10
31-5000493 Rev. 4
Step 2 - Mounting the Unit (Cont.)
G.
Continued.
Installation Instructions
H.
External Static Pressure Setting
Using Wired Controller
Wired controller- QACT17A settings
1.
After backlight is lit at the wired controller off, press
and hold
FAN
and
TEMP +
button for 10 seconds.
2.
The static pressure selection will appear in the upper
right hand corner.
3.
The parameter value of ESP grades can be adjusted
by pressing
TEMP+
or
TEMP-
buttons.
4.
Press
FAN
button to confirm the change.
ESP Level
(ESP grade)
External Static Pressure
USYM09/12/18UCDSA
USYM24/30/36UCDDA
USYM42/48UCDDA
1
0.10 in WC.
0.12 in WC.
2
0.15 in WC.
0.20 in WC.
3
0.20 in WC.
0.28 in WC.
4
0.28 in WC.
0.32 in WC.
5
0.36 in WC.
0.36 in WC.
6
0.40 in WC.
0.40 in WC.
7
0.44 in WC.
0.44 in WC.
8
0.48 in WC.
0.48 in WC.
9
0.52 in WC.
0.52 in WC.
10
0.60 in WC.
0.60 in WC.
Use the Up and Down Arrow buttons to adjust the
static pressure level numbers. Then press the Set
button to confirm.
G.
Route the 14AWG stranded 4-conductor power/
communication cable and the wired remote cable to the
air handler. Be sure to secure wire using strain relief. Use
reducing washers and appropriate connector to attach the
power/communication cable to the unit. The wired remote
cable will enter the unit through a rubber grommet. The 4
conductor cable connects to the terminal block at terminals
1(L1), 2(L2), 3(C) and Ground. The wired remote cable
connects to the air handler main board at connector CN1
(ABC). Re-install electrical box cover.
F.
Connect the grey flexible drain hose supplied to the
condensate pump discharge pipe. Tighten the clamp
securely. Using 3/4 “ PVC (not provided), connect the
flexible hose to the building’s condensate drain system.
E.
Cont.
Tighten the flares with a torque wrench and back-up
wrench as defined by the table below.
Forced fastening without careful centering will damage the
threads and cause a refrigerant leak.
Pipe Diameter (ø)
Fastening torque
1/4”
18N.m/13.3Ft.lbs
3/8”
42N.m/30.1Ft.lbs
1/2”
55N.m/40.6Ft.lbs
5/8”
75 N.m/55.3 Ft.lbs
3/4”
115 N.m/84.8 Ft.lbs
