Brochure

Features
• Field Adjustable Control
• Three Feed Options:
LWCO Mode, Fixed Feed, or Manual Feed
• Manual Feed Button
• Internal Excess Feed Reset Button
• Multi-Colored External Indicator Light
• DIP Switch Mode Settings Control:
Delay Before Feed, Excess Feed, Selectable Feed &
Hold After Water OK
• Flood Protection Lockout
• Underfeed Protection
• Available in 24 & 120 VAC
• UL & CUL Approved
• Patent Pending
• 3/8”NPT to 1⁄2” Copper Fittings Included
• Integral Valve Strainer
• Universal Low Water Cutoff Compatibility
EWF024 & EWF120 Specifications
Input Supply Voltage: 24 VAC (supplied by Class 2
power source) or 120 VAC
Power Consumption: EWF024: 10VA, EWF120: 12 VA
(During Feed Only)
Maximum Inlet Water Pressure: 150 PSI (10.5kg/cm2)
Maximum Outlet (Boiler) Steam Pressure:
15 PSI (1kg/cm2)
Maximum Media Temperature: 160°F (71°C)
Maximum Ambient Temperature: 100°F (38°C)
Feed Rate: 1 gpm (3.8 lpm)
DIP Switch Settings
Operation Settings: Low Water Cutoff (LWCO) or
Fixed Feed Mode
Delay Before Feed Settings: 0, 0.5, 1, 2, 4, 6, 8, 10 minutes
Excess Feed Mode Settings: Off, 6, 8, 10, 12, 15 gallons
Fixed Feed Amount Settings: Off, 1, 2, 3, 4, 5 gallons
Hold After Water OK Settings: 0, 0.5, 1, 2 minutes
Flood Protection Lockout: After 2 cycles in Fixed
Feed Mode or 10 gallons in LWCO Mode
Listings/Approvals
UL Guide (MBPR) for Limit Controls per UL Standard
353 Limit Controls.
CUL per CSA Standard C22.2 No. 24-93 for
temperature indicating and regulating equipment.
Materials of Construction
Enclosure: NEMA Type 1 (For indoor use only). Formed
sheet metal with powder coat/plated finish. Five
knock-outs for 1⁄2” conduit fittings. Not for use in
hazardous locations.
Valve: Brass
Accessories: Two 3/8” NPT x 1⁄2” copper fittings
Application
The Electric Water Feeder (EWF) monitors the output from a Low Water Cutoff (LWCO). When
the LWCO detects a low water condition, it signals the EWF, which initiates a water-feed cycle.
Since the EWF is fully programmable, it can feed as long as the Low Water Cutoff detects a low
water condition (LWCO Mode) or feed a pre-determined amount. In addition, the EWF allows
the user to set Delays Before Feeding (DBF), or Hold After Water OK (HAW) once the low water
cutoff signals water level is restored. The EWF also includes a patent pending programmable excess
feed indicator. Once the EWF has fed more then the programmed number of gallons into the
boiler over the past 30 days, an external LED blinks. This will help identify systems that may need
maintenance.
Operation
LWCO Mode: As soon as the Electric Water Feeder receives a low water signal from the
LWCO, the EWF starts feeding water to the boiler after the Delay Before Feed expires, if enabled.
The EWF continues to feed water to the boiler until the LWCO signals that the water condition is
normal and any Hold After Water OK delay settings expire. If the EWF feeds more then 10 gallons,
Flood Protection Lockout Occurs and feeding stops immediately and a red LED is illuminated.
Fixed Feed Mode: When the Electric Water Feeder receives a low water signal from the
LWCO, the EWF will feed the number of gallons set by the DIP switches on the control (1, 2, 3,
4, or 5 gallons). Feeding will start after any Delay Before Feed setting expires. After a feed cycle
completes, if the LWCO still signals a low water condition, the EWF will start another feed cycle.
If the EWF completes the second feed cycle and the LWCO still signals a low water condition, the
EWF will enter the Flood Protection Lockout and a red LED is illuminated. Pressing and holding the
Manual Feed button for 2 seconds will reset the Flood Protection Lockout.
Manual Feed: By pressing the Manual Feed button, the user can feed water to the boiler system.
Up to 5 gallons may be manually fed continuously before the EWF automatically closes the feed
valve. Water fed manually counts toward the Excess Feed setting.
Excess Feed: The Excess Feed LED will rapidly blink amber when the EWF has dispensed more
water over the past 30 days than the setting of the Excess Feed switch (6, 8, 10, 12, 15 gallons).
Unlike other controls where power needs to be removed and reconnected to the control, the
Taco EWF has an internal reset button. There is also no need to check, record and reset the feed
counter just to determine if too much water has been added. The external LED provides a simple
and fast means to determine that the boiler system is consuming excessive amounts of water,
so service personnel can repair the piping or boiler before the system sustains more damage or
further corrosion.
Hold After Water OK: The Hold After Water OK delay permits the water level to rise above
the level of the LWCO probe or float mechanism and provides additional water into the system.
This prevents intermittent low water conditions and resulting short cycling of the boiler during calls
for heat. Short cycling reduces the boiler’s life expectancy and unnecessarily stresses the system.
Dimensions
Submittal Data Information
Electric Water Feeder
Submittal Data # 101-108
Supersedes: New
Effective: 02/15/05
Taco Inc., 1160 Cranston Street, Cranston, RI 02920 / [phone] / Fax [phone]
Taco (Canada) Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3 / [phone] / Fax [phone]
www.taco-hvac.com
HY DRONIC COMP ON EN TS & SYS TE MS