CIRCULATING LOOP HEAT EXCHANGER
MANUAL
PROMAX® XL
MODELS
•Installation
•Operation
•Maintenance
Fill in the Rating Pate Information Here:
MODEL NO.________________________________________
SERIAL NO.________________________________________
CAUTION
INSTALLATION DATE________________________________ |
PLEASE READ THOROUGHLY BEFORE INSTALLING AND |
||
Month |
Day |
Year |
USING THIS APPLIANCE. |
Fill in the Installation Information Here:
INSTALLER________________________________________ DISTRIBUTOR________________________________________
STREET ADDRESS__________________________________ |
STREET ADDRESS__________________________________ |
|||
|
|
|
||
CITY/STATE/ZIP_____________________________________ |
CITY/STATE/ZIP_____________________________________ |
|||
|
|
|
||
PHONE #__________________________________________ |
PHONE #__________________________________________ |
|||
|
|
|
||
|
|
|
||
|
SAVE THIS MANUAL FOR FUTURE REFERENCE. |
|
||
PRINTED IN THE U.S.A. 0804 |
www.aosmithwaterheaters1 |
.com |
PART NO. 184911-000 |
|
GENERAL INFORMATION
This manual contains instructions for the installation, operation and maintenance of the Promax® XL Heat Exchanger. Read it carefully before installing or using and keep it for future reference.
Intended Applications
The XL Series of heat exchangers provide the means to obtain an isolated source of hot water for radiant floor or wall heating, hydronic air handling units and other closed loop applications. The product line includes single wall and atmospherically vented double wall heat exchangers with two separate btuh inputs for each. The XL Series is intended for connection with the A.O. Smith Promax® SL line of gas-fired water heaters. This unit is not to be connected to pool or spa systems having highly chlorinated water.
Rating Plate
A rating plate identifying the heat exchanger will be found on the front of the unit. When referring to the heat exchanger, always have the information listed on the rating plate readily available.
Customer Responsibilities
Please take the time to read not only this manual but also the warranty sheet enclosed. Warranty of the Promax XL heat exchanger and its parts will depend on proper installation, maintenance and operation. Furthermore, the warranty shall be void if the design or structure of the heat exchanger is, or is
attempted to be, modified or altered in any way, including, but not limited to, by attaching non-Company approved appliances or equipment. The manufacturer of this heat exchanger will not be liable for any damages because of failure to comply with the installation and operating instructions outlined on the following pages. Use them as a guide to check the propriety of the heat exchanger installation. You will need to maintain the heat exchanger and water heater as outlined in their respective manuals. Equipment in this carton was inspected and verified to be in good condition at the time it left the factory. When received, a visual inspection of the equipment should be made and any damage noted on the delivery receipt. A damage claim should be filed immediately with the carrier.
ALL TECHNICAL AND WARRANTY QUESTIONS SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE HEAT EXCHANGER WAS PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO:
Repair Parts
For service or repair parts contact:
First: The Installing Contractor
Second: The local Distributor
AOSmith Water Products Company, Inc. 500 Lindahl Parkway
Ashland City, TN 37015 www.aosmithwaterheaters.com
TABLE OF CONTENTS
GENERAL INFORMATION .................................................. |
2 |
TABLE OF CONTENTS ....................................................... |
2 |
THEORY OF OPERATION .................................................. |
2 |
SELECTING EQUIPMENT .................................................. |
3 |
HEAT EXCHANGER PERFORMANCE ............................... |
4 |
TYPICAL INSTALLATION ................................................. |
5,6 |
WIRING ................................................................................ |
6 |
MOUNTING THE HEAT EXCHANGER |
|
TO WATER HEATER ........................................................ |
6,7 |
REPLACEMENT PARTS ...................................................... |
8 |
THEORY OF OPERATION
The pump on the XL unit draws water off of the top side loop connection fitting (Supply Fitting), circulates it through the primary side of the heat exchanger and back to the tank through the return connection. While passing through the heat exchanger, the water will lose from 10 to 40 degrees dependent on application. A field supplied pump on the secondary side will circulate water into the bottom fitting of the heat exchanger, out the top and through a heating distribution system such as a radiant slab or air handler. The rise in temperature for secondary side fluid is very much dependant on application but should be designed to provide 10 to 30° rise.
FIGURE 1
2
SELECTING EQUIPMENT
The Promax XL heat exchanger systems are rated at “Nominal” conditions. Their actual performance may vary significantly based on application. System design should be undertaken only by technically qualified individuals with an understanding of pumps, recirculating water piping and heating applications.
These instructions do not cover load sizing or hydronic heating requirements, but rather provide a means for selecting the correct side loop water heater and heat exchanger to provide a specific target heat output.
The RXLD Series is of vented double-wall construction for those applications where design or local codes require double isolation between fluid streams. Where applications may have a freeze potential on the secondary side piping, propylene glycol may be used to provide freeze protection.
NOTE: Ethylene glycol should not be used.
When selecting equipment for XL applications first compare the target heating capacity to the listed output for the water heaters. Prior to purchasing the water heater be sure to confirm water heater specifications with current literature for the chosen product
as specifications are subject to change. Next find the target capacity on the horizontal axis of the heat exchanger performance tables on page 4. Move vertically on the chart to find the intersection of the capacity line and desired heat exchanger outlet water temperature. This is the temperature of the fluid going to the slab, coil, etc. From this intersection the flow required for the secondary loop and the temperature drop, also referred to as “Delta T” can be determined. The “Delta T” shown is the drop in fluid temperature as it passes through the target application. Once the secondary flow rate is determined, the pressure drop for the heat exchanger can be read from the chart , see Figure 2. This should be added to the pressure drop for the rest of the system to determine pumping requirements.
The tables on page 4 show heat exchanger performance for a range of temperature differentials of 10 to 30 degrees. Some applications may not work well with high differentials.
NOTE: Not all heat exchangers will fit all models of Promax SL water heaters. Refer to the Application Table to insure compatibility.
PROMAX |
|
|
XL |
|
SL |
MODELS |
OUTPUT |
APPLICATIONS |
|
|
GCVH-40L |
29,600 |
ALL XL MODELS |
|
|
GCVT-40L |
35,500 |
ALL XL MODELS |
|
STANDARD |
GCVT-50L |
38,000 |
ALL XL MODELS |
|
VENT |
GCVX-50L |
50,050 |
ALL XL MODELS |
|
|
GCG-65L* |
49,400 |
ALL XL MODELS |
|
|
FCG-75L* |
57,000 |
ALL XL MODELS |
|
|
XGV-40L |
30,400 |
ALL XL MODELS |
|
|
XGV-50L |
32,400 |
ALL XL MODELS |
|
|
GCVH-40Q |
29,600 |
ALL XL MODELS |
|
DYNA- |
GCVT-40Q |
35,500 |
ALL XL MODELS |
|
CLEAN II |
GCVT-50Q |
38,000 |
ALL XL MODELS |
|
|
GCVX-50Q |
50,100 |
ALL XL MODELS |
|
|
GCG-65Q* |
49,400 |
ALL XL MODELS |
|
|
FCG-75Q* |
60,100 |
ALL XL MODELS |
|
DIRECT |
GDVH-40L |
30,000 |
RXLS 28 & 52 ONLY |
|
GDVH-50L |
36,000 |
ALL XL MODELS |
|
|
VENT |
|
|||
GDVH-75L* |
41,800 |
ALL XL MODELS |
|
|
|
|
|||
|
GPST-40L |
38,000 |
ALL XL MODELS |
|
POWER |
GPST-50L |
39,900 |
ALL XL MODELS |
|
VENT |
GPSX-50L |
47,500 |
ALL XL MODELS |
|
|
GPST-75L |
57,000 |
ALL XL MODELS |
|
POWER |
GPDH-40L |
30,400 |
RXLS 28 & 52 ONLY |
|
DIRECT |
GPDT-50L |
47,450 |
ALL XL MODELS |
|
VENT |
GPDX-75L |
53,200 |
ALL XL MODELS |
FIGURE 2 |
|
|
|
|
3
Loading...