8
3.7 UNIT MOUNTING
If elevating the condensing unit, either on a flat roof or on a slab, observe the
following guidelines.
•
The base pan provided elevates the condenser coil 3/4” above the base pad.
•
If elevating a unit on a flat roof, use 4” x 4” (or equivalent) stringers positioned
to distribute unit weight evenly and prevent noise and vibration.
3.8 FACTORY-PREFERRED TIE-DOWN METHOD
INSTRUCTIONS:
IMPORTANT:
These instructions are intended as a guide to securing equipment for wind-
load ratings of “120 MPH sustained wind load” and “3-second, 150 MPH gust.” While this
procedure is not mandatory, the Manufacturer does recommend that equipment be prop-
erly secured in areas where high wind damage may occur.
STEP 1: Before installing, clear pad of any dirt or debris.
IMPORTANT:
The pad must be constructed of industry-approved materials, and
must be thick enough to accommodate the concrete fastener.
STEP 2: Center basepan on pad, ensuring it is level.
STEP 3: Remove unit top panel by removing screws around the perimeter of top panel.
Disconnect fan motor leads from contactor and lay top panel aside taking care
not to damage the fan.
STEP 4: Drill 4 or 6 holes (1/4” diameter) in the unit basepan
only
per figure 2.
STEP 5: Select and obtain appropriate concrete or lag screws and flat washers per
figure 2.
STEP 6: Drill pilot holes in pad through the basepan clearance holes drilled in Step 4,
ensuring that the holes are at least
1
⁄
4
” deeper than the concrete fastener being
used. Use the concrete screw or lag screw manufacturer’s recommended hole
diameter for the pilot holes.
STEP 7: Drive concrete screws or lag screws through
1
⁄
4
” clearance holes in unit basepan
and into the pad. Use flat washers under the head of the screws. Snug screws
to basepan.
NOTE:
Do not over-tighten the concrete or lag screws. Doing so can weaken or strip
the fastener and cause it to break or pull out.
STEP 8: Re-connect fan motor wire leads to contactor per the unit wiring diagram and
lower unit top onto the unit. Take care to place the fan motor wire conduit in the
slot in the top of the control box as the top is lowered onto the unit. Re-install
screws that attach unit top to the unit.
STEP 9: Finish unit installation per Sections 4 – 16 in this manual.
4.0 REFRIGERANT CONNECTIONS
All units are factory charged with Refrigerant 410A. All models are supplied with
service valves. Keep tube ends sealed until connection is to be made to prevent
system contamination.
5.0 TOOLS REQUIRED FOR INSTALLING &
5.0
SERVICING R-410A MODELS
Manifold Sets:
-Up to 800 PSIG High Side
-Up to 250 PSIG Low Side
-550 PSIG Low Side Retard
Manifold Hoses:
-Service Pressure Ratiing of 800 PSIG
Recovery Cylinders:
-400 PSIG Pressure Rating
-Dept. of Transportation 4BA400 or BW400
!
CAUTION
R-410A systems operate at higher pressures than R-22 systems. Do not use
R-22 service equipment or components on R-410A equipment.
