Haier YR-H 71 Service Manual page 47

Abstract of Function
Remote control detector (heveunder as: detector) is the necessary part and user's optional part of Haier
commercial air conditioner remote monitor and control system. Net air conditioner (heveunder as: air
conditioner or remote) means a air conditioner with remote control interface on indoor computer board,
onlu which could combine with parts such as detector and central controller to form remote or detector
interface monitor and control system.
Detector is a key part of Haier commercial air conditioner remote monitor and control system, used for
transferring standard digital interface to realize communication between bus code and sub-address. It is
connected directly to air conditioner to realize local operation and collection of control information and
working information of air conditioner. Together with air conditioner central controller (hereunder as:
central controller) and air conditioner, form the Haier commercial air conditioner remote monitor and
control system — group control function network to realize data exchange and monitoring. Abstract
description as follows:
A. Communication Function
1. Communication with air conditioner
Perform wire communication with at most two air conditioners through 4-poles screw-fixing terminal,
and can realize two-unit switchover function when connected to two air conditioners, which control
operation status of air conditioner by different ways according to inner control or inquiry demand of
detector, and check working information and malfunction information of air conditioner at the same
time.
2. Communication with central controller (another optional accessory, a control component of Haier
commercial air conditioner remote monitor and control system)
Realize communication with central controller through RS-485 interface bus. According to the
components number set by internal dialing switch, receive commands from central controller, form
internal control or enquiry request of detector and answer reception status and working information
and malfunction information of air conditioner.
B. Power Failure Resume
To reduce the impaction to power network when air conditioners simultaneously start, detector have
power blackout compensation function to replace the power blackout compensation function of local
air conditioner when use group control net; When power restored after blackout, air conditioner can
automatically restart with different delay according to basic running status before power blackout.
C. Two-unit Switchover Function
To increase operation reliability of air conditioner, detector is equipped with two-unit switchover
function, and the internal dialing switch of detector set single-unit operation mode or two-unit
switchover mode. When select single unit mode, detector controls unit A according to commands
from previous unit. When select two-unit mode, unit A and unit B have absolutely equal position in
realizing two-unit switchover function.
47