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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
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