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Summary of Contents for McDonnell & Miller Uni-Match WFE-24
- Page 1 INSTRUCTION MANUAL MM-323G 211163...
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Page 2: Specifications
SPECIFICATIONS Maximum Water Pressure: Electrical Ratings 150 psi (10.5 kg/cm Power Maximum Boiler Pressure: Model Voltage** Consumption* 15 psi (1 kg/cm WFE-24 24VAC 15VA Pipe Connections: WFE-120 120VAC 20VA 3/8" NPT (sweat adapters included for connection * During Feed Cycle to 1/2"... - Page 3 STEP 2 - Electrical Installation IMPORTANT WARNING Boiler manufacturer schematics should be followed. In To prevent electrical shock, turn off the electrical power before making electrical the event that the boiler manufacturer's schematic does not exist, or is not available from the boiler manufacturer, connections.
- Page 4 Diagram 5 Wiring Diagram Legends WFE-120 / 67 with 120 volt burner circuit Bold lines indicate action to be taken • Connect wire from terminal 'N' of water in Step shown. feeder to 'Neutral' wire of burner circuit. • Connect wire from terminal 'H' of water Grey lines indicate existing wiring.
- Page 5 Diagram 8 Diagram 11 WFE-120 / 67 with millivolt burner circuit WFE-24 / Hydrolevel CG400 • Install wire from 120 volt circuit 'Neutral' wire to terminal 'N' • Connect wire from terminal 'N' of water feeder on water feeder. to terminal '2' on LWCO. •...
- Page 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...
- Page 8 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 specifications referred to in the quotation or sales form, if such specifications 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 first, unless a longer period is specified in the product documentation (the “Warranty”).
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Questions and answers
My WFE-24 Uni-Match water feeder is overfeeding along with the condensate return. How can the fill time be lowered to shorten this?
The fill time on a McDonnell & Miller Uni-Match WFE-24 water feeder can be lowered by adjusting the Dwell/Feed Selector Switch. The feeder has a DIP switch block with four on/off switches, each corresponding to a specific dwell/feed cycle. To reduce overfeeding, set the switches to a shorter dwell/feed cycle. Additionally, orifices can be used to change the feed rate to 1 gpm instead of the standard 2 gpm, further controlling water flow into the boiler.
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Water feeder going into red no leak in return line.
The McDonnell & Miller Uni-Match WFE-24 water feeder shows a red indicator when it exceeds the dwell/feed period or encounters an issue preventing proper operation. Possible reasons include:
1. LWCO Not Satisfied – The low water cut-off (LWCO) is not detecting a sufficient water level, keeping the feeder active beyond its allowed cycle.
2. Improper Wiring – Incorrect wiring connections between the water feeder and LWCO could cause the feeder to malfunction.
3. Delay on Make (DOM) Timing Issue – The feeder's DOM setting may not be properly adjusted, leading to excessive delay in restoring water.
4. Feeder Malfunction – A fault in the feeder unit could prevent it from turning off after the required water level is reached.
If there is no leak in the return line, checking LWCO operation, wiring connections, and the feeder's dwell/feed settings is recommended.
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