FURNACE SPECIFICATIONS
14
Rev. 0
1. These furnaces are manufactured for natural gas operation. Optional LP Conversion Kits are available to convert
to propane gas.
2. When these furnaces are installed at high altitude, the appropriate High Altitude orifice kit must be applied. This is
required due to the natural reduction in the density of both the gas fuel and combustion air as altitude increases. The
kit will provide the proper design certified input rate within the specified altitude range.
3. The total heat loss from the structure as expressed in TOTAL BTU/HR must be calculated by the manufactures
method of in accordance with the "A.S.H.R.A.E. GUIDE" or "MANUAL J-LOAD CALCULATIONS" published by the
AIR CONDITIONING CONTRACTORS OF AMERICA. The total heat loss calculated should be equal to or less
than the heating capacity. Output based on D.O.E. test procedures, steady state efficiency times output.
4. Minimum Circuit Ampacity calculated as: (1.25 x Circulation Blower Amps) + I.D. Blower Amps.
MODEL
GUCA045AX30 GUCA070AX30 GUCA070AX40 GUCA090AX40 GUCA090AX50 GUCA115AX50
Btuh
Input (US)
46,000
69,000
69,000
92,000
92,000
115,000
Output (US)
42,800
64,400
64,400
86,000
85,300
106,500
Input (CAN)
46,000
69,000
69,000
92,000
90,000
115,000
Output (CAN)
42,800
64,400
64,400
86,000
85,300
106,500
A.F.U.E.
92.0%
92.0%
92.0%
92.0%
92.0%
92.0%
Rated External Static (WC)
.20 - .50
.20 - .50
.20 - .50
.20 - .50
.20 - .50
.20 - .50
Temperature Rise °F
35 - 65
35 - 65
35 - 65
35 - 65
35 - 65
35 - 65
ID Blower Pressure Switch Trip Point
-0.37
-0.37
-0.37
-0.37
-0.37
-0.37
Front Cover Pressure Switch Trip Point
-0.37
-0.37
-0.37
-0.37
-0.37
-0.37
Blower Wheel (D x W)"
11 x 6
11 x 7
11 x 9
11 x 9
11 x 9
11 x 10
Blower Horsepower
1/3
1/2
1/2
1/2
3/4
3/4
Blower Speeds
4
4
4
4
4
4
Max CFM @ 0.5 E.S.P.
1196
1406
1643
1544
2128
2029
Power Supply
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
Min. Circuit Ampacity (MCA)
9.0
8.9
8.9
8.9
13.8
14.9
Max. Overcurrent Device
15.0
15.0
15.0
15.0
15.0
15.0
Transformer (VA)
40
40
40
40
40
40
Heat Anticipator
0.7
0.7
0.7
0.7
0.7
0.7
Limit Setting °F
150
150
160
150
150
150
Aux. Limit °F.
150
150
150
150
150
160
Fan Delay Timings
On Heating
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
Off Heating *
90 secs.
90 secs.
90 secs.
90 secs.
90 secs.
90 secs.
On Cooling
5 sec.
5 sec.
5 sec.
5 sec.
5 sec.
5 sec.
Off Cooling
45 secs.
45 secs.
45 secs.
45 secs.
45 secs.
45 secs.
Gas Supply Pressure (Nat/LP)
7" / 11"
7" / 11"
7" / 11"
7" / 11"
7" / 11"
7" / 11"
Manifold Pressure (Nat/LP)
3.5 " / 10"
3.5 " / 10"
3.5 " / 10"
3.5 " / 10"
3.5 " / 10"
3.5 " / 10"
Orifice Size (Nat/LP)
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
Number of Burners
2
3
3
4
4
5
Vent Connector Diameter
2"
2"
2"
2"
2"
2"
Combustion Air Connector Diameter
2"
2"
2"
2"
2"
2"
Shipping Weight (lbs.)
131
144
152
166
175
187
* Off Heating - This fan delay timing is adjustable (60, 90, 120 or 180 seconds). 90 seconds as shipped.
