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SUPERCEDES: REVISION DATED AUGUST 1, 2004
#5401148-REV B
Patent Pending
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** 24 VAC to be supplied by an EXTERNAL Class 2 power source
GENERAL
The Electric Water Feeder (EWF), is an electronics based
water feeder for steam boilers. The 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 fixed feed amounts. In addition,
the EWF allows the user to set Delays Before Feeding (DBF),
OPERATION
LWCO Mode
When the mode switch of S1 (See fig. 9a) is set to the ON
position, the EWF will operate in LWCO mode. This causes
the EWF to feed water whenever the LWCO signals a low
water condition. Both the Delay Before Feeding (DBF), and
the Hold After Water OK (HAW), settings may be set in LWCO
mode. As soon as the EWF receives a low water signal from
the LWCO, the EWF starts feeding water to the boiler after
the DBF delay expires, if enabled. The EWF continues
feeding water to the boiler until the LWCO signals that the
water condition is normal and any HAW delay expires. If the
EWF feeds 10 gallons, Flood Protection Lockout occurs and
feeding stops immediately and a red LED is illuminated.
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Instruction Sheet
Electric Water Feeder
Listings/Approvals:
• UL GUIDE (MBPR) for Limit Controls per UL Standard
353 Limit Controls
• CUL per CSA Standard C22.2 No. 24-93 for tempera-
ture indicating and regulating equipment.
Process Connections: 3/8" FNPT or 3/8" NPT to 1/2" copper
fittings (included)
Enclosure:
NEMA Type 1 (For indoor use only.) Formed sheet metal
with powder coat/plated finish. Five openings for 1/2"
conduit fittings. (Not for use in hazardous locations.)
Maximum Inlet Pressure:
Maximum Outlet (Boiler) Pressure:
Maximum Media Temperature:
Maximum Ambient Temperature:
Feed Rate:
Feed Choices:
n
Flood Protection Lockout
Excess Feed Indicator
or hold delays after the low water cutoff signals water is
restored (HAW). The EWF also includes a programmable
excess feed indicator, (patent pending). The EWF blinks this
LED after it has fed more than a settable number of gallons
into the boiler over the past 30 days. This will help identify
systems that may need maintenance.
Fixed Feed
When the mode switch of S1 is set to the OFF position, the
EWF will operate in Fixed Feed, (FF), mode. While in this
mode, the EWF will feed the number of gallons set by switch
S3 (See fig. 9a & c). While in Fixed Feed mode, only DBF
delays may be used. HAW settings only apply to LWCO
mode. 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.
EFFECTIVE: NOVEMBER 10, 2004
150 PSI (10.5kg/cm
15 PSI (1kg/cm
160° F (71° C)
100°F (38°C)
1 gpm (3.8 lpm)
LWCO Mode, Fixed Feed, or Manual Feed
102-170
2
)
2
)
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Related Manuals for Taco EWF-120-1
Summary of Contents for Taco EWF-120-1
- Page 1 Instruction Sheet Electric Water Feeder 102-170 SUPERCEDES: REVISION DATED AUGUST 1, 2004 EFFECTIVE: NOVEMBER 10, 2004 #5401148-REV B Listings/Approvals: • UL GUIDE (MBPR) for Limit Controls per UL Standard 353 Limit Controls • CUL per CSA Standard C22.2 No. 24-93 for tempera- ture indicating and regulating equipment.
- Page 2 reset process, the Feed/Status Indicator will resume its normal state. Once the EWF is installed and the system is filled with water, reset the Excess Feed Condition to start •If the LWCO signals a normal water normal operation of the system. condition while the EWF is feeding a fixed Flood Protection Lockout amount, the EWF will NOT stop feeding...
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Page 3: Installation
TERMINAL BLOCK CONNECTIONS FIG. 2 CLAMPING PLATE TERMINAL FIG. 3 An uninsulated section of a single conductor should not be looped around the terminal and serve as two separate connections. The wire must be severed, thereby providing supervision of the connection in the event that the wire becomes dislodged from under the terminal. - Page 4 FIG. 5 EWF Standard Wiring T a c o L T x 1 2 0 x / L T x 0 2 4 x C O M G N D • • • • • Shock hazard. Disconnect power source before servicing.
- Page 5 DEFINITION OF DELAYS (SEE FIG. 8) ** The EWF will feed 1 gpm for inlet pressures of 20 to 120 PSI as long as the inlet/outlet pressure differential is at least 20 PSI. (For example, with a The amount of time before the boiler pressure of 15 PSI, the inlet pressure of the (Delay Before Feed) EWF starts feeding once a low...
- Page 6 Testing LWCO Mode Systems Turn off thermostat and ensure boiler system has power. Verify that the S1 mode switch is in LWCO mode and any DBF and HAW delays are set. Lower the boiler water level until the LWCO indicates a low water condition. Verify that the EWF feeds the boiler.
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Page 7: Troubleshooting
Troubleshooting If the EWF enters the Flood Protection Lockout, the system should be examined to determine the reason for the lockout condition. The EWF contains sophisticated electronics to detect circuit failures. In the unlikely event that the EWF detects a circuit failure, the Status LED blinks red, the feed valve closes, and the control enters a failsafe state. -
Page 8: Limited Warranty Statement
If in doubt as to whether a particular substance is suitable for use with a Taco product or part, or for any application restrictions, consult the applicable Taco instruction sheets or contact Taco at [401-942-8000].