ZURN ZW3870XLTF Aqua-Gard Thermostatic Mixing Valve Instruction Manual
- June 10, 2024
- ZURN
Table of Contents
ZURN ZW3870XLTF Aqua-Gard Thermostatic Mixing Valve
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/ASME A112.1070/CSA B125.70 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). This device also features a special thermal flush mode to allow maintenance personnel to flush the downstream system with high-temperature water for disinfection purposes.
- 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 protective green cap. The cap can be removed by inserting a small blade screwdriver into the slot at the base of the green cap and lightly pushing up (See Figure 1). Using an adjustable wrench or combination wrench, unscrew the locknut a couple of turns, then rotate the flats of the stem clockwise to lower the temperature or counter-clockwise to increase the set temperature (See Figure 4). Read the temperature with a thermometer.
- Verify the set temperature by running a plumbing fixture. Tighten the locknut to lock the temperature setting and reinstall 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 0.25 gpm
Max The pressure Differential is 15 psi between Hot & Cold inlets. 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.
ADVERTENCIA: Cáncer y daño reproductivo –
www.P65Warnings.ca.gov.
AVERTISSEMENT: Cancer et néfastes sur la reproduction –
www.P65Warnings.ca.gov.
INDIVIDUALS USE 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. Connections
are 3/8″ compression fittings.
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 is 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
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.
MATERIALS
- Body: Low Lead Bronze, nickel plated
- Internal brass: Low Lead Brass
- Piston: Polysulfone
- Guide Tube: Noryl GFN2
- Spring: 300 Series Stainless Steel
- Seals: Nitrile Elastomer
- Checks: Delrin
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 is 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.
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| ZW3870XLTF| 5 1/2| 140| 4 17/32| 115| 6| 152| 1| 25.4| 3| 76.2| 2
5/8| 66.7| 1.5| .68
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
THERMAL DISINFECTION MODE
Model ZW3870XLTF includes a special thermal flush mode that allows maintenance
personnel to flush the downstream fixtures and piping with high-temperature
water for disinfection purposes.
CAUTION: Note that putting the ZW3870XLTF mixing valve in Thermal Flush
Mode disables anti-scald protection as required by ASSE 1070/ASME
A112.1070/CSA B125.70. Thermal Flush Mode is for use by authorized maintenance
personnel only. Improper use of this mode may result in scalding or other
serious injury. Under no circumstances should the mixing valve be left in
Thermal Flush Mode after system flushing is complete. Thermal Flush Mode is
activated by a removable lever handle that should only be kept by maintenance
personnel. The lever handle is painted orange as an indicator that Thermal
Flush Mode is on. When flushing is complete, maintenance personnel must
disengage and remove the lever handle, and replace the green safety cap to
prevent tampering by end users. Thermal disinfection mode cannot be activated
without the lever handle. If the lever handle is lost, the mixing valve will
continue to operate as a standard ASSE 1070/ASME A112.1070/CSA B125.70 device.
Thermal Flush Mode Procedure:
- Turn off the cold water supply at the supply stop.
- Remove the green plastic cap with a flat head screwdriver (figure 1).
- Check that the locknut on the stem is tight to prevent unwanted adjustment during flushing.
- Slide the orange lever handle notch over the exposed cross-pin (figure 2).
- Rotate the lever handle to lift the cross-pin and retainer (Figure 3). The valve is now in Thermal Flush Mode.
- Perform system flush as needed.
- RETURN HANDLE TO SAFE TEMPERATURE SETTING: Rotate the lever handle to lower the cross-pin and exit Thermal Flush Mode.
- Replace the Green plastic cap
- Turn on the cold water supply.
ZURN WILKINS
- 1747 Commerce Way,
- Paso Robles,
- CA 93446
- Phone:855-663-9876
- Fax:805-238-5766
- www.zurn.com.
- Patent zurn.com/patents.
Aqua-Gard® Thermostatic Mixing Valve with Thermal Flush Mode This product contains a weighted average lead content of less than 0.25% for wetted surfaces. ISZW3870XLTF (REV. B 3/22)
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>