Watts 1156F Series - User Manual

IS-1156F
Series 1156F, T156B and N256
Feed Water Pressure Regulators
Sizes:
1
⁄2" –
3
⁄4" (15 – 20mm)
Operation
1. To fi ll the system, open the shutoff valve upstream of the regulator. This valve must always be kept open when the system is in
operation. Water will fl ow into the system until it is full and under pressure.
Note: Series with Fast Fill and Purge Lever
1
⁄2" valves are equipped with a unique and simple “fast fi ll and purge
lever” which permits rapid fi lling of the system, and sustained fl ow for air purging. When the lever is raised to
the vertical position it pushes a removable “Push Rod” down. This manually forces the valve to a wide open
position for maximum fl ow. Returning the lever to its normal position releases the tension on the rod permit-
ting the valve to maintain normal system pressure.
Caution: Always observe the Boiler Pressure Gauge when using this feature. Using this feature with the
Purge Valve closed can result in over pressurizing the system or exceeding the Pressure Safety Relief Valve
setting. Over pressurization can result in a water discharge from the Relief Valve. This feature can be disabled
to prevent tampering or accidental misuse of the fast fi ll feature by simply unscrewing the fast fi ll lever cap and
removing the push rod.
2. The regulator is set to deliver water to the boiler at approximately 15 lbs. pressure. This pressure is suffi cient for a 3 story building.
To reset the reducing valve for higher pressure (when the pressure is not suffi cient to lift the water to highest radiation):
A. Calculate the number of feet from the regulator to the top of highest radiation.
B. Multiply this number by 0.43 and add 3 lbs. This will give the pressure required to raise the water to the highest radiator
and keep the system under pressure.
3. To reset the regulator valve:
Remove the fast fi ll lever cap, and loosen the lock nut. To raise the reduced pressure - slowly turn the adjusting screw clockwise
until the system gauge indicates the pressure required. To lower the reduced pressure - turn the adjusting screw counterclockwise.
After completing adjustments, tighten the lock nut and replace the fast fi ll lever cap.
Note: Watts is not responsible for boiler failure on boilers without low water cutoffs.
IMPORTANT: Annual inspection of all water system safety and control valves is required and necessary. Regular inspection, testing
and cleaning assures maximum life and proper product function.
Installation Instructions
1. The Watts Feed Water Pressure
Regulator must be installed on the
cold water supply line to the boiler. It
may be installed in either vertical or
horizontal position. Allow suffi cient
clearance to operate the fast fi ll and
purge lever.
2. Install a shutoff valve upstream
of the regulator.
Note: Local codes typically require the
use of a backfl ow preventer in the
system (Watts Model 9D). Consult
local authorities for the type, instal-
lation and testing requirements.
The backfl ow preventer must be
installed upstream of the regulator.
3. Prior to installing the regulator, fl ush
out the supply pipe to clear it of chips,
scale, dirt, etc.
4. Install the Watts regulator in the sup-
ply line to the boiler with the arrow on
the valve body pointing in the direction
of fl ow to the boiler.
*See reverse side for servicing and important information.
Installation Diagram
To
Expansion
Tank
To Radiation
Hot Water
Boiler
*Pressure
Relief
Valve
*Pressure
Relief
Valve
No. 90
Back ow
Preventer
Shut off
Valve
Drain
Return
Cold Water

Summary

Installation Instructions

General Installation Steps

Steps for installing the regulator including upstream valve, flushing, and correct flow direction.

Backflow Preventer Requirement

Local codes may require a backflow preventer installed upstream of the regulator.

Operation

System Filling and Purging

Using the fast fill and purge lever for rapid system filling and sustained air purging.

Pressure Adjustment Procedure

Calculating and resetting the regulator's output pressure for optimal water flow to radiation.

Important Operational Notes

Annual inspection of safety valves and caution against disabling fast fill features.

Service and Maintenance

Strainer Screen Servicing

Recommended servicing frequency for the strainer screen and unitized replacement maintenance.

Cleaning or Replacing Parts

Step-by-step instructions for disassembling, cleaning, and reassembling regulator components.

Troubleshooting

Dripping Pressure Safety Relief Valve

Indication of regulator service need and explanation of relief valve function.

Other Potential Causes

Possible issues like water-logged air cushion tanks or leaks in tankless coils.

Periodic System Inspection

Importance of regular inspection by qualified technicians due to corrosive conditions and temperatures.

Ordering and Specifications

Repair Kit Information

Details on ordering repair kits for Series 1156F-N256, including kit numbers and sizes.

California Proposition 65 Warning

Warning regarding chemicals known to cause cancer and reproductive harm.

Limited Warranty Statement

Information on the one-year warranty, exclusions, and limitations.

Watts 1156F Series Specifications

General

Series	1156F
Type	Pressure Reducing Valve
Body Material	Bronze
Inlet Size	1/2 in., 3/4 in., 1 in., 1 1/4 in., 1 1/2 in., 2 in.
Outlet Size	1/2 in., 3/4 in., 1 in., 1 1/4 in., 1 1/2 in., 2 in.
Max Inlet Pressure	400 psi