Bard MC4002 Installation Instructions & Replacement Parts List

MC4002 Series Solid State Dual Unit Lead/Lag Controller INSTALLATION INSTRUCTIONS & REPLACEMENT PARTS LIST Bard Manufacturing Company, Inc. Bryan, Ohio 43506 www.bardhvac.com Manual : 2100-614K Supersedes: 2100-614J Date: 4-1-21 ...

CONTENTS Getting Other Information and Publications ...............3 Shipping Damage ...................................................3 General ..................................................................3 Theory of Operation ................................................3 Controller Certifications .................... ...

SHIPPING DAMAGE Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent. GENERAL These instructions explain the operation, installation an ...

There is an Ethernet-based remote communication option that can be either factory or field installed. See section on Communication Module. CONTROLLER CERTIFICATIONS The MC4002 main controller board, optional alarm boards, optional communication module, and remote sensors have undergone extensive testing for immunity and emission ...

A secondary sensor is located internally on the main controller board and serves as a reference and back-up sensor to the local sensor. If the difference between the two sensors is less than the differential setpoint, the local sensor will be used as the controller's temperature point of reference. The differential is adjustable ...

LOW VOLTAGE FIELD WIRING The MC4002 is powered from the air conditioners that it is controlling, 24 VAC (18-32V) low voltage only. Circuitry in the MC4002 isolates the power supplies of the two air conditioners so that no back feeds or phasing problems can occur. Additionally, if one air conditioner loses power, the MC4002 and t ...

IMPORTANT NOTE: Older Bard R-22 models employ an electronic blower control that has a 60-second blower off-delay. Current production R-410A models do not use a blower off-delay device and the remainder of this (paragraph) does not apply. In order to have immediate shutdown of the blower motor, in addition to disabling the run fu ...

GENERAL PROGRAMMING OVERVIEW MC4002 CONTROLLER BUTTONS AND FUNCTION On/Off Button 1. Press and release the On/Off button to turn On controller, 4-character display will illuminate and Lead unit LED will light. 2. Press and release the On/Off button to turn Off controller. Controller will go dark and A/C units will stop. Comfort ...

HUMIDITY REDUCTION OPTIONS The MC4002 does not include an indoor humidity sensor, and humidity reduction operation will require additional equipment installation. The following two methods are typically used with the MC4002 to reduce humidity. • A humidistat may be connected to the controller. When a humidistat is connected to ...

2. If all stages of cooling are satisfied, and relative humidity is above the set point of humidity controller: A. The green “Dehumidification Operation” light will come on and the lag unit compressor (Y1 and Y2) and blower (G) will operate until the setpoint of humidity controller is satisfied (or cancelled by a call for c ...