8
ELECTROSTATIC DISCHARGE (ESD)
PRECAUTIONS
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit
components.
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and servicing
to protect the furnace electronic control. Precautions will
prevent 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.
CAUTION
!
3. Disconnect all power to the furnace. Multiple disconnects
may be required. DO NOT TOUCH THE CONTROL OR
ANY WIRE CONNECTED TO THE CONTROL PRIOR
TO DISCHARGING YOUR BODY’S ELECTROSTATIC
CHARGE TO GROUND.
4. Firmly touch a clean, unpainted, metal surface of the fur-
nace chassis which is close to the control. Tools held in a
person’s hand during grounding will be satisfactorily dis-
charged.
5. 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 ungroun-
ded objects, etc.).
6. If you touch ungrounded objects (recharge your body with
static electricity), firmly touch furnace again before touch-
ing control or wires.
7. Use this procedure for installed and uninstalled (ungroun-
ded) furnaces.
8. 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 con-
trol or yourself into contact with the furnace. Put all used
AND new controls into containers before touching un-
grounded objects.
9. An ESD service kit (available from commercial sources)
may also be used to prevent ESD damage.
INTRODUCTION
The model 355BAV Direct Vent, Upflow, Gas--Fired, Category IV,
condensing furnace is available in model sizes ranging in input
capacities of 60,000 to 120,000 Btuh.
APPLICATIONS
General
Some assembly and modifications are required for condensate trap
drainage tubes. (See Fig. 6, 7 and 8.) All drain and pressure tubes
are connected as shown in Fig. 7 from the factory. See appropriate
application instructions for these procedures.
MINOR PROPERTY DAMAGE
Failure to follow this caution may result in minor property
damage.
Local codes may require a drain pan under entire furnace
and condensate trap when a condensing furnace is used in
an attic application or over a finished ceiling.
CAUTION
!
NOTE
: In Canada, installations shall be in accordance with
current NSCNGPIC and/or local codes.
Upflow Application Only
An upflow furnace application is where furnace blower is located
below combustion and controls section of furnace, and conditioned
air is discharged upwards.
Condensate Trap (Factory--Shipped location)
The condensate trap is factory installed in the blower shelf. A
factory--supplied tube is used to extend the condensate trap drain
connection to the desired furnace side for field drain attachment.
See Condensate Trap Tubing section for drain tube extension
details. (See Fig. 6.)
Condensate Trap Tubing (Factory--Shipped configura-
tion)
NOTE
: See Fig. 7 or review label on main furnace door to
confirm location of these tubes.
1. Collector Box Drain, Inducer Housing Drain, Relief Port,
and Pressure Switch Tubes
These tubes should be factory attached to condensate trap
and pressure switch ready for use in internal trap applica-
tions. These tubes can be identified by their connection
location and also by a color label on each tube. These tubes
are identified as follows: collector box drain tube (blue la-
bel), inducer housing drain tube (violet label or molded), re-
lief port tube (green label), and pressure switch tube (pink
label).
2. Condensate Trap Drain Tube
The condensate trap drain connection must be extended for
field attachment by doing the following:
f. Determine location of field drain connection. (See Fig. 2
or 7.)
NOTE
: If internal filter or side filter/media cabinet is used, drain
tube should be located to opposite side of casing from return duct
attachment to assist in filter removal.
g. Remove and discard casing drain hole plug button from
desired side.
h. Install drain tube coupling grommet (factory--supplied
in loose parts bag) in selected casing hole.
i. Slide drain tube coupling (factory--supplied in loose
parts bag) through grommet so long end of coupling
faces blower.
j. Cement 2 factory--supplied 1/2--in. street CPVC elbows
to rigid drain tube connection on condensate trap. (See
Fig. 7.) These elbows must be cemented together and
cemented to condensate trap drain connection.
355B
A
V
