7800 SERIES EC7810A, EC7820A RELAY MODULES
Table 1B. EC7820A Terminal Ratings.
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Terminal No. | Abbreviation | Description | Ratings |
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G | | Flame Sensor Ground a | |
Earth G | | Earth Grounda | |
N | | Line Voltage Common (Neutral) | |
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3 | AL | Alarm (Normally Open) | 220/230/240 Vac, 1A, 10A inrush for 5000 cycles. |
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4 | FAN | Burner/Blower Motor | 220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush. |
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5 | L1 | Line Voltage Supply (L1) | |
6 | RT | Limits and Burner Control | 220/230/240 Vac, 5A (maximum). |
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7 | LD2 | Airflow Switch Input | 220/230/240 Vac, 1 mA. |
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8 | PV1 | Pilot Valve 1 (interrupted) | 220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.c |
9 | MV | Main Fuel Valve | 220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.c |
10 | IGN | Ignition | 220/230/240 Vac, 4A at P.F. = 0.2.c |
F(11) | | Flame Signal | 135 to 220 Vac, current limited. |
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13 | COM | Firing Rate Common | 220/230/240 Vac, 4A at P.F. = 0.5.d |
14 | MOD | Firing Rate Modulate | 220/230/240 Vac, 4A at P.F. = 0.5.d |
16 | | Control Voltage | |
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17 | ES2 | Preignition Interlock Input | 220/230/240 Vac, 1 mA. |
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18 | ES1 | Low Fire Switch Input | 220/230/240 Vac, 1 mA. |
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20 | LOS | Lockout Input | 220/230/240 Vac, 1 mA. |
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21 | PV2 | Pilot Valve 2 (Intermittent) | 220/230/240 Vac, 4A at P.F.= 0.5, 20A inrush. c |
22 | SHTR | Shutter |
aSee Table 2.
b2000 VA maximum connected load to 7800 SERIES Relay Module Assembly.
cTotal load current, excluding burner/boiler motor and firing rate outputs cannot exceed 5A, 25A inrush. d Can also be 24 Vac, 3A at PF = 0.5.
e
Table 2. Recommended grounding practices.
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Ground type | Recommended Practice |
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Earth ground (subbase and relay module). | 1. Use to provide a connection between the subbase and the control panel of |
| the equipment. Earth ground must be capable of conducting enough current |
| to blow the 20A fuse (or breaker) in the event of an internal short circuit. |
| 2. Use wide straps or brackets to provide minimum length, maximum surface |
| area ground conductors. If a leadwire must be used, use 14 AWG copper |
| wire. |
| 3. Make sure that |
| of nonconductive coatings and protected against corrosion on mating |
| surfaces. |
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Signal ground (KDM, Data ControlBus | Use the shield of the signal wire to ground the device to the signal ground |
Module™, Communications Interface | terminal 3(c) of each device. Connect the shield at both ends of the daisy chain |
ControlBus™ Module). | to earth ground. |
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