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  5. Installation And Operating Manual

Laars INDIRECT-FIRED Installation And Operating Manual

Summary of INDIRECT-FIRED

  • Page 1

    238-43480-00e rev 01/08 doc. 11045 i ndirect - 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 p...

  • Page 2: Congratulations!

    2 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 profession...

  • Page 3: I- Important

    3 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 require...

  • Page 4: Section I

    4 section i important information -read carefully- the 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 consulte...

  • Page 5: Appliance.

    5 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 i...

  • Page 6: Unless They Are Cool.

    6 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 u...

  • Page 7: Controls Or Safety Devices.

    7 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 t...

  • Page 8: Section II

    8 section ii specifications figure 1 – tank layout table 1: water heater dimension (inches) model a b c d e f 30-gal. / res. 22 33-5/8 28-1/4 34-3/8 5-3/8 27-1/2 40-gal. / res. 24 36 29-3/4 36-3/4 5-3/8 27-1/2 40-gal. “r” / res. 22 41-1/8 34-3/8 41-7/8 5-3/8 27-1/2 50-gal. / res. 26 36 29-3/4 36-3/4...

  • Page 9: Model

    9 specifications continued- table 2: water heater capacities model tank capacity (gal) coil volume (gal) dry weight (lbs) wet weight (lbs) 30-gal. / res. 30 2.7 140 404 40-gal. / res. 40 2.7 172 500 40-gal. “r” / res. 38 2.7 172 486 50-gal. / res. 50 2.7 196 610 50-gal. “r” / res. 48 2.7 180 576 65-...

  • Page 10: Model

    10 specifications continued- table 4: water heater performance model maximum first hour rating (gal/hr) @ 140 °f 115 °f continuous draw rating (gal/min) @ 140 °f 115 °f approximate boiler output needed for ratings (btu/hr) 30-gal. / res. 279 429 4.2 6.7 220,000 40-gal. / res. 288 438 4.2 6.7 220,000...

  • Page 11

    11 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...

  • Page 12: Section III

    12 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 pr...

  • Page 13

    13 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. For protection against excessi...

  • Page 14

    14 general information continued- sacrificial anodes—three sacrificial anode rods have been installed in the tank head to extend tank life. The anode rods should be inspected annually to determine the amount of sacrificial decay and replaced when necessary to prolong tank life. Water conditions in y...

  • Page 15: Section IV

    15 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. Allequipment is carefully manufactured, inspected, and packed. Our responsibility ceases upon delivery of the packaged hea...

  • Page 16: System Zone Control

    16 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 pressu...

  • Page 17: Domestic Hot Water Priority

    17 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. Priority ...

  • Page 18: Component Location

    18 pre-installation continued- component location clearance from combustible materials top sides front rear 0” 0” 0” 0” table 6 – combustible material clearances recommended service clearances non-piping side front (aquastat) rear t & p relief valve side 4” 16” 0” 4” table 7 – service clearances cau...

  • Page 19

    19 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...

  • Page 20: Section V

    20 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 ...

  • Page 21

    21 water connections continued- install temperature and pressure relief valve (if not factory installed) instructions for potable connections 1. Before proceeding with the installation, close the main water supply valve. After shutting off the main water supply, open a faucet to relieve the water li...

  • Page 22: Water.

    22 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 possib...

  • Page 23

    23 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...

  • Page 24: Connect

    24 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 re...

  • Page 25: Section VI

    25 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. This indirect-fired water heater is supplied with an aquastat temperature control. T...

  • Page 26: Section Vii

    26 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 (e...

  • Page 27: System Start-Up

    27 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 s...

  • Page 28: Approximate

    28 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. For the most energy efficient operation, adjust the aquastat for t...

  • Page 29: Section Viii

    29 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...

  • Page 30: Checking Operation.

    30 maintenance continued- if the temperature–pressure relief valve on the heater discharges periodically or continuously, it may be due to thermal expansion of water in a closed water supply system, or it may be due to a faulty relief valve. Thermal expansion is the normal response of water when it ...

  • Page 31

    31 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 a...

  • Page 32: Section Ix

    32 section ix trouble shooting guide problem cause solution refer to boiler installation instructions. Check main service switch. Boiler does not operate. Check fused disconnect. Check power supply. Circulator does not operate. Replace as necessary. Improper aquastat setting or calibration. Turn tan...

  • Page 33: Problem Cause

    33 trouble shooting guide continued- problem cause solution aquastat setting too low. Adjust aquastat to higher setting. See section vii. Undersized boiler with no priority to domestic hot water. Rewire for priority. Peak use of hot water is greater than tank storage capacity. Determine peak usage a...

  • Page 34: Section X

    34 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. Control escutcheon.

  • Page 35

    35 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 lengt...

  • Page 36

    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. © laars heat...