TYPICAL WIRING DIAGRAMS
| Diagram 14 |
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| 346V 3Ø 50 HZ |
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| L1 L2 L3 | 1 |
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| GND |
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| 1 HTR | 1L1 | C1 | FU1 |
| FU7 |
| C3 | 3L1 | 3 HTR |
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| 2 | 1L2 |
| FU2 |
| FU8 |
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| 3L2 |
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| GND | 1L3 |
| FU3 |
| FU9 |
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| 3L3 |
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| 2 HTR | 2L1 | C2 | FU4 |
| FU10 |
| C4 | 4L1 | 4 HTR |
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| 2L2 |
| FU5 |
| FU11 |
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| 4L2 |
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| 2L3 |
| FU6 |
| FU12 |
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| 4L3 |
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Feed Water |
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| 3 |
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| 5L1 |
| FU13 CR | 10L |
| IT1 | Feed Water | ||
| Electrical |
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| 1PB |
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Connection |
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| GND |
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| 5L2 |
| FU14 | 20L |
| IT2 | 1 | Motor | ||
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| 2 2TB | 1TB | FU16 |
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| 5L3 |
| FU15 | 30L |
| IT3 | Mtr |
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| 1 |
| 1CR |
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C1 | C2 | C3 | C4 | 2 |
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| Customer | |
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| FU | GND | 1 |
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| Connect |
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FU | FU | FU |
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| GND |
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10 |
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1 2 3 | 4 5 6 | 7 8 9 |
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11 12 |
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| 3 |
| 220 VAC Single Phase Control Circuit |
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| 3 |
| 4 |
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| GND |
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| 1 |
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| 2 |
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| HTR |
| HTR |
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| B |
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| W |
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| FU16 |
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| 1LT |
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| 1 |
| 2 |
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| B 1PB On |
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| BR |
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| Boiler |
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| HTR |
| HTR |
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| R |
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| Off | IFS |
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| 1 | On |
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| Y |
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| 9.9 |
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| CR |
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| 2PS |
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Cabinet Exterior Left Side |
| Panel Layout | Cabinet Exterior Right Side |
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| O | 1PS | O |
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| C1 | Heater Contactor |
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| C2 | Heater Contactor |
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| C3 | Heater Contactor |
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| Wire Color Code |
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| C4 | Heater Contactor |
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| B | = | Black |
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| BR | = | Brown |
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| R | = | Red |
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| O | = | Orange |
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| Customer Pump |
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| Y | = | Yellow |
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| B |
| Connection | W |
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| G | = | Green |
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| BL | = | Blue |
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| W | = | White |
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PRE-OPERATION CHECK
After proper wiring and piping of boiler system is complete, testing of controls can start. Before testing controls, it is recommended that all contactor fusing be removed. This is to prevent possible element failure under test conditions.
A. OPERATING AND TESTING THE McDONNELL &
MILLER LOW WATER CUTOFF CONTROL.
WARNING: Be sure all electrical connections are tight before energizing boiler. Reset all manual reset con- trols by pushing reset buttons on: (1) high limit control located on top of boiler and (2) McDonnell & Miller located on the side of boiler.
1. Be sure all valves from incoming water supply are fully open. |
Turn boiler switch to “ON” position, pump or solenoid |
valve will energize, allowing boiler to fill with water. Proper |
water level is automatically reached with level control sup- |
plied. Pump or solenoid feed will shut off at proper water level. |
Contactor(s) will energize, supplying power voltage to ele- |
ments. |
2. Checking operation of pump switch. (Figure 1) With water |
level visible in sight glass, partially open drain valve at bottom |
of boiler. If automatic blowdown supplied, push manual blow- |
down switch until valve open light is on, hold for few seconds. |
Water level will fall, allowing float to trip pump switch to |
“ON” position. Close drain valve or release manual blowdown |
switch. |
Pump motor or solenoid valve will energize and water level |
will resume to normal level in sight glass. |
3. Checking low water cutout switch operation, open drain |
valve completely. If automatic blowdown supplied, push in |
and hold manual blowdown switch until water level falls |
enough to trip cutout switch. Close drain valve or release man- |
Pump
Terminals
Alarm
Circuit
Terminals
Pump
Circuit
Terminals
Line
and
Alarm
Switch
C |
A |
Pump
Switch
Adjusting
Screws
D |
B |
ual blowdown switch. If low water cutout is automatic reset, |
pump or solenoid will return water level to normal. If low |
water cutout is manual reset, then manual reset button on |
McDonnell & Miller low water cutoff control must be pushed |
to complete circuit. Turn off boiler. Reinstall contactor |
fuses. |
Figure 1 — Automatic Reset
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