A. O. Smith RXLD-28 User Manual
®
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
■ 28,000 BTU (RXLD-28 and RXLS-28)
■ 52,000 BTU (RXLD-52 and RXLS-52)
COMPACT, EFFICIENT, BRAZED PLATE HEAT EXCHANGER
■ UP TO 60% smaller than traditional shell & tube and coaxial heat exchangers
SINGLE OR DOUBLE-WALL DESIGN
■ Double-wall construction for applications requiring double isolation between fluid streams
AUXILIARY CONNECTIONS EXPAND OPTIONS
■ Plugged connections can be used as installation points for thermowells, a drain or for flushing
heat exchanger
■ Connections located on front of heat exchanger, common to primary side of heat exchanger
115V/60Hz PUMP
■ Control relay (24 volt coil) located inside wiring junction box
PROMAX SL GAS WATER HEATER OPTIONS
■ Standard Vent
■ Direct Vent
■ Power Vent
■ Power Direct-Vent
STANDARDS
■ All components UL Listed
1-YEAR LIMITED WARRANTY
■ For complete information, consult written warranty or contact A.O. Smith Water Heaters
June 2010R
Page 1 of 2
AOSRG46600
ARGSS00307
®
Residential Heating
CIRCULATING LOOP HEAT EXCHANGERS
COIL & AIR HANDLER APPLICATION - HEAT EXCHANGER SELECTION TABLE
0
140
F SOURCE (TANK)
0
F SOURCE (TANK)
150
0
160
F SOURCE (TANK)
BTUH GPM
30,000 3.0 1.1
55,000
36,000
60,000
5.5
3.6
6.0
DOUBLE WALL
HEAT EXCHANGER
SINGLE WALL
HEAT EXCHANGER
MODEL
RXLD-28
RXLD-52
RXLS-28
RXLS-52
BTUH
28,000 2.8 1.0
52,000
28,000
52,000
GPM
5.2
2.8
5.2
PD (FT.)
0.9
0.7
1.3
RADIANT FLOOR APPLICATION - HEAT EXCHANGER SELECTION TABLE
0
150
F SOURCE (TANK)
4.9
8.3
5.0
8.4
DOUBLE WALL
HEAT EXCHANGER
SINGLE WALL
HEAT EXCHANGER
MODEL
RXLD-28
RXLD-52
RXLS-28
RXLS-52
1400F SOURCE (TANK)
BTUH GPM PD (FT.)
28,000
52,000
28,000
52,000
2.8
5.2
2.8
5.2
1.0
0.9
0.7
1.3
BTUH GPM
48,000
82,000
50,000
84,000
HEAT EXCHANGER PRESSURE DROP
For Secondary Loop Flow Calculations
PD (FT.)
1.1
1.1
1.7
PD (FT.)
3.0
2.4
2.3
3.6
BTUH
55,000
79,000
68,000
95,000
BTUH GPM
65,000
110,000
98,000
115,000
GPM
0
F SOURCE (TANK)
160
11.1
11.6
PROMAX SL WATER HEATER
CROSS-REFERENCE
PROMAX SL
WATER HEATER
STANDARD
VENT
DIRECT
VENT
POWER
VENT
POWER
DIRECT
VENT
MODELS
GCVH-40L
GCVT-50L
GCVX-50L
GCV-65L
FCG-75L
GDV-40L
GDVT-50L
GDV-75L
GPVT-40L
GPVT-50L
GPVX-50L
GPS-75L
GPD-40L
GPDX-50L
GPD-75L
OUTPUT
29,600
38,000
50,050
49,400
57,000
30,780
40,500
44,550
39,000
39,500
49,400
64,000
30,400
47,450
53,200
5.5
2.3
6.8
9.6
6.5
9.8
PD (FT.)
3.7
0.5
4.3
8.5
PD (FT.)
5.3
4.1
8.9
6.2
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.
June 2010R
www.hotwater.com
Page 2 of 2
AOSRG46600
Loading...