4
106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
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 4 ‘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 1-2: Dimensions (See Figures 1-3, 1-4, and 1-6)
Dimension
Boiler Model
APX425C APX525C APX625C APX725C APX825C
A - Inch
(mm)
31-3/16
(792)
46-1/2
(1,181)
49-1/2
(1,258)
49-1/2
(1,258)
53-5/16
(1,258)
B - Inch
(mm)
5-1/2
(140)
N/A N/A N/A N/A
C - Inch
(mm)
12-3/8
(314)
21-5/16
(541)
23-1/4
(591)
23-1/4
(591)
23-7/16
(596)
D - Inch
(mm)
23
(584)
34-13/16
(884)
38-1/16
(967)
38-1/16
(967)
41-3/16
(1,046)
E - Inch
(mm)
15-1/8
(384)
28-5/16
(719)
30-7/8
(784)
30-7/8
(784)
32-9/16
(827)
Gas Inlet G - Inch 3/4 (FPT) 1 (FPT)
Return H - Inch 1-1/2 FPT 2 MPT
Supply J - Inch 1-1/2 FPT 2 MPT
PP Condensate Drain K - Inch 3/4 PVC Compression Coupling
PVC Combustion Air Connector - Inch 4
CPVC/PP/SS Vent Connector - Inch
(mm)
4
(100)
6
(150)
Table 1-1: Specifications
Specification
Boiler Model
APX425C APX525C APX625C APX725C APX825C
Altitude (ft. above sea level)
1
0-10,100 0-10,100
2
0-10,100 0-10,100
3
0-6,000
4
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 4.3 5.4 5.4 6.2
Heat Transfer Area (sq. ft.) 41.8 58.1 76.2 76.2 87.0
Approx. Shipping Weight (lb.) 316 368 458 458 500
* Optional 80 psi and 100 psi safety relief valves are available for all models.
1
Follow Instructions for High Altitude Installations above 2,000 ft. (see Appendix A)
2
APX525C LP cannot be installed above 6,000 ft.
3
APX725C LP cannot be installed above 7,800 ft.
4
APX825C natural gas cannot be installed above 6,000 ft. APX825C LP can be installed up to 10,100 ft.
1 Product Description, Specifications and Dimensional Data
To Next Page
Loading...
Need help?
General
