Gas fired commercial copper boilers instruction manual printed 0213 321078-002 thank you for buying this energy efficient boiler. We appreciate your confidence in our products. Models: hw 300, 399, 420, 520, 670 for hydronic heating and hot water supply up - flow models installation - operation main...
2 system connections ........................................................................ 16 air requirements ............................................................................. 16 unconfined space ........................................................................... 16 fresh air...
3 the proper installation, use and servicing of this boiler is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your boiler to warn you and others of a potential injury hazard. Read and obey all safety...
4 grounding instructions this boiler must be grounded in accordance with the national electrical code, canadian electrical code and/or local codes. Boiler is polarity sensitive; correct wiring is imperative for proper operation. This boiler must be connected to a grounded metal, permanent wiring sys...
5 this design complies with the current edition of the ansi z21.13 low-pressure boiler standard. Compliance under this standard implies that when the boiler underwent test, the gas manifold and control assembly pro vided on the boiler met safe lighting and other performance criteria. Detailed instal...
6 dimensions and capacity data extra opening for thermometer a n d p r e s s u r e relief valve hw-520 and hw--670 dimensions in inches models hw-300 hw-399 hw-420 hw-520 hw-670 a overall height 65 (1651) 57-1/8 (1451) 57-1/8 (1451) 68-5/16 (1735) 67-1/2 (1715) b height to top of jacket 43-1/4 (1099...
7 table 3. Recovery capacities models type of gas input °f 20 40 50 60 70 80 btu/hr kw °c (11) (22) (28) (33) (39) (44) hw 300 natural 300,000 88 gph 1,455 727 582 485 416 364 propane lph 5,506 2,753 2,202 1,835 1,573 1,377 hw 399 natural 399,000 117 gph 1,935 967 774 645 553 484 propane lph 7,323 3...
8 figure 2. Component locations control components.
9 thermal balancer figure 5 shows the internal wiring of the thermal balancer. The device may be tested after disconnecting the four leads from their respective terminals on the unit. 1. Apply a test light to the yellow and red leads. • the lamp should light as the contact in this circuit is normall...
10 pressure relief valve an asme rated pressure relief valve is furnished with the boiler. A fitting for the pressure relief valve is provided in the top of the boiler. Never operate the heating elements without being certain the boiler is filled with water and a properly sized pressure relief valve...
11 use anti-scald valve(s) in the hot water system to reduce the risks of scalds at points of use such as lavatories, sinks and bathing facilities. A change in water temperature in the storage tank lower than the tank temperature control setting will cause the sensor to close its contacts and conseq...
12 boiler installation considerations hydronic system all modern hydronic type boilers are exceptionally fast heating units. The low water volumes in relation to firing rates require special attention to water flow rates for smooth, efficient operation. These considerations for the a. O. Smith coppe...
13 cooling piping when the boiler is used in conjunction with a refrigeration system it must be installed so that the chilled medium is piped in parallel with the boiler with appropriate valves to prevent the chilled medium from entering the boiler, see figure 7. Water temperature in the heating sys...
14 flow switch the flow switch is a safety device which must be installed at the water outlet of the unit to prevent main burner operation in the event of inadequate water flow through the unit. An accessory package containing a flow switch is available for this application. This switch may be mount...
15 general requirements required ability installation or service of this boiler requires ability equivalent to that of a qualified service technician in the field involved. Plumbing, air supply, venting, gas supply, and electrical work are re quired. Location when installing the boiler, consideratio...
16 air requirements for safe operation an adequate supply of fresh uncontaminated air for combustion and ventilation must be provided. An insufficient supply of air can cause recirculation of combustion products resulting in contamination that may be hazardous to life. Such a condition often will re...
17 confined space a confined space is one whose volume is less than 50 cubic feet per 1,000 btu/hr (4.8 cubic meters per kw) of the total input rating of all appliances installed in the space. Openings must be installed to provide fresh air for combustion, ventilation and dilution in confined spaces...
18 the confined space shall be provided with two permanent vertical ducts, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The vertical ducts shall communicate directly with the outdoors. See figure 13. Each duct openin...
19 fittings and unions in gas line must be of metal to metal type. Apply joint compounds (pipe dope) sparingly and only to the male threads of pipe joints. Do not apply compound to the first two threads. Use compounds resistant to the action of liquefied petroleum gases. The boiler and its gas conne...
20 table 12. S uggested p ipe s ize f or m ul tiple g as a ppliances (n atural g as ) nominal maximum capacity of pipe in btu/hr and kw for gas pressures of 14 in. W .C. (0.5 psi) or less and iron pipe a pressure drop of 0.5 in. W .C. (based on 0.60 specific gravity gas w/heating v alue of 1,000 btu...
21 venting standard venting type b venting may be used with these boilers. All local utility regulations on venting should be followed. Vent sizing, installation and termination shall be in accordance with the current edition of the national fuel gas code, ansi z223.1, or can/csa b149.1, installatio...
22 sidewall venting the optional sidewall power vent system is certified for maximum 100' equivalent venting. The power vent kits p/n for hw300, 399- 420, 520, 670 are 325614-000, 325614-001, 325614-002 and 325614-003 respectively. If you are installing the optional power vent kit, refer to your hw ...
23 model hw-300 boiler input: 300,000 btuh draft hood outlet 8" required connector or smoke pipe diameter connector rise in feet total vent height (measured in feet above draft hood) 10 15 20 30 40 50 60 80 100 connector diameter (in inches) 1 10 10 10 10 10 10 10 10 10 2 10 10 10 10 10 10 10 10 10 ...
24 4. When installing multiple boilers in the same gas supply system it is recommended that individual positive lock-up gas pressure regulators be installed at each unit. Pipe sizes for propane gas make sure to contact the gas supplier for pipe sizes, tanks, and 100% lockup gas pressure regulator. P...
25 adjustment, if required, is performed as follows: 1. Set primary system temperature control dial (thermostat) at lowest setting so that boiler will not call for heat. 2. Attach a pressure gauge to the tapping in the control string elbow. 3. Reset primary system temperature control dial (thermosta...
26 boiler start up and operations after placing the boiler into operation, the ignition system safety shutoff device must be tested by the following test method . 1. Reset high limit temperature control to lowest setting. (see figure 3 on page 9). 2. Reset system controller to maximum setting, causi...
27 figure 20. Spark ignition pilot burner and burner flame figure 21. Adjusting pilot flame 2. Pilot burner - electronic ignition to establish pilot flame without main burner operation, it will be necessary to perform the following steps: servicing of the pilot burner (every six months) includes kee...
28 6. Remove the pressure gauge or manometer from the manifold pressure tapping. Replace the screw-in plug in the manifold pressure tap. 7. Repeat steps 7 thru 11 of the operating instructions on page 31. The boiler will resume normal operation. When the boiler is operating at full capacity, or full...
29 start stage 1 trial for ignition stage 2 main burner operation end thermostat (controller) calls for heat spark generator powered first valve (pilot) operator opens pilot burner operation pilot burner lights. Pilot burner does not light module senses module response flame current. S-8600m after 1...
30 lighting and operating instructions (natural and propane for hw300 - hw399).
31 lighting and operating instructions (natural and propane with i.I.D. For hw420 & up).
32 table 17. Cer-temp 80 recovery system checkout procedure before any extensive troubleshooting, perform the following: ensure that: • voltage (120 vac) is supplied to the boiler. • system control (tank temperature control, thermostat, etc.) is calling for boiler operation (call for heat). • other ...
33 checking honeywell s-8600h or s-8600m intermittent ignition controls turn off gas supply. Is voltage (24 vac) across the 24 v terminals on module during “call for heat”? Turn off power supply. Is ignition cable firmly plugged into pilot assembly and module? Is ground wire firmly attached to pilot...
34 checking honeywell s-8600h or s-8600m intermittent ignition controls spark at pilot burner but pilot will not light ensure all manual shutoff valves are fully open; all filters are clean; all gas connections are gas tight; pilot tubing is not damaged, obstructed or kinked; and pilot orifice is un...
35 checking honeywell s-8600h or s-8600m intermittent ignition controls pilot burner lights but main burner does not light does the pilot flame cover 3/8” to 1/2” of igniter/sensor rod? Does spark stay on for more than 15 seconds after the pilot is “proven” (lit)? Ensure the ground wire and ignition...
36 checking honeywell s8600h or s-8600m intermittent ignition controls no spark at pilot burner but pilot will not light turn off gas supply. Is there a good connection between terminals? Is module securely attached to boiler for good ground connection? Is voltage (24vac) across transformer positive...
37 figure 22. Location of led's yellow led flash code a indicates recommended service action heartbeat normal flame signal not applicable 2 weak flame signal- system will operate reliably but flame signal is less than desired. Note: this indication may flash temporarily during or shortly after light...
38 green led flash code (x+y) a indicates next system action recommended service action off no "call for heat" not applicable none flash fast startup - flame sense calibration not applicable none heartbeat normal operation not applicable none 2 5 minute retry delay • pilot flame not detected during ...
39 green led flash code (x+y) a indicates next system action recommended service action off no "call for heat" not applicable none flash fast startup - flame sense calibration not applicable none heartbeat normal operation not applicable none 3 recycle • flame failed during run initiate new trial fo...
40 general maintenance these boilers are designed to give many years of efficient and satisfactory service when properly operated and maintained. To assure continued good performance, the following recommendations are made. The area around the boiler should be kept clean and free from lint and debri...
41 venting maintenance it is recommended that the heating surfaces and vent piping of the boiler be checked every six months for dust, deterioration and carbon deposits. Remove all soot or other obstructions from chimney and flue which will retard free draft. Replace any damaged or deteriorated part...
42 the electrical connections must be made so that the circulating pump will operate before the gas control valve opens. At no time may the controlling system allow the burner to fire when there is no water flow through the boilers. Refer to the diagram in figure 24 on pages 43 for proper wiring seq...
43 120 vac 60 hz l1 (hot) l2 (neutral) ) l a r t u e n ( 2 l ) t o h ( 1 l 120 vac 60 hz 120v 24v high limit ignition module chassis ground igniter wire to pilot note: if replacing any factory wiring, use type 105°c wire or equivalent, except for the ignition wire which uses 250°c wire and the coil ...
44 figure 25. Cer - temp 80 - 1 unit installation - for hot water supply application figure 26. Schematic: cer - temp 80 - 1 unit installation - for hot water supply application.
45 figure 27. Cer - temp 80 - 2 or 3 unit installation connection diagram - for hot water supply application.
46 figure 28. Cer - temp 80 - 2 or 3 unit installation schematic diagram - for hot water supply application.
47 n otes : 1. P re ferred piping diagram . 2. The tempera ture and pre ssure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. S ervi ce val ves are shown for servicing uni t. Howeve r, local codes s hall govern their usage . 4. A. O. S mi th piping me...
48 n ot es : 1. Pr ef err ed piping diag ra m . 2. The te m pe ra tu re and p re ss ur e relie f v al ve s ett ing s hall no t e xc eed p re ss ur e ra ting o f an y co m ponen t in the syst em . 3. Se rv ic e val ve s ar e shown fo r s erv ic ing uni t. Howe ve r, lo cal c ode s shall go ve rn thei...
49 n otes : 1. Pre ferred piping diagram . 2. The tempera ture and pressure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Service valves are shown for s ervicing uni t. Howeve r, local codes shall govern their usage . 4. A. O. S mi th piping me thod...
50 n otes : 1. Pre ferred piping diagram . 2. The tempera ture and pressure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Service valves are shown for s ervicing uni t. Howeve r, local codes shall govern their usage . 4. A. O. S mi th piping me thod...
51 n otes : 1. Pre ferred piping diagram . 2. The tempera ture and pressure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Service valves are shown for s ervicing uni t. Howeve r, local codes shall govern their usage . 4. A. O. S mi th piping me thod...
52 n otes : 1. Pre ferred piping diagram . 2. The tempera ture and pressure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Service valves are shown for s ervicing uni t. Howeve r, local codes shall govern their usage . 4. A. O. S mi th piping me thod...
53 n otes : 1. P re ferred piping layou t. 2. The tempera ture and pres sure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. S er vi ce v alve s are s hown for s ervicing boile r. Howeve r, local codes shall govern their usage . Hw b urk a y boiler (3...
54 figure 36. Two boilers primar y/ secondar y hydronic piping system n otes : 1. Pre ferred piping layou t. 2. The tempera ture and pres sure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Ser vi ce v alve s are s hown for s ervicing boile r. Howeve...
55 figure 37. Three boilers primar y/ secondar y hydronic piping system n otes : 1. Pre ferred piping la you t. 2. The tempera ture and pre ssure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Servi ce v al ves are s hown for servicing boile r. Howev...
56 figure 38. Four boilers primar y/ secondar y hydronic piping system n otes : 1. Pre ferred piping la you t. 2. The tempera ture and pre ss ure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Ser vice valve s are shown for s ervicing boile r. Howeve...
57 figure 39. Zone pumping/ horizont al buffer t ank hea ting system ex pansion t ank make-u p w ater zone pumps zone loo p supplies zone returns air se par at or thermal accumul at or (buffer t ank) finished floor aos st orage t ank n otes : 1. Pre ferred piping layou t. 2. The tempera ture and pre...
58 figure 40. Zone pumping/ vertical buffer t ank hea ting system n otes : 1. Pre ferred piping la you t. 2. The tempera ture and pre ss ure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Ser vice valve s are shown for s ervicing boile r. Howeve r, l...
59 figure 41. Boiler/ vertical buffer t ank hea ting system n otes : 1. Pre ferred piping layou t. 2. The tempera ture and pres sure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Servi ce v alve s are s hown for s ervicing boile r. Howeve r, lo cal ...
60 figure 42. Boiler/ vertical buffer t ank, 3 w ay mi xing v al ve hea ting system n otes : 1. Pre ferred piping la you t. 2. The tempera ture and pre ssure relie f valve se tting shall no t exceed pressure ra ting o f any componen t in the sys tem . 3. Servi ce val ves are shown for servicing boil...
61 limited warranty a. O. Smith corporation, the warrantor, extends the following limited warranty to the owner of this boiler: 1. If within ten years after initial installation of the boiler, a heat exchanger or gas burner should prove upon examination by the warrantor to be defective in material o...
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