BLOWER OFF-DELAY
J2 JUMPER
TWINNING AND/OR
COMPONENT TEST
TERMINAL
24-V THERMOSTAT
TERMINALS
3-AMP FUSE
LED OPERATION &
DIAGNOSTIC LIGHT
115-VAC(L2)
CONNECTIONS
ob
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX.)
TRANSFORMER 24-VAC
CONNECTIONS
PL1-LOW VOLTAGE MAIN
HARNESS CONNECTOR
A02100
A plugged drain connection has been provided on this fitting
fbr use when moisture is fbund in combustion-air intake pipe
and combustion box If use of this drain connection is desired,
&ill out fitting's tap plug with a 3/16-in. &ill and connect a
field-supplied 3/8-in. robe. This tube should be routed to open
condensate &ain for furnace and AiC (if used), and should be
tIapped. (See Fig. 36.)
Vent Pipe
NOTE: Furnace vent pipe connections are sized for 2-in. pipe.
Any vent pipe size change should be made outside furnace casing
in vertical pipe. (See Fig. 37.) This allows proper &ainage of vent
condensate.
Detem_ine vent pipe diameter and maximm_a pipe lengths using
Table 8
Furnace vent pipe connection must be attached as shown in Fig.
34. Inducer housing alternate vent cap may need to be relocated in
some applications.
NOTE: Starting at furnace, slope vent pipe a minimum of 1/4 in
per linear ft upward to termination(s) with no sags between
hangers.
UNIT MAY NOT OPERATE
Failure to %ltow this caution may result in intem_ittent unit
operation.
When vent pipe is exposed to temperatures below fi'eezing,
such as when it passes through an unheated space or when a
chimney is used as a raceway, pipe must be insulated as
described in Table 9 with Am_aflex-type insulation
An abandoned masonry chimney may be used as a raceway %r
properly insulated and supported vent pipe Each furnace must
have its own vent pipe and be terminated individually, as shown in
Fig. 41.
Other gas appliances wit}* their own venting system may also use
the abandoned chimney as a raceway providing it is permitted by
local code, the curt'out edition of d_e National Fuel Gas (7ode and
the vent or liner manufi_cmrer's installation instl-uctions. Care must
be taken to prevent the exhaust gases fi'om one appliance from
contaminating the combustion air of other gas appliances.
32
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