Applied Control Of Outdoor Unit; Outdoor Fan High Static Pressure Shift - Toshiba MMY-MUP0721FT6P-UL Service Manual

6-2. Applied Control of 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 available by setting relevant switches provided on the interface P.C.
board of the outdoor unit.

6-2-1. Outdoor Fan High Static Pressure Shift

Setup
Change the outdoor DN code. (O.DN [19]) into "Outdoor Fan High Static Pressure operation."
This function must be enabled with every discharge duct connected outdoor unit for both of the header and
follower units.
Purpose/characteristics
Outdoor DN Code
(O.DN) Setting
Operation
O.DN [19] = 0000 Normal operation
O.DN [19] = 0001 Outdoor Fan High Static Pressure operation
Specifications
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 0.061 In WG (15 Pa) is to be used, enable this function. The maximum external static
pressures of single units are shown below (Table 1). In the case of combined use of multiple outdoor units,
set all the units to the same maximum external static pressure as the one with the lowest maximum external
static pressure.
Table 1: Maximum External Static Pressures of Single Outdoor Units
Standard model MMY-MUP
Maximum external static pressure
(*)Outdoor unit air flow (CFM)
High heat model MMY-MUP
Maximum external static pressure
(*)Outdoor unit air flow (CFM)
( ) Calculate duct resistance from outdoor unit air flow.
Operation
0721 0961
0.32inWG(80Pa) 0.32inWG(80Pa)
5721 6357
072H1 096H1
0.32inWG(80Pa) 0.32inWG(80Pa)
5721 7240
- 95 -
1201 1441
0.32inWG(80Pa) 0.32inWG(80Pa)
7416 7981
120H1
0.32inWG(80Pa)
7416
1681 1921
0.32inWG(80Pa) 0.32inWG(80Pa)
8476 9712