Applied Control And Functions; Applied Control For Outdoor Unit; Outdoor Fan High Static Pressure Shift; Priority Operation Mode Setting - Toshiba MMY-MAP0724HT6UL Service Manual

7

Applied Control and Functions

7-1. Applied control for outdoor unit

The outdoor fan high static pressure support and priority operation mode setting (cooling / heating / number of units
/ or priority indoor unit) functions are made available by setting relevant switches provided on the interface P.C.
board of the outdoor unit.

7-1-1. Outdoor fan high static pressure shift

Purpose / characteristics
This function is used when connecting a duct to the discharge port of an outdoor unit (as part of, for example, unit
installation on the floor by floor installation.)
Setup
Turn ON the DIP switch [SW10, Bit 2] provided on the interface P.C. board of the outdoor unit.
This function must be enabled with every discharge duct connected outdoor unit for both of the header and follower
units.
Specification
Increase the speed of the propeller fan units on the outdoor fan to allow the installation of a duct with a maximum
external static pressure not greater than specified in the table below. If a discharge duct with a resistance greater
than 0.06 InWG (15 Pa) is to be used, enable this function. The maximum external static pressures of base units
are shown below (Table 1).
Table 1: Maximum External Static Pressures of Base Outdoor Units
Model
Maximum external static pressure
(*) Outdoor unit air flow
(*) Calculate duct resistance from outdoor unit air flow.

7-1-2. Priority operation mode setting

Purpose / characteristics
This function allows switching between priority cooling and priority heating.
Four patterns of priority operation mode setting are available as shown in the table below. Select a suitable priority
mode according to the needs of the customer.
Setup
CAUTION
In the case of the priority indoor unit mode, it is necessary to set up the specific indoor unit chosen for priority operation
(a single unit only).
(1) Outdoor unit setup method (header unit)
SW11
Bit 1 Bit 2
OFF OFF
ON OFF
OFF ON
ON ON
MMY- MAP0724HT6UL
0.2 InGW (50 Pa)
(CFM) 5800
Priority heating (factory default)
Priority cooling
Priority operation based on No. of units in operation (priority given to the operation mode with the
largest share of units in operation)
Priority indoor unit (priority given to the operation mode of the specific indoor unit set up for priority
operation)
MAP0964HT6UL
0.2 InGW (50 Pa)
6600
Operation
48
MAP1144HT6UL
0.2 InGW (50 Pa)
7060