Installation guide

9
Plug the supplied 4 wire harness and the
supplied 2 blue wires into their matching
connectors in the SZLCD electronic control
box.
b. Connect the previously run +12 Vdc supply
wire to the red wire from the SZLCD elec-
tronic control box.
c. Connect the previously run –12 Vdc supply
wire to both the black wire from the SZLCD
electronic control box and to wire of the three
wire cable that goes to the thermostat 12V–
terminal.
d. Connect the previously run furnace thermo-
stat wires (if applicable) to the blue wires
coming from the SZLCD electronic control
box.
e. Connect the red/white wire from the SZLCD
electronic control box to wire of the three wire
cable that goes to thermostat 12V+ terminal.
f. Connect the orange wire from the SZLCD
electronic control box to wire of the three
wire cable that goes to thermostat COMMS
terminal.
I. Installing Unit
1. Install the SZLCD electronic control box
on the ceiling template as shown in FIG.
11. Drive two (2) #6 x 3/8″ blunt point Phil-
lips head screws (provided) through the ceil-
ing template into holes in the SZLCD elec-
tronic control box to hold into place. See
(FIG. 11).
6 Pin Connector
Ceiling
Template
Mounting
Screws
SZLCD
Electronic
Control
Box
FIG. 11
2. Install ceiling template by sliding lower duct over
upper duct. See (FIG. 12).
3. Hold the ceiling template up to the roof opening.
a. Start each mounting bolt through the ceiling
template and up into the unit base pan by
hand. See (FIG. 12).
Unit Return Air
Opening
Slide Lower Air
Discharge Duct
Over Upper Duct
Roof Gasket
Mounting
Bolt
Finger
Tight
Tighten to com-
press gasket to
1/2"
FIG. 12
b.  Tighten mounting bolts to
correct torque specications. Overtighten-
ing could damage unit’s base pan or ceiling
template. Not enough torque will allow an in-
adequate roof seal, and could cause a leak.
Tighten all three (3) mounting bolts EVENLY
within 40 to 50 inch pounds. See (FIG. 12).
This will compress the roof gasket to
approximately 1/2″.
J. Air Distribution Box Installation
1. Remove the two lter-grilles from the air distribu-
tion box.
2. Slide the air distribution box over the ceiling tem-
plate.
3. Install the four (4) sharp pointed screws through
the air distribution box legs and into the pre-
punched holes in ceiling template.
There are four optional mounting holes on
the outer edge of the return air opening
for which no screws are provided. These
are only required where an uneven ceil-
ing does NOT allow proper tting of the air
distribution box.
4. Install the lter-grilles by pushing them into
place. See (FIG. 13).
INSTALLATION PROCEDURE