Product Overview

ManualsBrandsBard ManualsHVAC Replacement PartsAdvanced Solid State Dual Unit Lead/Lag Controller w/ Base Alarm Board

Note 1: Optional remote 35-foot space temperature sensors available, Bard PN 8612-023A. Controller automatically detects any connected sensors.

Note 2: Multiple Sensor Control Strategy:

A. If only the standard local sensor is used, it will govern space temperature control along with low and high temperature alarm monitoring.

B. If 1 remote sensor is installed and connected, the temperature readout display and the building temperature are controlled to an average of connected sensors.

If there is more than 10F difference between the two sensors, the actual control will be governed by the hottest sensor for cooling and the coldest sensor for heating.

Note 3: Requires optional ﬁeld installed humidity controller that closes on-rise, Bard PN 8403-038 recommended. Both HVAC unit must be equipped with electric

heat for this sequence to work properly.

Form No. S3548-1116

Supersedes NEW

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Feature Selection Guide MC4002 MC4002-A MC4002-AC MC4002-B MC4002-BC

2-unit lead/lag Yes Yes Yes Yes Yes

Cooling stages 4 4 4 4 4

Heating stages (conﬁgured for A/C with electric heat) 2 2 2 2 2

Heating stages (conﬁgured for Heat Pump) 4 4 4 4 4

Selectable Inter-Stage & On/Off Differentials Yes Yes Yes Yes Yes

Temperature control type Electronic Electronic Electronic Electronic Electronic

Display (4 character .375" high LCD) Digital Digital Digital Digital Digital

Stage “On” LED 4 cool/4 heat 4 cool/4 heat 4 cool/4 heat 4 cool/4 heat 4 cool/4 heat

Lead unit LED Yes Yes Yes Yes Yes

Advance (switch) lead unit feature Yes Yes Yes Yes Yes

One button comfort (72F Cooling, 68F Heating for 1-hour) feature Yes Yes Yes Yes Yes

Local sensor (standard with controller) Yes Yes Yes Yes Yes

Remote sensors option (See Notes 1 and 2) 2 2 2 2 2

Controller locking feature (prevents unauthorized changes) Yes Yes Yes Yes Yes

Smoke/ﬁre lockout circuit (immediate shutdown of controller & A/C) Yes Yes Yes Yes Yes

Generator run feature (inhibits lag A/C unit operation) Yes Yes Yes Yes Yes

Humidity control feature (See Note 3) Yes Yes Yes Yes Yes

Heat pump control feature Yes Yes Yes Yes Yes

Selectable continuous fan control, lead-both-none Yes Yes Yes Yes Yes

Both fans On @ 5F delta T between 2 sensors (selectable) Yes Yes Yes Yes Yes

Control strategy to limit excessive compressor cycling Yes Yes Yes Yes Yes

-24/48Vdc backup power connection for emergency alarms Yes Yes Yes Yes Yes

20-gauge metal controller enclosure Yes Yes Yes Yes Yes

Power loss alarm relay for both units No Yes Yes Yes Yes

HP/LP refrigerant lockout alarm relay for both units No Yes Yes Yes Yes

Smoke/ﬁre alarm relay No Yes Yes Yes Yes

Low temperature alarm thermostat and relay No Yes Yes Yes Yes

High temperature #1 alarm thermostat and relay No Yes Yes Yes Yes

Power loss alarm LED for both units No Yes Yes Yes Yes

HP/LP refrigerant lockout LED for both units No Yes Yes Yes Yes

Smoke/ﬁre LED No Yes Yes Yes Yes

Low temperature alarm LED No Yes Yes Yes Yes

High temperature #1 alarm LED No Yes Yes Yes Yes

Ethernet Communication Board for Remote Connectivity No No Yes No Yes

SNMP (Simple Network Management Protocol) traps and IPV6 No No No No Yes

High temperature #2 alarm relay No No No Yes Yes

2nd stage cooling alarm relay No No No Yes Yes

Controller failure alarm relay No No No Yes Yes

Economizer relay (emergency vent strategy) No No No Yes Yes

High temperature #2 alarm LED No No No Yes Yes

Controller failure alarm LED No No No Yes Yes