Midco Unipower G-Series - Manual (Page 2)

Part 1 Installation
Specifications Burner Style Power Type
Pilot Type Intermittent, Spark Ignition (Standard)
Interrupted, Spark Ignition (Optional)
Pilot Safety Instantaneous Electronic Flame Safeguard
Standard Voltage
C o n t r o l s 1 2 0 / 1 / 6 0
M o t o r 115/1/60 (except G69-115/230/1/60)
U.L. Listed-U.L.C. Listed
Table 1: Burner Specifications
1. Values given based on 0" W.C. firebox pressure, altitudes to 2,000 feet. Derate burner for
altitudes over 2,000 feet by 4% for each 1,000 feet over sea level.
2. Maximum inlet pressure both gases: 14" W.C. Refer to Section VI Piping for high
pressure.
3. Modulating and two-step burners are limited to a 3 to 1 turndown ratio.
4. Manifold pressures are approximate and will vary slightly according to job condition. See
Section VII Initial Start-Up paragraph 11.
5. Pressures are based on 25% excess combustion air.
6. SCFM=Standard Cubic Feet/Minute
*1 MBH=1,000 BTU/HR.
CAUTION: Unipower G-Series are not intended for outdoor installation and must be
protected from excessive moisture. Provide adequate clearance for service and proper
o p e r a t i o n .
■ ■ Open basements will generally allow sufficient air infiltration, so special provisions will seldom be
required. If the heating plant is located in a separate furnace room or in an unusually tight basement,
permanent means must be provided to supply an ample volume of fresh air for combustion and boiler
room ventilation. A direct opening to the outside air should be provided sized on the basis of 1/2 square
foot of free opening for each 1,000,000 BTU of burner rating when the vent connector is equipped
I Ventilation
Natural Gas
(1,000
BTU/cu.ft.)
G56
G57
G58
G69
G56P
G57P
G58P
G69P
1075
1500
1850
2500
224
313
385
521
5.0" W.C.
7.0" W.C.
6.7" W.C.
7.5" W.C.
5.0" W.C.
5.0" W.C.
6.0" W.C.
8.0" W.C.
Propane Gas
(2,500
BTU/cu.ft.) Natural Propane
Maximum
Input 1
MBTU/HR.*
Maximum
Air
SCFM 6
Model
Inlet Gas Pressure
Required 2
Natural Gas
(1,000
BTU/cu.ft.)
G56
G57
G58
G69
G56P
G57P
G58P
G69P
300
300
500
800
1 / 6
1 / 3
1 / 2
3 / 4
2.2" W.C.
4.1" W.C.
4.6" W.C.
4.2" W.C.
1.2" W.C.
2.6" W.C.
3.8" W.C.
3.3" W.C.
Propane Gas
(2,500
BTU/cu.ft.) Natural Propane
Minimum
Input 3
MBTU/HR.*
Motor HP
(3450 RPM)
42" x 18"
48" x 21"
50" x 24"
60" x 27"
Recommended
Combustion
Chamber
Size
Model
Burner Manifold
Pressure 1,4,5
Model
G56
G57
G58
G69
300
300
500
800
1075
1500
1850
2500
950
1400
1750
2375
875
1325
1650
2275
0.7
0.8
1.0
1.0
700
1325
1400
2100
Maximum Capacity in MBH at
Combination Chamber-
Back Pressure
0" W.C. .25" W.C. .50" W.C.
Minimum
Firing
Rate
MBH*
Maximum
Back
Pressure
in " W.C.
Maximum
MBH* at
Maximum
B.P.
Table 2: Maximum Capacity at Specified Back Pressures