature Cold Supply 40-75°F (4.4-23.8°C)
- Set Temperature Accuracy +/- 3°F(1.78°C)
- Max. Working Pressure (inlet) 145 psi
Temperature must be field set
- Max. Working Pressure (Dynamic) 1.5-70 psi
- Flow rate @ 45 psi pressure loss 3.10 gpm
- Min. Flow Rate* 0.06 gpm
Max. Pressure Differential is 15 psi between Hot & Cold inlets With a minimum
flow rating of 0.06 GPM the valve will provide proper scald protection when
used in conjunction with ultra-low flow faucet aerators.
PIPING INSTRUCTIONS
The device is designed to be installed at a single outlet. It may be used to supply individual outlets when there is sufficient supply pressure. It is suggested to use ball valves on the Hot and Cold inlet supplies.
CAUTION:
Installation of water temperature control products must be performed by
qualified, licensed personnel. The qualified installer should be sure that the
proper device has been selected for the proper installation. A faulty
installation can cause scalding, severe injury, or death.
NOTICE:
Annual inspection and maintenance are required of all plumbing system
components. To ensure proper performance and maximum life, this product must
be subject to regular inspection, testing, and cleaning.
WARNING!
Water Temperatures in Excess of 122°F(50°C) Are Dangerous and Will Cause
Scalding, Severe Injury, or Death! This valve is Not Factory preset. To
deliver a safe mixed water temperature at the outlet, the installer must use a
thermometer at the outlet to verify the temperature. Set the outlet
temperature between 95°F and 115°F.
DIMENSIONS
SIZE
| ****
MODEL
| DIMENSIONS (approximate)| ****
WEIGHT
---|---|---|---
A| B| C| D| E| F
in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| in.| mm| lbs.| kg.
3/8| 9.5| ZW3870XLT| 4 13/16| 122.2| 4 17/32| 115| 6| 152| 1| 25.4| 3| 76.2| 2
5/8| 66.7| 1.5| .68
With supplied check valves. Note: check valves must be used for proper operation.
WARRANTY
ZURN WILKINS Valves are guaranteed against defects of material or workmanship when used for the services recommended. If in any recommended service, a defect develops due to material or workmanship, and the device is returned, freight prepaid, to ZURN WILKINS within 12 months from the date of purchase, it will be repaired or replaced free of charge. ZURN WILKINS’ liability shall be limited to our agreement to repair or replace the valve only.
- WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.
MATERIALS
- Body Low Lead Bronze, nickel plated
- Internal brass Low Lead Brass
- Piston Polysufone
- Guide Tube Noryl GFN2
- Spring 300 Series Stainless Steel
- Seals Nitrile Elastomer
- Checks Delrin
COMPRESSION FITTING INSTALLATION
It is recommended that the end of the inlet supply tube, tee fitting, or
90-degree elbow extend 1/16″ beyond the ferrule for adequate compression as
illustrated above in Figure 1.
MAINTENANCE
SERVICING THE CHECK VALVES
The check valves can be serviced by removing them from the body, flushing the
check valves thoroughly with water removing debris from the seat and seat
washers. Reinstall the check valve by pushing them into the body flush with
the body, spring first. Make sure that the poppet and seat washer are facing
you.
OPERATION
The valve internals themselves 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 +/-3°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 strainers or a change in the supply condition.
FLOW CHARACTERISTIC
MODEL ZW3870XLT, ZW3870XLT-4P
TROUBLESHOOTING
| Problem | Cause | Solution |
|---|
The desired mixed water temp. cannot
be obtained or valve is difficult to set
| Hot and Cold supplies are reversed, valve is full of debris.| Refit valve so
H & C are correct, flush valve with water
Mix Temperature is unstable| Fluctuating supply pressure| Install PRV’s on H &
C inlet supplies
Mix Temperature changing over time| Fluctuating supply pressures| Install
PRV’s
Either full Hot or Cold water flowing| Valve is set incorrectly| Adjust mix.
Temperature to 95-115°F
No flow from the valve outlet| Hot or Cold water supply failure| Restore inlet
supply & check mix. Temperature
Flow rate reduced or fluctuating| Valve or inlet fitting fouled by debris|
Check valve and inlet fittings for block- age
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| Remove debris
Valve is noisy| Water velocity is too high| Reduce water velocity
Little or no flow from valve outlet| Inlet supply tube extending more than
1/16″ beyond ferrule| Shorten tube then remove and replace inlet check valves
Little or no flow from valve outlet| Inlet screens plugged with debris| Clean
inlet screens
ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone:
855-663-9876 Fax:
805-238-5766.
www.zurn.com
Patent zurn.com/patents.