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:
LWCO Mode, Fixed Feed, or Manual Feed
Flood Protection Lockout
Excess Feed Indicator
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),
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.
Instruction Sheet
Electric Water Feeder
102-170
SUPERCEDES: REVISION DATED AUGUST 1, 2004
#5401148-REV B
EFFECTIVE: NOVEMBER 10, 2004
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Patent Pending
** 24 VAC to be supplied by an EXTERNAL Class 2 power source
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.
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.
150 PSI (10.5kg/cm
2
)
15 PSI (1kg/cm
2
)
160° F (71° C)
100°F (38°C)
1 gpm (3.8 lpm)
