AHRI APEX, Installation, Operating And Service Instructions

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I. Product Description, Specifications and Dimensional Data
Apex Series boilers are condensing high efficiency gas-fired
direct vent hot water boilers designed for use in forced hot
water space or space heating with indirect domestic hot
water heating systems, where supply water temperature
does not exceed 210°F. These boilers have special coil
type stainless steel heat exchangers, constructed, tested and
stamped per Section IV ‘Heating Boilers’ of ASME Boiler
and Pressure Vessel Code, which provide a maximum heat
transfer and simultaneous protection against flue gas product
corrosion. These boilers are not designed for use in gravity
hot water space heating systems or systems containing
significant amount of dissolved oxygen (swimming pool
water heating, direct domestic hot water heating, etc.).
Table 1B: Dimensions (See Figures 1A, 1B, 1C and 1D)
Dimension
Boiler Model
APX425 APX525 APX625 APX725 APX825
A - Inch
(mm)
28-7/8
(734)
44-7/8
(1140)
50-1/4
(1276)
50-1/4
(1276)
54-9/16
(1384)
B - Inch
(mm)
6-3/16
(157)
22-1/8
(562)
N/A N/A
28-3/8
(724)
C - Inch
(mm)
13-1/16
(332)
29
(737)
24
(610)
24
(610)
34-1/4
(876)
D - Inch
(mm)
23-3/4
(602)
39-11/16
(1008)
38-7/8
(987)
38-7/8
(987)
48-1/16
(1226)
E - Inch
(mm)
15-13/16
(402)
29-3/8
(752)
31-5/8
(803)
31-5/8
(803)
33-13/16
(864)
Gas Inlet F
(FPT)
3/4” 3/4” 1” 1” 1”
Return G 1-1/2” (FPT) 2” (MPT) 2” (MPT) 2” (MPT)
Supply H 1-1/2” (FPT) 2” (MPT) 2” (MPT) 2” (MPT)
Condensate Drain J
Factory Provided Socket End Compression Pipe Joining Clamp for 3/4” Schedule 40
PVC Pipe
Boiler Two-Pipe
CPVC/PVC Vent Connector
(Figures 1A, 1B, 1C and 1D) -
Inch
4 x 4 6 x 6 6 x 6 6 x 6
Table 1A: Specifications
Specification
Boiler Model
APX425 APX525 APX625 APX725 APX825
Altitude (ft. above sea level) 0-4500 0-4500 0-2000 0-2000 0-4500
Fuel
Shipped for Natural Gas, Field
Converted for LP Gas
Shipped for Natural Gas or Shipped for LP Gas
(no Field Conversion)
Max. Allowable Water Temperature (°F) 210 210 210 210 210
Max. Allowable Working Pressure (psi) 160 160 160 160 160
Factory Supplied Safety Relief Valve (psi)
*
50 50 60 60 60
Boiler Water Volume (gal.) 3.4 4.2 5.5 5.5 5.0
Heat Transfer Area (sq. ft.) 41.8 50.8 76.2 76.2 65.3
Approx. Shipping Weight (lb.) 304 350 455 455 430
*
Optional 80 psi and 100 psi safety relief valves are available for all models.