Residential Heating
CIRCULATING LOOP HEAT EXCHANGERS
The ProMax® XL circulating loop heat exchanger is designed specifically for
installation with A.O. Smith ProMax® SL (Side Loop) gas water heaters.
The combination of a ProMax SL water heater and ProMax XL heat exchanger
provides domestic hot water, and an isolated source of hot water for radiant
floor heating, hydronic air handlers and other closed loop applications.
OUTPUT OPTIONS
â– 28,000 BTU (RXLD-28 and RXLS-28)
â– 52,000 BTU (RXLD-52 and RXLS-52)
COMPACT, EFFICIENT, BRAZED PLATE HEAT EXCHANGER
â– UP TO 60% smaller than traditional shell & tube and coaxial heat exchangers
SINGLE OR DOUBLE-WALL DESIGN
â– Double-wall construction for applications requiring double isolation between fluid streams
AUXILIARY CONNECTIONS EXPAND OPTIONS
â– Plugged connections can be used as installation points for thermowells, a drain or for flushing
heat exchanger
â– Connections located on front of heat exchanger, common to primary side of heat exchanger
115V/60Hz PUMP
â– Control relay (24 volt coil) located inside wiring junction box
PROMAX SL GAS WATER HEATER OPTIONS
â– Standard Vent
â– Direct Vent
â– Power Vent
â– Power Direct-Vent
STANDARDS
â– All components UL Listed
1-YEAR LIMITED WARRANTY
â– For complete information, consult written warranty or contact A.O. Smith Water Heaters
Page 1 of 2
Revised July 2008
AOSRG46600
ARGSS00307
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Residential Heating
CIRCULATING LOOP HEAT EXCHANGERS
COIL & AIR HANDLER APPLICATION - HEAT EXCHANGER SELECTION TABLE
1400F SOURCE (TANK)
1500F SOURCE (TANK)
1600F SOURCE (TANK)
BTUH
GPM
GPM
BTUH
GPM
PD (FT.)
BTUH
PD (FT.)
PD (FT.)
MODEL
28,000
52,000
2.8
5.2
1.0
0.9
3.7
0.5
DOUBLE WALL
RXLD-28
RXLD-52
30,000
55,000
3.0
5.5
1.1
1.1
55,000
79,000
5.5
2.3
HEAT EXCHANGER
SINGLE WALL
2.8
5.2
1.1
1.7
4.3
8.5
RXLS-28
RXLS-52
0.7
1.3
36,000
60,000
68,000
95,000
6.8
9.6
28,000
52,000
3.6
6.0
HEAT EXCHANGER
RADIANT FLOOR APPLICATION - HEAT EXCHANGER SELECTION TABLE
1400F SOURCE (TANK)
1600F SOURCE (TANK)
1500F SOURCE (TANK)
BTUH
GPM
PD (FT.)
BTUH
GPM
PD (FT.)
BTUH
GPM
PD (FT.)
MODEL
DOUBLE WALL
RXLD-28
RXLD-52
28,000
52,000
48,000
82,000
4.9
8.3
3.0
2.4
65,000
5.3
4.1
1.0
0.9
6.5
2.8
5.2
110,000
11.1
HEAT EXCHANGER
0.7
1.3
50,000
84,000
98,000
8.9
6.2
SINGLE WALL
28,000
52,000
5.0
8.4
2.3
3.6
9.8
RXLS-28
RXLS-52
2.8
5.2
HEAT EXCHANGER
115,000
11.6
PROMAX SL WATER HEATER
CROSS-REFERENCE
HEAT EXCHANGER PRESSURE DROP
For Secondary Loop Flow Calculations.
PROMAX SL
WATER HEATER
MODELS
GCVH-40L
OUTPUT
29,600
38,000
50,050
49,400
57,000
STANDARD GCVT-50L
VENT
GCVX-50L
GCV-65L
FCG-75L
GDV-40L
GDVT-50L
GDV-75L
30,780
40,500
44,550
DIRECT
VENT
GPVT-40L
GPVT-50L
GPVX-50L
GPS-75L
39,000
39,500
49,400
64,000
30,400
47,450
53,200
POWER
VENT
GPD-40L
GPDX-50L
GPD-75L
POWER
DIRECT
VENT
For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Revised July 2008
Page 2 of 2
AOSRG46600
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