Daikin MT6210 - Introduction; Reference Documents; Approved Refrigerant Detection System

INTRODUCTION
MT6210 A2L MITIGATION CONTROLDAIKIN APPLIED
4
Introduction
Daikin Applied units equipped with an A2L refrigerant, such
as R32, require means for mitigation in the unlikely event of a
refrigerant leak. The mitigation means is prescribed in UL 60335-
2-40 to ensure there is never a build-up of leaked refrigerant in
excess of the lower ammability limit (LFL) which may result in
a combustion event in the unit. The primary mitigation actions
include providing circulating airow adequate to dilute the
leaked refrigerant and to suppress the activation of potential
ignition sources, such as contactors and heating elements. The
e󰀨ectiveness of an implemented mitigation strategy is rigorously
tested at a certied UL test laboratory to ensure the e󰀨ectiveness
of the detection and mitigating action for each product prior to
release for sale.
This manual is intended for technicians or other qualied
personnel. Contact the Daikin Applied Controls Customer
Support group at 866-462-7829 or email DaikinControls@
daikinapplied.com for additional assistance.
Reference Documents
Title Number Company Source
A Data Communication
Protocol for Building
Automation and Control
Networks
ANSI/
ASHRAE
American Society of
Heating, Refrigerat-
ing, and Air Condi-
tioning Engineers
www.ashrae.org
Approved Refrigerant Detection
System
Daikin Applied equipment equipped with an A2L refrigerant have
a factory installed leak detection system. This UL-approved A2L
refrigerant detection system (RDS) consists of the following
components:
• A2L Leak Detection Control Board
— Control Designation: MT6210
— Daikin Applied Part Number: 910419225
— Quantity: 1 controller per unit (typical)
• Refrigerant Sensor(s)
— Daikin Applied Part Number: 910419801
— Quantity: 1 to 8 sensors per unit
The sensor(s), if more than one, are wired in a daisy chain
conguration and terminated at the mitigation board. The
refrigerant sensors detect the presence of the A2L refrigerant
outside of the sealed refrigeration piping and communicates
the concentration levels directly to the MT6210. The MT6210
board communicates the refrigerant detection system status to
a unit controller and/or other system components to initiate the
appropriate mitigation response.
The factory installed RDS in the Daikin Applied equipment may
not be eld modied.
WARNING
Field replacement components must be Daikin Applied approved service
parts. The use of non-certied parts can result in property damage, personal
injury, or death.
WARNING
Do not attempt to disable or modify installed sensors in any way. Disabled
or modied sensors can result in property damage, personal injury, or death.
WARNING
The location of the refrigerant sensors must not be changed. Improperly
located sensors can result in property damage, personal injury, or death.
WARNING
Sensors must be properly mounted and secured to the original mounting
brackets supplied with the unit. Improperly mounted sensors can result in
property damage, personal injury, or death.
WARNING
Do not allow the sensor inlet to become blocked. Sensors with blocked inlets
can result in property damage, personal injury, or death.
WARNING
Care should be taken when servicing the equipment to protect the refrigerant
sensors from contamination, i.e. cleaning solutions, oil, lubricants, etc.
WARNING
Care should be taken when servicing the equipment to protect the refrigerant
sensors from physical damage, i.e. impact from hand tools.
WARNING
Faulty sensors must be replaced promptly upon failure detection. Allowing
the system to operate with faulty sensors can result in property damage,
personal injury, or death.