Operating instructions
drain tube downward at a slope of at least 1-in. for every 10 ft of
horizontal run. Be sure to check the drain tube for leaks.
Step 7—INSTALL FLUE HOOD
The flue hood assembly is shipped screwed to the coil panel in the
indoor blower compartment. Remove the service access panel to
locate the assembly (See Fig. 31).
NOTE: Dedicated low NO
x
models MUST be installed in Cali-
fornia Air Quality Management Districts where a Low NO
x
rule
exists.
These models meet the California maximum oxides of nitrogen
(NO
x
) emissions requirements of 40 nanograms/joule or less as
shipped from the factory.
NOTE: Low NO
x
requirements apply only to natural gas instal-
lations.
The venting system is designed to ensure proper venting. The
flue hood assembly must be installed as indicated in this
section of the unit installation instructions.
Install the flue hood as follows:
1. This installation must conform with local building codes and
with the National Fuel Gas Code (NFGC), ANSI Z223.1 (in
Canada, CAN/CGA B149.1, and B149.2) or NFPA (National
Fire Protection Association) latest revision. Refer to Provin-
cial and local plumbing or wastewater codes and other
applicable local codes.
2. Remove flue hood from shipping location (inside the blower
compartment). Place vent cap assembly over flue panel. Orient
screw holes in vent cap with holes in the flue panel.
3. Secure flue hood to flue panel by inserting a single screw on
the right side and the left side of the hood.
Step 8—INSTALL GAS PIPING
The gas supply pipe enters the unit through the access hole
provided. The gas connection to the unit is made to the 1/2-in. FPT
gas inlet on the manual shutoff or gas valve.
Install a gas supply line that runs to the heating section. Refer to
Table 3 and the NFGC for gas pipe sizing. Do not use cast-iron
pipe. It is recommended that a black iron pipe is used. Check the
local utility for recommendations concerning existing lines. Size
gas supply piping for 0.5 in. wg maximum pressure drop. Never
use pipe smaller than the 1/2-in. FPT gas inlet on the unit gas
valve.
For natural gas applications, the gas pressure at unit gas connection
must not be less than 4.0 in. wg or greater than 13 in. wg while the
Table 1—Physical Data—Unit 48GS (Continued)
UNIT SIZE 48GS 048090 048115 048130 060090 060115 060130
NOMINAL CAPACITY (ton) 444555
OPERATING WEIGHT (lb.) 415 415 415 450 450 450
COMPRESSORS
Quantity
Scroll
1
Reciprocating
1
REFRIGERANT (R-22)
Quantity (lb.)
6.0 6.0 6.0 8.0 8.0 8.0
REFRIGERANT METERING DEVICE
Orifice ID (in.)
Acutrol Device
.032 .032 .032 .030 .030 .030
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
1...17
12.3
1...17
12.3
1...17
12.3
2...17
12.3
2...17
12.3
2...17
12.3
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
3600
22
¼ (1100)
3600
22
¼ (1100)
3600
22
¼ (1100)
3600
22
¼ (1100)
3600
22
¼ (1100)
3600
22
¼ (1100)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
3...15
4.7
3...15
4.7
3...15
4.7
4...15
4.7
4...15
4.7
4...15
4.7
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor Hp (Rpm)
1600
11X10
3/4 (1075)
1600
11X10
3/4 (1075)
1600
11X10
3/4 (1075)
2000
11X10
1.0 (1075)
2000
11X10
1.0 (1075)
2000
11X10
1.0 (1075)
FURNACE SECTION*
Burner Orifice No. (Qty...Drill Size)
Natural Gas
Burner Orifice No. (Qty...Drill Size)
Propane Gas
3...38
3...46
3...33
3...42
3...31
3...41
3...38
3...46
3...33
3...42
3...31
3...41
RETURN-AIR FILTERS (in.)†
Throwaway
24X30 24X30 24X30 24X30 24X30 24X30
* Based on altitude of 0 to 2000 ft.
† Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300
ft/minute for throwaway type or 450 ft/minute for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
Fig. 8—Condensate Trap
C00009
TRAP
OUTLET
2" min.
1" min.
8