McDonnell & Miller Uni-Match WFE-24 User manual

INSTRUCTION MANUAL
MM-323G
211163

Power
Model Voltage** Consumption*
WFE-24 24VAC 15VA
WFE-120 120VAC 20VA
WATER FEEDER INLET
VALVE
OUTLET
VALVE
UNION
UNION
STRAINER
CITY
WATER SUPPLY
CHECK
VALVE
BYPASS
VALVE
UNION
BYPASS
CONNECT TO
RETURN HEADER
ON BOILER
2
1a. Control must be installed within eyesight of boiler.
b. Clearance must be provided on all sides to
service control.
c. Unit must be installed in a horizontal pipe
in an upright position.
d. Arrow on feeder must point in the
direction of flow into the boiler.
e. Install isolation valves and unions on the
inlet and outlet piping for easier trouble
shooting and repair/replacement.
f. Install manual fill valve and bypass line for
removal while the boiler is in service.
2. Water feeders are shipped from the factory equipped
for a 2 gpm feed rate. A separate kit with instruction
sheet and field installable orifices for 1 gpm and 4 gpm
feed rates is included. If the alternate feed rates are
required, refer to the instruction sheet provided with the
kit for orifice replacement. 1 GPM
Orifice
4 GPM
Orifice
Dwell/Feed
Selector Switch
Multi
Function
LED
Manual
Feed
Button
2
3
41
ON
SW1
OFF
SPECIFICATIONS
Maximum Water Pressure:
150 psi (10.5 kg/cm2)
Maximum Boiler Pressure:
15 psi (1 kg/cm2)
Pipe Connections:
3/8" NPT (sweat adapters included for connection
to 1/2" copper pipe)
Flow Data:
2 gpm (7.6 lpm) standard
Orifices included to change feed rate to 1 gpm
(3.8 lpm) or 4 gpm (15.1 lpm)
Maximum Water Temperature:
120 F (49 C)
Maximum Ambient Temperature:
100˚F (38˚C)
Dwell/Feed Selector Switch
The water feeder has a DIP
type switch block with
four on/off switches. Each switch has a specific
dwell/feed cycle which is activated upon receiving
a signal from the LWCO. The feeder will be deacti-
vated when the LWCO is satisfied or if the
dwell/feed period has been exceeded.
Manual Feed
There is a manual feed button which when pressed
will add water to the boiler.
Multi-Color LED
A multi-color LED indicates status during operation,
incorrect switch selection and when dwell/feed
cycle has been exceeded.
Dwell/Feed Cycle Limit
The feeder will stop feeding water whenever the
selected dwell/feed cycle time has been exceeded
and the LWCO is still sending a signal.
STEP 1 - Installation
Electrical Ratings
* During Feed Cycle
** 50/60 Hz
oo

3
Boiler manufacturer schematics should be followed. In
the event that the boiler manufacturer's schematic does
not exist, or is not available from the boiler manufacturer,
refer to the schematics provided in this document.
IMPORTANT
To prevent electrical shock, turn off the
electrical power before making electrical
connections.
Failure to follow this warning could cause
property damage, personal injury or death.
WARNING
Terminal Connections
N
P
M
For all wire connections to the terminal block (M).
1. Strip about 1/3" (8.5 mm) of insulation from the wire.
2. Loosen the terminal screw (N) but DO NOT
REMOVE. Move the wire clamping plate (P) back
until the plate touches the back side of the screw head.
3. Insert the stripped end of the wire under the wire
clamping plate (P) and securely tighten the
terminal screw (N).
Do not use automatic water feeders with manual reset
LWCO's. Failure to follow this warning could cause
flooding, property damage, personal injury or death.
WARNING
Unless otherwise noted, water feeder voltage should be
the same as the LWCO and burner circuit voltage.
NOTE
Before wiring water feeder, operate boiler and check all
safety devices.
NOTE
Wire must be 18 AWG (min) or as required by local code.
Wire insulation rating must be at least 167˚F (75˚C)
NOTE
STEP 2 - Electrical Installation
Feeder Model LWCO Model Diagram Number Page
WFE-24 PS-802 with burner wiring harness 1 4
WFE-24 PS-802 with burner terminal connections 1 4
WFE-24 67 w/24 volt burner circuit 4 4
WFE-24 67 w/120 volt burner circuit 6 4
WFE-24 67G (millivolt burner circuit) 9 5
WFE-120 PS-801 with numbered terminals 2 4
WFE-120 PS-801 with lettered terminals 3 4
WFE-120 67 w/24 volt burner circuit 7 4
WFE-120 67 w/120 volt burner circuit 5 4
WFE-120 67G (millivolt burner circuit) 8 5
WFE-24 Hydrolevel 400 10 5
WFE-24 Hydrolevel CG400 11 5
WFE-120 Hydrolevel 450 12 5
WFE-120 Hydrolevel CG450 13 5
WFE-120 Hydrolevel CGT450 14 6
WFE-24 Honeywell LWCO (24 volt) 15 6
WFE-120 Honeywell LWCO (120 volt) 16 6
WFE-24 TACO LWCO (24 volt) 18 6
WFE-120 TACO LWCO (120 volt) 17 6
Wiring Diagram Selection Chart
Based on the water feeder and low water cut-off combination you are installing, select proper wiring
diagram and proceed to that page.
WFE-24 PSE-802 with burner wiring harness
1 4
WFE-24 PSE-802 with burner terminal connections
1 4
WFE-120 PSE-801 with lettered terminals
34

4
Wiring Diagram Legends
1. Bold lines indicate action to be taken
in Step shown.
2. Grey lines indicate existing wiring.
PS-802-24
LWCO
BNH
UNI-MATCH
WATER FEEDER
WFE-24
Factory
Jumper
Bar
WNH
•Connect wire from terminal 'N' of water
feeder to terminal ''N' on LWCO.
• Connect wire from terminal 'H' of water
feeder to terminal 'H' on LWCO.
• Connect wire from terminal 'W' of water
feeder to terminal 'W' on LWCO.
Diagram 1
WFE-24 / PS-802 / 36(802 /:&2
WNH
PS-801-120
LWCO
UNI-MATCH
WATER FEEDER
WFE-120
Field or
Factory
Jumper
Wire
P12345
• Connect wire from terminal 'N' of
water feeder to terminal '2' on LWCO.
• Connect wire from terminal 'H' of
water feeder to terminal '1' on LWCO.
• Connect wire from terminal 'W' of
water feeder to terminal '4' on LWCO.
Diagram 2
WFE-120 / PS-801-LWCO with numbered terminals
PS-801-120
LWCO
UNI-MATCH
WATER FEEDER
WFE-120
NH
WNH
Factory
Jumper
Bar
• Connect wire from terminal 'N' of
water feeder to terminal 'N' on LWCO.
• Connect wire from terminal 'H' of
water feeder to terminal 'H' on LWCO.
• Connect wire from terminal 'W' of
water feeder to terminal 'W' on LWCO.
Diagram 3
WFE-120 / PS-801/PSE-801 /:&2with lettered terminals
WNH
BURNER
12
34
NEUTRAL
24 VAC
HOT
UNI-MATCH
WATER FEEDER
WFE-24
SERIES 67
LOW WATER
CUT-OFF
• Connect wire from terminal 'N' of
water feeder to 'Neutral' wire of
burner circuit.
• Connect wire from terminal 'H' of
water feeder to terminal '2' on
LWCO.
• Connect jumper wire connecting
terminals '2' and '3' of LWCO.
• Connect wire from terminal 'W' of
water feeder to terminal '4' on LWCO.
Diagram 4
WFE-24 / 67 with 24 volt burner circuit
WNH
BURNER
12
34
NEUTRAL
120 VAC
HOT
UNI-MATCH
WATER FEEDER
WFE-120
SERIES 67
LOW WATER
CUT-OFF
• Connect wire from terminal 'N' of water
feeder to 'Neutral' wire of burner circuit.
• Connect wire from terminal 'H' of water
feeder to terminal '2' on LWCO.
• Connect jumper wire connecting terminals
'2' and '3' of LWCO.
• Connect wire from terminal 'W' of
water feeder to terminal '4' on LWCO.
Diagram 5
WFE-120 / 67 with 120 volt burner circuit
WNH
BURNER
24V
TRANSFORMER
12
34
NEUTRAL
120 VAC
120 VAC
SUPPLY
HOT
UNI-MATCH
WATER FEEDER
WFE-24
SERIES 67
LOW WATER
CUT-OFF
•Install wire from burner circuit 'Neutral' wire to the trans
former input 'Neutral' terminal.
• Install wire from burner circuit 'Hot' wire to the transformer
input 'Hot' terminal.
• Install wire from transformer output 'Neutral' terminal
to terminal 'N' on the water feeder.
• Install wire from terminal 'W' on the water feeder to terminal
'4' on the low water cut-off.
• Install wire from transformer output 'Hot' terminal to terminal
'H' on water feeder and terminal '3' on low water cut-off.
NOTE: Transformer provided by others.
Diagram 6
WFE-24 / 67 with 120 volt burner circuit
WNH
BURNER
24V
TRANSFORMER
12
34
NEUTRAL
120V
HOT
UNI-MATCH
WATER FEEDER
WFE-120
SERIES 67
LOW WATER
CUT-OFF
• Install wire from burner circuit 'Neutral' wire to terminal 'N'
on water feeder.
• Install wire from burner circuit 'Hot' wire to terminal 'H' on
water feeder and terminal '3' on low water cut-off.
• Install wire from terminal 'W' on the water feeder
to terminal '4' on the low water cut-off.
Diagram 7
WFE-120 / 67 with 24 volt burner circuit
CW
B
NH CW
B

5
WNH
MILLIVOLT
BURNER
CIRCUIT
12
34
NEUTRAL
HOT 120V
UNI-MATCH
WATER FEEDER
WFE-120
SERIES 67
LOW WATER
CUT-OFF
•Install wire from 120 volt circuit 'Neutral' wire to terminal 'N'
on water feeder.
• Install wire from 120 volt circuit 'Hot' wire to terminal 'H' on
water feeder and terminal '3' on low water cut-off.
• Install wire from terminal 'W' on the water feeder
to terminal '4' on the low water cut-off.
Diagram 8
WFE-120 / 67 with millivolt burner circuit
WNH
MILLIVOLT
BURNER
CIRCUIT
12
34
NEUTRAL
HOT
24V
TRANSFORMER
120V
UNI-MATCH
WATER FEEDER
WFE-24
SERIES 67
LOW WATER
CUT-OFF
•Install wire from 120 volt circuit 'Neutral' wire to
the transformer input 'Neutral' terminal.
• Install wire from 120 volt circuit 'Hot' wire to the
transformer input 'Hot' terminal.
• Install wire from transformer output 'Neutral'
terminal to terminal 'N' on the water feeder.
• Install wire from transformer output 'Hot' terminal
to terminal 'H' on water feeder and terminal '3' on
low water cut-off.
• Install wire from terminal 'W' on the water feeder
to terminal '4' on the low water cut-off.
NOTE: Transformer provided by others.
Diagram 9
WFE-24 / 67 with millivolt burner circuit
UNI-MATCH
WATER FEEDER
WFE-24
21P
1P2A
WNH
HYDROLEVEL 400 Factory
Jumper
Bar
•Connect wire from terminal 'N' of water feeder to terminal
'2' on LWCO.
• Connect wire from terminal 'H' of water feeder to terminal
'1' on LWCO.
• Connect wire from terminal 'W' of water feeder to terminal
'A' on LWCO.
Diagram 10
WFE-24 / Hydrolevel 400
UNI-MATCH
WATER FEEDER
WFE-24
21P
1P2A
WNH
HYDROLEVEL CG400 Factory
Jumper
Bar
BURNER
•Connect wire from terminal 'N' of water feeder
to terminal '2' on LWCO.
• Connect wire from terminal 'H' of water feeder
to terminal '1' on LWCO.
• Connect wire from terminal 'W' of water feeder
to terminal 'A' on LWCO.
Diagram 11
WFE-24 / Hydrolevel CG400
UNI-MATCH
WATER FEEDER
WFE-120
21
P1P2A
WNH
Factory
Jumper
Bar
HYDROLEVEL 450
•Connect wire from terminal 'N' of water feeder
to terminal '2' on LWCO.
• Connect wire from terminal 'H' of water feeder
to terminal '1' on LWCO.
• Connect wire from terminal 'W' of water feeder
to terminal 'A' on LWCO.
Diagram 12
WFE-120 / Hydrolevel 450
UNI-MATCH
WATER FEEDER
WFE-120
21
P
1P2A
BURNER
WNH
HYDROLEVEL CG450 Factory
Jumper
Bar
•Connect wire from terminal 'N' of water feeder
to terminal '2' on LWCO.
• Connect wire from terminal 'H' of water feeder
to terminal '1' on LWCO.
• Connect wire from terminal 'W' of water feeder
to terminal 'A' on LWCO.
Diagram 13
WFE-120 / Hydrolevel CG450


7
STEP 3 - Testing
a. Open the inlet valve (X) and the outlet
valve (Y). Check for any leakage.
If there are any leaky connections, close
the inlet and outlet valves and correct
the problem.
b. Turn the boiler’s electric power
on and fill
it to the manufacturer's
recommended
normal water level by depressing the red
manual feed button (Z) on the water
feeder.
X
Y
FEED
INDICATOR
MANUAL
FEED
Z
B
c. Check the water feeder (B) operation by performing the following steps:
1. Slowly drain water from the boiler.
2. The burner should turn off when the water level drops below the cut-off level of the LWCO, which
will activate the water feeder's delay feed cycle.
3. Feeder should turn on to feed water to boiler after delay period has expired.
NOTE: Delay period is determined by position of selector. Unit is shipped
with switch in Position 2. Refer to chart on page 8 for alternate settings.
4.
Feeder will be deactivated when water level is restored to level as determined by LWCO.
NOTE: McDonnell & Miller Series PSE LWCO's have a 30 second DOM (Delay on Make) to
restore water level in boiler to an appropriate level without overfeeding.
Consult other
manufacturer's LWCO installation literature
for DOM times.
5.
Repeat steps to ensure feeder is operating satisfactorily.
If burner does not turn off when water level falls below level of LWCO, turn
off power to boiler and check operation of LWCO.
!
WARNING
Multi-Color LED
Upon receiving a signal from LWCO (power to terminal ‘W’) the multi-color LED will indicate the status
of the feeder.
Flashing Green Dwell Period -Solenoid Closed ————
Solid Green Feed Period -Solenoid Open ————
Flashing Red Invalid Feed Cycle Switch Setting Only one of the switches should be in the ‘ON’ position.
Solid Red Dwell/Feed Cycle Exceeded Check operation of LWCO.
LED Condition Solution

Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.mcdonnellmiller.com
McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries.
© 2018 Xylem Inc. MM-323G January 2018 Part No. 211163
COMMERCIAL WARRANTY
Warranty. For goods sold to commercial buyers, Seller warrants the goods sold to Buyer hereunder (with the exception of membranes, seals, gaskets, elastomer materials, coatings and other “wear parts” or consumables all of which are
not warranted except as otherwise provided in the quotation or sales form) will be (i) be built in accordance with the specications referred to in the quotation or sales form, if such specications are expressly made a part of this Agreement,
and (ii) free from defects in material and workmanship for a period of one (1) year from the date of installation or two (2) years from the date of manufacture, whichever shall occur rst, unless a longer period is specied in the product
documentation (the “Warranty”).
Except as otherwise required by law, Seller shall, at its option and at no cost to Buyer, either repair or replace any product which fails to conform with the Warranty provided Buyer gives written notice to Seller of any defects in material or
workmanship within ten (10) days of the date when any defects or non-conformance are rst manifest. Under either repair or replacement option, Seller shall not be obligated to remove or pay for the removal of the defective product
or install or pay for the installation of the replaced or repaired product and Buyer shall be responsible for all other costs, including, but not limited to, service costs, shipping fees and expenses. Seller shall have sole discretion as to the
method or means of repair or replacement. Buyer’s failure to comply with Seller’s repair or replacement directions shall terminate Seller’s obligations under this Warranty and render the Warranty void. Any parts repaired or replaced
under the Warranty are warranted only for the balance of the warranty period on the parts that were repaired or replaced. Seller shall have no warranty obligations to Buyer with respect to any product or parts of a product that have been:
(a) repaired by third parties other than Seller or without Seller’s written approval; (b) subject to misuse, misapplication, neglect, alteration, accident, or physical damage; (c) used in a manner contrary to Seller’s instructions for installation,
operation and maintenance; (d) damaged from ordinary wear and tear, corrosion, or chemical attack; (e) damaged due to abnormal conditions, vibration, failure to properly prime, or operation without ow; (f) damaged due to a defective
power supply or improper electrical protection; or (g) damaged resulting from the use of accessory equipment not sold or approved by Seller. In any case of products not manufactured by Seller, there is no warranty from Seller; however,
Seller will extend to Buyer any warranty received from Seller’s supplier of such products.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ANY AND ALL OTHER EXPRESS OR IMPLIED WARRANTIES, GUARANTEES, CONDITIONS OR TERMS OF WHATEVER NATURE RELATING TO THE GOODS PROVIDED
HEREUNDER, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WHICH ARE HEREBY EXPRESSLY DISCLAIMED AND EXCLUDED. EXCEPT AS
OTHERWISE REQUIRED BY LAW, BUYER’S EXCLUSIVE REMEDY AND SELLER’S AGGREGATE LIABILITY FOR BREACH OF ANY OF THE FOREGOING WARRANTIES ARE LIMITED TO REPAIRING OR REPLACING THE PRODUCT
AND SHALL IN ALL CASES BE LIMITED TO THE AMOUNT PAID BY THE BUYER FOR THE DEFECTIVE PRODUCT. IN NO EVENT SHALL SELLER BE LIABLE FOR ANY OTHER FORM OF DAMAGES, WHETHER DIRECT, INDIRECT,
LIQUIDATED, INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY OR SPECIAL DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OF PROFIT, LOSS OF ANTICIPATED SAVINGS OR REVENUE, LOSS OF INCOME, LOSS OF
BUSINESS, LOSS OF PRODUCTION, LOSS OF OPPORTUNITY OR LOSS OF REPUTATION.
LIMITED CONSUMER WARRANTY
Warranty. For goods sold for personal, family or household purposes, Seller warrants the goods purchased hereunder (with the exception of membranes, seals, gaskets, elastomer materials, coatings and other “wear parts” or
consumables all of which are not warranted except as otherwise provided in the quotation or sales form) will be free from defects in material and workmanship for a period of one (1) year from the date of installation or two (2) years from
the product date code, whichever shall occur rst, unless a longer period is provided by law or is specied in the product documentation (the “Warranty”).
Except as otherwise required by law, Seller shall, at its option and at no cost to Buyer, either repair or replace any product which fails to conform with the Warranty provided Buyer gives written notice to Seller of any defects in material or
workmanship within ten (10) days of the date when any defects or non-conformance are rst manifest. Under either repair or replacement option, Seller shall not be obligated to remove or pay for the removal of the defective product or
install or pay for the installation of the replaced or repaired product and Buyer shall be responsible for all other costs, including, but not limited to, service costs, shipping fees and expenses. Seller shall have sole discretion as to the method
or means of repair or replacement. Buyer’s failure to comply with Seller’s repair or replacement directions shall terminate Seller’s obligations under this Warranty and render this Warranty void. Any parts repaired or replaced under the
Warranty are warranted only for the balance of the warranty period on the parts that were repaired or replaced. The Warranty is conditioned on Buyer giving written notice to Seller of any defects in material or workmanship of warranted
goods within ten (10) days of the date when any defects are rst manifest.
Seller shall have no warranty obligations to Buyer with respect to any product or parts of a product that have been: (a) repaired by third parties other than Seller or without Seller’s written approval; (b) subject to misuse, misapplication,
neglect, alteration, accident, or physical damage; (c) used in a manner contrary to Seller’s instructions for installation, operation and maintenance; (d) damaged from ordinary wear and tear, corrosion, or chemical attack; (e) damaged due
to abnormal conditions, vibration, failure to properly prime, or operation without ow; (f) damaged due to a defective power supply or improper electrical protection; or (g) damaged resulting from the use of accessory equipment not sold
or approved by Seller. In any case of products not manufactured by Seller, there is no warranty from Seller; however, Seller will extend to Buyer any warranty received from Seller’s supplier of such products.
THE FOREGOING WARRANTY IS PROVIDED IN PLACE OF ALL OTHER EXPRESS WARRANTIES. ALL IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, ARE LIMITED TO ONE (1) YEAR FROM THE DATE OF INSTALLATION OR TWO (2) YEARS FROM THE PRODUCT DATE CODE, WHICHEVER SHALL OCCUR FIRST. EXCEPT AS OTHERWISE REQUIRED
BY LAW, BUYER’S EXCLUSIVE REMEDY AND SELLER’S AGGREGATE LIABILITY FOR BREACH OF ANY OF THE FOREGOING WARRANTIES ARE LIMITED TO REPAIRING OR REPLACING THE PRODUCT AND SHALL IN ALL CASES
BE LIMITED TO THE AMOUNT PAID BY THE BUYER FOR THE DEFECTIVE PRODUCT. IN NO EVENT SHALL SELLER BE LIABLE FOR ANY OTHER FORM OF DAMAGES, WHETHER DIRECT, INDIRECT, LIQUIDATED, INCIDENTAL,
CONSEQUENTIAL, PUNITIVE, EXEMPLARY OR SPECIAL DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OF PROFIT, LOSS OF ANTICIPATED SAVINGS OR REVENUE, LOSS OF INCOME, LOSS OF BUSINESS, LOSS OF
PRODUCTION, LOSS OF OPPORTUNITY OR LOSS OF REPUTATION.
Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusions
may not apply to you. This warranty gives you specic legal rights, and you may also have other rights which may vary from state to state.
To make a warranty claim, check rst with the dealer from whom you purchased the product or call +1-847-966-3700 for the name and location of the nearest dealer providing warranty service.
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