9
17 1/4”
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
(438)
C06027
Fig. 12 -- Economizer Filter Installation
6. Caulk the ends of the joint betwe en the unit top panel
and the hood top.
7. Replace the filter access panel.
Step 9 — Install Flue Hood
Flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove from shipping
loca tion and using screws provided, install flue hood and
screen in location shown in Fig. 13.
BLOWER
ACCESS
PANEL
C07081
Fig. 13 -- Flue Hood Details
Step 10 — Install Gas Piping
Installation of the gas piping must be accordance with
loca l building codes and with applicable national codes.
In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel
Gas Code (NFGC). In Canada, installation must be
accordance with the CAN/CSA B149.1 and CAN/CSA
B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel
at elevations up to 2000 ft (610 m) above sea le vel. Unit
may be field converted for operation at elevations above
2000 ft (610 m) and/or for use with liquefied petroleum
fuel. See accessory kit installation instructions regarding
these accessories.
For natural gas applications, gas pressure at uni t gas
connec tion must not be less than 4 in. wg (996 Pa) or
greater than 13 in. wg (3240 Pa) while the unit is
operating. On 48TCFA04--A06 (high--heat) uni ts, the gas
pressure at unit gas c onnection must not be less than 5 in.
wg (1245 Pa) or greater than 13 in. wg (3240 Pa) while
the unit is operating. For liquified petroleum applications,
the gas pressure must not be less than 11 in. wg (2740 Pa)
or greater than 13.6 in. wg (3390 Pa) at the unit
connec tion.
The gas supply pipe enters the unit a t the burner access
panel on the front side of the unit, through the long slot at
the bottom of the access panel. The gas connection t o the
unit is made to the 1/2--in. FPT gas inlet port on the unit
gas valve
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage
to equipment.
When connecting the gas line to the unit gas valve ,
the installer MUST use a backup wrench to prevent
dama ge to the valve .
CAUTION
!
Install a gas supply line that runs to the unit heating
section. Refe r to the NFPA 54/NFGC or equivalent code
for gas pipe sizing data. Do not use a pipe size smaller
than 1/2--in. Size the gas supply line to allow for a
maximum pressure drop of 0.5--in wg (124 Pa) between
gas regul ator source and unit ga s valve connection when
unit is operating at high--fire flow rate.
The gas supply line can approach the unit in three ways:
horizontally from outside the uni t (across the roof),
thru--curb/under unit basepan (accessory kit required) or
through unit basepan (factory--option or accessory kit
required). Consult accessory kit installation instructions
for details on t hese installati on methods.
Factory--Option Thru--Base Connections —
This service connection kit consists of a 1/2 -- in NPT gas
adapter fitting (brass), a 1/2--in electrical bulkhead
connector and a 3/4--in electrical bulkhead connector, all
factory--installed in the embossed (raised) section of the
unit basepan in the condenser section.
LOW VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3 TO 6 TON UNITS.
STAINLESS STEEL FITTING FOR 7 1/2 TO 12 1/2 TON.
HIGH VOLTAGE
CONDUIT
CONNECTOR
C08015
Fig. 14 -- Fittings
48TC
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