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Installation Instructions
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)
1/4"
3/8"
1/2"
5/8"
3/4"
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.
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.
10
Step 2 - Mounting the Unit (Cont.)
Fastening torque
18N.m/13.3Ft.lbs
42N.m/30.1Ft.lbs
55N.m/40.6Ft.lbs
75 N.m/55.3 Ft.lbs
115 N.m/84.8 Ft.lbs
G.
Continued.
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
External Static Pressure
(ESP grade)
USYM09/12/18UCDSA
USYM24/30/36UCDDA
1
0.10 in WC.
2
0.15 in WC.
3
0.20 in WC.
4
0.28 in WC.
5
0.36 in WC.
6
0.40 in WC.
7
0.44 in WC.
8
0.48 in WC.
9
0.52 in WC.
10
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.
USYM42/48UCDDA
0.12 in WC.
0.20 in WC.
0.28 in WC.
0.32 in WC.
0.36 in WC.
0.40 in WC.
0.44 in WC.
0.48 in WC.
0.52 in WC.
0.60 in WC.
31-5000493 Rev. 4
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