INDIRECT-FIRED WATER HEATER A Spanish language version of these instructions is available by contacting the manufacturer listed on the rating plate. La version espanola de estas instruccions se puede obtener al escribirle a la fábrica cuyo nombre aparece in la placa de especificaciones. WARNING To avoid damage or injury, there must be no materials stored against the indirect water heater and proper care shall be taken to avoid unnecessary contact (especially by children) with the indirect water heater.
CONGRATULATIONS! You have just purchased one of the finest water heaters on the market today! This installation, operation, and instruction manual will explain in detail the installation and maintenance of your new Indirect water heater. We strongly recommend that you contact a plumbing professional for the installation of this water heater. We require that you carefully read this manual, as well as the enclosed warranty, and refer to it if questions arise.
CAUTION The maximum boiler water supply temperature to the indirect heat exchanger must not exceed 240°F (115°C). NOTICE Insulation blankets are not required for this water heater. This water heater meets or exceeds the ASHRAE/IES 90.1b standards with respect to insulation and standby loss requirements. TABLE OF CONTENTS IIIIIIIVVVIVIIVIIIIXXXI- IMPORTANT INFORMATION…………….….. SPECIFICATIONS………………………………. GENERAL INFORMATION……………………. PRE-INSTALLATION…………………………… WATER CONNECTIONS………………………..
SECTION I IMPORTANT INFORMATION -READ CAREFULLYThe equipment must be installed in accordance with those installation regulations required in the area where the installation is to be made. These regulations must be carefully followed in all cases. Authorities having jurisdiction shall be consulted before installations are made.
Important Information continued- DANGER DO NOT store or use gasoline or other flammable, combustible, or corrosive vapors and/or liquids in the vicinity of this or any other appliance. IF YOU SMELL GAS: DO NOT try to light any appliance. DO NOT touch any electric switch; do not use any telephone in your building. Immediately call your gas supplier from a telephone in another building. Follow the gas supplier’s instructions.
Important Information continued- WARNING Installation is not complete unless a pressure and temperature relief valve is installed into the side of the water heater. See the Water Connections section of this manual for details. This water heater contains very hot water under high pressure. Do not unscrew any pipe fittings or attempt to disconnect any components of this water heater without positively assuring the water is cool and has no pressure.
Important Information continued- WARNING It is the responsibility of the installing contractor to see that all controls are correctly installed and are operating properly when the installation is complete. DO NOT operate the water heater with jumpered or absent controls or safety devices. DO NOT tamper with or alter the water heater and/or controls. DO NOT operate the water heater if any external part has been under water.
SECTION II SPECIFICATIONS Figure 1 – Tank Layout Table 1: Water Heater Dimension (Inches) MODEL A 30-Gal. / Res. 22 40-Gal. / Res. 24 40-Gal. “R” / Res. 22 50-Gal. / Res. 26 50-Gal. “R” / Res. 22 65-Gal. / Res. 22 65-Gal. / Com. 22 80-Gal. / Res. 24 80-Gal. / Com. 24 120-Gal. / Com. 28-1/4 120-Gal. / Com.
Specifications continued- Table 2: Water Heater Capacities MODEL Tank Capacity (Gal) Coil Volume (Gal) 30-Gal. / Res. 40-Gal. / Res. 40-Gal. “R” / Res. 50-Gal. / Res. 50-Gal. “R” / Res. 65-Gal. / Res. 65-Gal. / Com. 80-Gal. / Res. 80-Gal. / Com. 120-Gal. / Res. 120-Gal. / Com. 30 40 38 50 48 60 58 75 73 116 114 2.7 2.7 2.7 2.7 2.7 2.7 5.0 2.7 5.0 2.7 5.
Specifications continued- Table 4: Water Heater Performance Maximum First Hour Rating (Gal/Hr) @ MODEL 140 °F 30-Gal. / Res. 40-Gal. / Res. 279 288 288 297 297 306 534 321 546 357 583 40-Gal. “R” / Res. 50-Gal. / Res. 50-Gal. “R” / Res. 65-Gal. / Res. 65-Gal. / Com. 80-Gal. / Res. 80-Gal. / Com. 120-Gal. / Res. 120-Gal. / Com. 115 °F Approximate Boiler Output Needed For Ratings (BTU/hr) 6.7 6.7 6.7 6.7 6.7 6.7 12.8 6.7 12.8 6.7 12.
Specifications continued- NOTICE If the boiler takes longer to heat up from a cold start than the water availability as noted above, hot water shortage may occur. Hot water availability is based off drawing 80% of the heated tank volume at 4 gallons per minute flow rate. The maximum heat transfer through the coil (heat input) of the water heater at 240°F boiler water supply temperature and 210°F potable water temperature is 94,100 Btu/hr for residential models and 180,300 Btu/hr for commercial models.
SECTION III GENERAL INFORMATION FEATURES This water heater contains the following features: HEAT EXCHANGER -- The heat exchanger (coil) has 1” NPT female fittings. These water heaters with single-wall heat exchangers meets the Uniform Plumbing Code for installation in all potable water systems provided that: • • • • • The boiler water (including additives) is practically non-toxic, having toxicity rating of class of 1 as listed in Clinical Toxicology of Commercial Products.
General Information continued- TEMPERATURE AND PRESSURE RELIEF VALVE WARNING Keep clear of the combination temperature and pressure relief valve discharge line outlet. The discharge may be hot enough to cause scald injury. The water is under pressure and may splash.
General Information continued- WARNING Install a discharge line so that water discharged from the temperature and pressure relief valve will exit within six (6) inches above, or any distance below, the structural floor and cannot contact any live electrical part. The discharge line is to be installed to allow for complete drainage of both the temperature and pressure relief valve and the discharge line. The discharge opening must not be subjected to blockage or freezing.
SECTION IV PRE-INSTALLATION UNPACKING INSPECT SHIPMENT carefully for any signs of damage. If damage is noted, do not install the product. Contact the shipper or manufacturer. All equipment is carefully manufactured, inspected, and packed. Our responsibility ceases upon delivery of the packaged heater to the carrier in good condition. NOTE: Any claims for damage or shortage in shipment must be filed immediately against the carrier by the consignee. IMPORTANT DECISIONS REQUIRED BEFORE INSTALLATION SIZING 1.
Pre-installation continued- NOTICE Increasing the boiler DOE heating capacity above the values listed in Table 3 will not increase the rating of the water heater. 2. Circulator Sizing – Refer to Table 5 for the corresponding pressure drop through the coil for the given model. Calculate the pressure drop of all straight pipe and fittings on the supply and return of the water heater at the selected flow rate. Add the piping/fitting pressure drop to the pressure drop through the water heater coil.
Pre-installation continued- DOMESTIC HOT WATER PRIORITY Two options are available, Priority and Non-Priority. 1. Priority – Demand for space heating is interrupted or postponed until the domestic hot water demand is satisfied. This option provides maximum delivery of domestic hot water.
Pre-installation continued- Component Location CAUTION This water heater must be located in an area where leakage of the tank, water line connections, or the temperature and pressure relief valve will not result in damage to the area adjacent to the water heater or to lower floors of the structure. When such locations cannot be avoided, a suitable drain pan must be installed under the water heater.
Pre-installation continued- Appliance Location 1. Boiler Location – Locate the indirect-fired water heater as close to the boiler as practical. 2. Fixture Locations – For fastest delivery of hot water, place the indirect-fired water heater close to points of use. Additional Recommended Components 1. Shut-off Valves – Allows isolation of water heater from domestic water system and/or boiler system during service. 2.
SECTION V WATER CONNECTIONS WARNING FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE THE MANUFACTURER FROM ANY CLAIM WHICH MIGHT RESULT FROM EXCESSIVE TEMPERATURE AND PRESSURES. Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a long period of time. HYDROGEN GAS IS EXTREMELY FLAMMABLE.
Water Connections continued- INSTALL TEMPERATURE AND PRESSURE RELIEF VALVE (if not factory installed) WARNING Temperature and pressure relief valve discharge piping must be piped near the floor to eliminate potential of severe burns. Do not pipe in any area where freezing could occur. Do not install any shut-off valves, plugs or caps to the temperature and pressure relief valve or piping. INSTRUCTIONS FOR POTABLE CONNECTIONS 1. BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE.
Water Connections continued- 4. NEVER OPERATE THE WATER HEATER WITHOUT FIRST BEING CERTAIN THAT IT IS FILLED WITH WATER. INSTRUCTIONS FOR BOILER CONNECTIONS The indirect-fired heater connection labeled “To Boiler Return” should be piped to the boiler return piping as close to the boiler as possible and especially after any flow control or check valves in the space heating return piping. The use of a union and a shut-off valve is recommended.
Water Connections continued- Figure 2 - Water Boiler Piping with Zone Valves 2. For a space heating system that utilizes CIRCULATORS, refer to Figure 3. The indirect-fired water heater connection labeled “FROM BOILER SUPPLY” should be piped to the boiler supply piping. Mount the circulator making sure the flow arrow points toward the water heater. The use of shut-off valves and unions are recommended for future service convenience.
Water Connections continued- CONNECT STEAM BOILER SUPPLY PIPING Figure 4 represents a typical steam boiler connection diagram. Refer to the boiler installation manual or contact the boiler manufacturer for an appropriate piping diagram. The use of a union, shut-off valves, and a drain valve is recommended for future service convenience. The use of an in-line “Y”-style strainer is required to prevent accumulation of sludge in the water heater’s coil.
SECTION VI ELECTRICAL CONNECTIONS Install electric wiring in accordance with National Electric Code or the Canadian Electrical Code and local regulations. See the boiler’s installation manual for wiring diagrams. DANGER Positively assure all electrical connections are unpowered before attempting installation or service of electrical components or connections of the water heater or building. Lock out all electrical boxes with padlock once power is turned off.
Electrical Connections continued- Figure 5 - Aquastat Control SECTION VII OPERATING INSTRUCTIONS WARNING Water heaters are heat-producing appliances. To avoid damage or injury there must be no materials stored against the water heater, and proper care must be taken to avoid unnecessary contact (especially by children) with the water heater.
Electrical Connections continued- SYSTEM START-UP Follow boiler installation instructions to place boiler in operation. SEQUENCE OF OPERATIONS 1. Aquastat senses stored water temperature drops below desired setting. a. Domestic hot water priority only: Normally closed contacts open to interrupt space heating. 2. Aquastat satisfied. a. Aquastat contacts open, turning off domestic hot water circulator and de-energizing relay. b.Normally open contacts open, stopping boiler operation. c.
Electrical Connections continued- Table 8 details the approximate relationship of water temperature and time with regard to scald injury and may be used as a guide in determining the safest water temperature for your applications.
Electrical Connections continued- 2. After the water heater completes a heat-up cycle, check the water temperature at a faucet. Allow enough water to flow to ensure that the water temperature reflects the tank temperature. Adjust the water heater’s temperature setting as necessary. a. Adjusting to a lower temperature setting will not immediately affect water temperature. Draw sufficient water or allow the water heater to remain idle until a heat-up cycle is initiated. Repeat step 3. b.
Maintenance continued- CAUTION Before manually operating the valve, make sure that a drain line has been attached to the valve to direct the discharge to an open drain. Failure to take this precaution could mean contact with extremely hot water discharging from the valve during this checking operation. 3.
Maintenance continued- a. Turn the water heater electricity off for the zone containing the indirect-fired heater. Flow water until the discharge is cool or allow enough time for the potable water to cool naturally. Connect a hose to the drain valve. Locate the hose’s discharge in an area where any remaining hot water will not cause any damage or injury. b. Open the drain valve to flush any sediment out of the bottom to the heater. c. Shut off the cold water supply.
SECTION IX TROUBLE SHOOTING GUIDE PROBLEM No hot water at faucet. CAUSE SOLUTION Boiler does not operate. Circulator does not operate. Improper aquastat setting or calibration. Zone valve does not open (if used). Electrical problem (relay, wiring, etc.). Scale build-up. Water at faucet too hot. Clogged cold water filter or boiler supply strainer (if used). Aquastat set too high. Improper system plumbing. Improper system wiring. 32 Refer to boiler installation instructions.
Trouble Shooting Guide continued- PROBLEM CAUSE SOLUTION Insufficient hot water. Aquastat setting too low. Undersized boiler with no priority to domestic hot water. Peak use of hot water is greater than tank storage capacity. High aquastat differential. Adjust aquastat to higher setting. See Section VII. Rewire for priority. Boiler cycles more than 5 times per day in summer. Faulty tank aquastat. Excessive demand. Low aquastat differential. Boiler high limit set too low. Faulty aquastat.
SECTION X PARTS LIST PART NAME & DESCRIPTION 1. Aquastat Control 7. Drain Valve 2. Aquastat Well 8. Jacket Head Pan 3. Anode 9. Hole Closure 4. Diptube 10. Heat Exchanger Escutcheon 5. Outlet Nipple 11. Drain Escutcheon 6. T&P Relief Valve 12.
Contact your supplier or plumbing professional for replacement parts or contact the company at the address given on the rating plate of the water heater. Provide the part name, model, and serial numbers of the water heater when ordering parts. READ THE WARRANTY FOR A FULL EXPLANATION OF THE LENGTH OF TIME THAT PARTS AND THE WATER HEATER ARE WARRANTED. Manufactured under one or more of the following U.S. Patents: RE.
800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering) 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Litho in U.S.A.
