ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and servicing to
protect the furnace electronic control. Precautions will pre-
vent electrostatic discharges from personnel and hand tools
which are held during the procedure. These precautions will
help to avoid exposing the control to electrostatic discharge
by putting the furnace, the control, and the person at the same
electrostatic potential.
1. Disconnect all power to the furnace. DO NOT TOUCH THE
CONTROL OR ANY WIRE CONNECTED TO THE CON-
TROL PRIOR TO DISCHARGING YOUR BODY’S ELEC-
TROSTATIC CHARGE TO GROUND.
2. Firmly touch a clean, unpainted, metal surface of the furnace
chassis which is close to the control. Tools held in a person’s
hand during grounding will be satisfactorily discharged.
3. After touching the chassis you may proceed to service the
control or connecting wires as long as you do nothing that
recharges your body with static electricity (for example; DO
NOT move or shuffle your feet, DO NOT touch ungrounded
objects, etc.).
4. If you touch ungrounded objects (recharge your body with
static electricity), firmly touch furnace again before touching
control or wires.
5. Use this procedure for installed and uninstalled (ungrounded)
furnaces.
6. Before removing a new control from its container, discharge
your body’s electrostatic charge to ground to protect the
control from damage. If the control is to be installed in a
furnace, follow items 1 through 5 before bringing the control
or yourself into contact with the furnace. Put all used AND
new controls into containers before touching ungrounded
objects.
7. An ESD service kit (available from commercial sources) may
also be used to prevent ESD damage.
Table 1—Dimensions (In.)
UNIT SIZE
A
D
E
VENT CONN
SHIP. WT (LB)
070-08
14-3/16
12-9/16
12-11/16
4
123
070-12
14-3/16
12-9/16
12-11/16
4
126
091-14
17-1/2
15-7/8
16
4
142
111-16
21
19-3/8
19-1/2
4
165
136-20
24-1/2
22-7/8
23
5
188
155-20
24-1/2
22-7/8
23
5
196
→
Fig. 1—Dimensional Drawing
A00210
A
D
13
⁄
16
″
E
11
⁄
16
″
11
⁄
16
″
28
1
⁄
2
″
39
7
⁄
8
″
24
5
⁄
16
″
11
⁄
16
″
3
″
2
1
⁄
16
″
1
″
12
5
⁄
16
″
5
3
⁄
8
″
5
13
⁄
16
″
2
3
⁄
8
″
AIR INLET
7
⁄
8
-IN. DIA HOLE
POWER ENTRY
7
⁄
8
-IN. DIA
ACCESSORY
1
3
⁄
4
-IN.
DIA HOLE
GAS ENTRY
1
⁄
2
-IN. DIA HOLE
THERMOSTAT
WIRE ENTRY
SIDE INLET
VENT CONN
1. Two additional
7
⁄
8
-in. dia holes are located in the top plate.
2. Minimum return-air openings at furnace, based on metal duct. If flex duct is used,
see flex duct manufacturer's recommendations for equivalent diameters.
a. For 800 CFM–16-in. round or 14
1
⁄
2
x 12-in. rectangle.
b. For 1200 CFM–20-in. round or 14
1
⁄
2
x 19
1
⁄
2
-in. rectangle.
c. For 1600 CFM–22-in. round or 14
1
⁄
2
x 23
1
⁄
4
-in. rectangle.
d. For airflow requirements above 1800 CFM, see Air Delivery table in Product Data literature for specific
use of single side inlets. The use of both side inlets, a combination of 1 side and the bottom, or the
bottom only will ensure adequate return air openings for airflow requirements above 1800 CFM.
NOTES:
5
3
⁄
8
″
5
13
⁄
16
″
2
3
⁄
8
″
2
11
⁄
16
″
1
″
2
1
⁄
16
″
19
″
13
⁄
16
″
7
⁄
8
-IN. DIA
POWER ENTRY
AIRFLOW
OUTLET
1
1
⁄
2
-IN.
DIA
R.H. GAS ENTRY
7
⁄
8
-IN. DIA ACCESSORY
1
⁄
2
-IN. DIA THERMOSTAT
WIRE ENTRY
SIDE INLET
14
1
⁄
2
″
1
″
23
1
⁄
4
″
SIDE RETURN
DUCT LOCATION
1
1
⁄
4
″
TYP 1
″
5
⁄
8
″
TYP
2
