Remote Control Inputs; Front Desk Control; Vent Control - Fujitsu ASU9CQ Operating Manual

REMOTE CONTROL INPUTS
The C, R, GL, W2, Y IW1, BIO, and GH terminaLs provide controL
inputs for a "manufacturer-approved" remote waLL mounted
thermostat. The "B" terminaL can be configured to become "0"
if needed see Configuration Settings For remote controL thermo ­
stat operation, refer to the Remote Thermostat Operation
section.
FRONT DESK CONTROL (FD1, FD2, EH , IN)
The FD1, FD2, EH and IN terminaLs provide controL inputs for a
front desk switch. Shorting across the FD1 and FD2 terminaLs will
dis~bLe
unit operation. The onLy controL function which wiLL
remain active when these terminaLs are shorted is freeze protec ­
tion. Any switch which wiLL produce a short circuit across these
two terminaLs can be used as a front desk switch. The contact
resistance of the switch, when closed, must be Less than 200
ohms for the front desk feature to operate properLy. TabLe 3
shows the maximum wire Length and corresponding gage size for
installation of a front desk switch. The following figure shows a
wiring schematic for connecting the front desk switch to the
unit.
If the unit is configured for wired unrented setback energy
management (see Configuration Settings section c2), EH and IN
terminaLs are used instead of FD1 and FD2. If EH and IN are
shorted, the unit wiLL go into setback temperatures for cooLing
and heating as configured in c3 and c4 (see Configuration
Settings). Unit operation will be disabLed. "Fd" (see Diagnostic
Codes) wiLL appear on the dispLay. This allows the room to quickLy
recover to a comfortabLe temperature when the room is occu ­
pied.
Table 3 - Maximum Wire Length for
Front Desk Switch
=­
I~~~I
DS1 052 MSl M52 EM IN LS FOl F02 TF- IF+ C R Gl W2 YN/I B GH
iCT!
M2
8
o
IAT
BLACK
~
O,
FRONT
1d
fl
DESK
'----_ _-..J1 SWITCH
Front Desk Switch Wiring Schematic
No holes are permitted in chassis basepan or
walisleeve when routing low voltage wire. Route the
low voltage wires through the indention on the front
of the basepan.
Low Voltage Wires Routing
VENT CONTROL
The vent controL allows outside air to be drawn into the
conditioned area. This outside air can provide ventilation when
the bLower is operating, but it wiLL increase the heating or
cooLing Load and operating costs.
To obtain access to the vent controL:
1. Remove the cabinet front (see Front RemovaL).
2. Remove the shipping screw (if instaLLed) from the vent door.
3. Remove the LabeL (if present) from over the vent controL
Lever on the Left side of the chassis. Remove the vent door
shipping screw.
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