Lochinvar Knight 50-210 manual

Service Manual Models: 50 - 210 This manual must only be used by a qualified heating installer / ser vice technician. R ead all instructions, including this manual and the Knight W all Mount Installation and Operation Man ual, before installing. P erform steps in the or der given. F ailure t o comply could r esult in sever e personal injur y , deat[...]

2 Hazar d definitions The following defined terms are used thr oughout this manual to bring attention to the presenc e of hazards of var ious risk le vel s or to important information concerning the life of the product.  DANGER  W ARNING  CAUTION CAUTION NOTICE D ANGER indicates an imminently hazardous situation which, if not avoided, w il[...]

Service Manual Please r ead bef or e pr oceeding Installer – R ead all instructions, including this manual and the Knight W all Mount Installation and Operation Manual, before installing. P erform steps in the order give n. Us e r – This manual is for use only by a qualified heating installer/serv ice technician. Refer to the K night W all Moun[...]

4 Service Manual Please r ead bef or e pr oceeding When servicing boiler – • T o av oid electric shock, disconnect electrical supply before performing maintenance. • T o av oid sever e burns, allow boiler to c ool before performing maintenance. Boiler operation – • Do not block flow of combustion or ventilation air to the boiler . • Sho[...]

Service Manual 5 W ha t is in this manual? Ser vice Near boiler piping • T ypical system components T he Knight wall mount boiler display • Display panel r eadout, buttons and their functions Control module inputs • Control module inputs and options Control module outputs • Control module outputs and options General • Ho w the boiler oper[...]

1 Ser vice 6 Service Manual Near boiler piping This piping referenc e is included to specify the N ear B oiler Piping specific to the Knight wall mount boiler . This piping scheme is important for proper operation of the SMART SY STEM contr o l. See the Knight W all Mount I nstallation and Operation Manual for mor e detailed piping diagrams.[...]

1 Ser vice Service Manual 7 1 Ser vice (continued) T he Knight wall mount display[...]

1 Ser vice 8 Service Manual 1 Ser vice GAS PRESSURE S W ITCH DHW THERMOSTAT ROOM THER MOSTAT / ZONE CONTROL FLOW SW ITCH SYSTEM SENSOR OUTDOOR SENS OR SEQUENCE R / BUILDING MANAGM ENT SYSTEM LOW VOLTAGE CONNECT ION BOARD INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HIGH LIMIT SENSOR FLUE GAS SENSOR FLAME SENSOR LOW W ATER CUTOFF BLOCKED DRAI N SW [...]

1 Ser vice Service Manual 9 1 Ser vice (continued) Control outputs[...]

1 Ser vice 10 Service Manual 1 Ser vice General Oper ation How the boiler operates The Knight wall mount boiler uses an advanced stainless st eel heat ex changer and an electronic co ntrol module that allows fully condensing operation. The blow er pulls in gas and air and pushes flue products out of the boiler through the heat ex changer and flue p[...]

1 Ser vice Service Manual 11 1 Ser vice (continued) Sequence of oper ation T able 1A Sequence of operation - space heating and DHW OPERATION DISPLAY 1. Upon a call for heat, the control turns on the appropriate pumps (system and boiler pumps for sp ace heating call; DHW pump for DHW call). BLR: Standby OUT: 123.8F(129) 2. The control connects 120 v[...]

1 Ser vice 12 Service Manual 1 Ser vice Sequence of oper ation (continued) T able 1A (continued from previous page) Sequence of operation - sp ace heating and DHW OPERATION DISPLAY 8. If the DHW thermostat remains on for more than 30 minutes, and the space heating call for heat is also on, then the control will turn on the boiler pump, turn off the[...]

1 Ser vice Service Manual 13 1 Ser vice (continued) Display panel menu access T able 1B Use this procedure to access menus from the display panel[...]

1 Ser vice 14 Service Manual 1 Ser vice Display panel parameter access T able 1C This is a typical example of accessing a parameter , shown for p arameter I2, boiler pump delay[...]

1 Ser vice Service Manual 15 1 Ser vice (continued) Parameter table T able 1D This table list s SMAR T SYSTEM control module parameters and where to access them MENU SUB ITEM DESCRIPTION SEE PAGE USER ACCESS INSTALLER ACCESS DISPLAY MODIFY DISPLAY MODIFY A 1 Boiler Model 17 Ye s No Ye s No 2 User Code 17 Ye s Ye s Ye s Ye s 3 Date and T ime 17 Ye s[...]

1 Ser vice 16 Service Manual 1 Ser vice Parameter table (continued) T able 1D (continued from previous page) This t able lists SMAR T SYSTEM control module parameters and where to access them The parameters for Building Management S ystem operation are not list ed in this table. They are only accessible using the PC int erface software. See separ a[...]

1 Ser vice Service Manual 17 Viewable and changeable contr ol par ameter s A: General Boiler model The control will displa y “Knight Boiler” as the model number because the same contr ol is used on several models. This will be display ed when parameter A1 has been accessed. This parameter is not changeable. User code The U ser Code allo ws the [...]

1 Ser vice 18 Service Manual 1 Ser vice SH Differential The SH differential sets ho w many degrees belo w the turn off temperature the te mperature has to go before the boiler will turn on. This parameter can only be c hanged by the installer by acc essing parameter B5 . The temperatur e range of this parameter is 0°F to 86°F . The default value [...]

1 Ser vice Service Manual 19 1 Ser vice (continued) Figure 1-1 Outdoor Air Reset Curve Maximum SH set point W hen the outdoor temperatur e drops to or belo w its minimum setting (F1) the water t emperature will be at this point, if the SH set point is set higher (FIG. 1-1). This parameter can be changed by the installer b y acc essing parameter F3 [...]

1 Ser vice 20 Service Manual 1 Ser vice Boost temperature If a SH demand lasts longer than the programmed time delay setting (F9) and there ha ve been no DHW demands, the control will increase the wat er temperature set point b y the amount in this parameter . I f the SH demand continues through another time period, the set point will be increased [...]

1 Ser vice Service Manual 21 1 Ser vice (continued) H: Control modes SH controlling sensor The SH controlling sensor paramet er selects the sensor the control will use to r egulate the boiler firing rate. This parameter is adjustable by the installer by ac cessing parameter H1 . The sensor selections ar e as follows: The outlet sensor regulates the[...]

1 Ser vice 22 Service Manual 1 Ser vice Cascade offset This parameter determines how m uch the temperature m ust go abov e set point before the lead boiler will turn off. This parameter can be adjusted b y the installer by acc essing parameter H5 . The default value is 9.9°F . Cascade off-on differential This parameter determines how m uch the tem[...]

2 Maintenance Service Manual 23 Maintenance and annual star tup T able 2A Service and Maintenance Schedules Ser vice tec hnician (see the following p ages for instructions) General: • Address reported problems • Inspect interior; clean and vacuum if necessary; • Clean condensate trap and fill with fresh water • Check for leaks (water , gas,[...]

2 Maintenance 24 Service Manual Follo w the Serv ice and maintenance pr ocedur es given thr oughout this manual and in component lit erature shipped with the boiler . Failur e to perform the serv ic e and maintenanc e could result in damage t o the boiler or system. Failur e to follo w the directions in this manual and component lit erature could r[...]

2 Maintenance (continued) Service Manual 25 Flue vent system and air piping 1. V isually inspect the entire flue gas ve nting system and air piping for blockage, deterioration or leakage. R epair any joints that show signs of leakage. V er ify that air inlet pipe is connected and pr operly sealed. 2. V erify that boiler vent discharge and air intak[...]

2 Maintenance 26 Service Manual Inspect ignition and flame sense electrodes 1. R emov e the ignition and flame sense electrodes from the boiler heat ex changer acc ess cov er . 2. R emov e an y deposits accumulated on the ignition/flame sense electrode using sandpaper . I f the elec trodes cannot be cleaned satisfactorily , replace with new ones. 3[...]

2 Maintenance (continued) Service Manual 27 Check flame signal 1. At high fire the flame signal shown on the display should be at least 10 microamps. 2. A lower flame signal may indicate a fouled or damaged flame sense electrode. If cleaning the flame sense electrode does not impro ve, g round wiring is in good condition, and g round co ntinuity is[...]

3 T roubleshooting 28 Service Manual Label all wires prior to disconnection when serv icing controls. W iring errors can cause improper and danger ous operation. Always disconnect po wer to the boiler before serv icing. Failur e to comply c ould result in sever e personal injur y , death, or substantial propert y damage. Nev er jumper (bypass) any [...]

3 T roubleshooting (continued) Service Manual 29 T able 3A T roubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION No Display - No 120 vac supplied to unit. • Check external line switch, fuse, or breaker . • Check position of ON/OFF switch. T urn switch to the ON position. • Check 120 vac through the ON/OFF switch. • Check wiring [...]

3 T roubleshooting 30 Service Manual T able 3B - Inlet/Outlet System Sensor Resistance vs. T emperature T emperature Resist ance T emperature Resistance 50 18,780 158 1,990 68 12,263 176 1,458 86 8,194 194 1,084 104 5,592 212 817 122 3,893 140 2,760 T able 3C - Flue T emperature Sensor Resistance vs. T emperature T emperature Resist ance T emperatu[...]

3 T roubleshooting (continued) Service Manual 31 T able 3E T roubleshooting Chart - Noisy System FAULT CAUSE CORRECTIVE ACTION Noisy Operation - Supply gas problem. Natural gas pressures should be between 4 inches w .c. and 14 inches w .c. LP gas pressures should be between 8 inches w .c. and 14 inches w .c. • Refer to Section 7 - Gas Connections[...]

3 T roubleshooting 32 Service Manual T able 3F T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION Flo w Switch/L WCO (will require a manual reset once c ondition has be e n c or r e ct ed. P r e s s the RESET button on the SMAR T SYSTEM display to reset.) Either the optional flow switch or the [...]

3 T roubleshooting (continued) Service Manual 33 T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION Anti-cy c ling The main control board has received a call for heat too quickly after the previous call for heat has ended. • The control board will rele[...]

3 T roubleshooting 34 Service Manual T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION No Flam e Running (will require a manual reset once the c ondition has been correct ed. Press the RESET butt on on the SMAR T SYSTEM display to reset.) The unit was r[...]

3 T roubleshooting (continued) Service Manual 35 T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION Auto R eset High Limit The outlet water temperature has exceeded the fixed setting of the automatic reset high limit or the setting of an optional manual [...]

3 T roubleshooting 36 Service Manual T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION F an High OR F an Speed High (will require a manual reset once the c ondition has been correct ed. P ress the RESET button on the SMAR T SYSTEM display to reset.) The[...]

3 T roubleshooting (continued) Service Manual 37 T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION T emp O/Shoot The stack temperature has exceeded the set parameters for the boiler . • Inspect the heat exchanger . Reference page 27 of this manual for[...]

3 T roubleshooting 38 Service Manual T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION T emp O/Shoot (continued) (will require a manual reset once the c ondition has been correct ed. P ress the RESET button on the SMAR T SYSTEM display to reset.) Outlet[...]

3 T roubleshooting (continued) Service Manual 39 T able 3F (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION Ser vice Blk While the unit is in Service Mode, the outlet temperature has exceeded 185°F . • Establish a heating load to remove the heat from the boil[...]

3 T roubleshooting 40 Service Manual Combustion Analysis Pr ocedur e 1. T urn the main po wer off to the boiler by placing the “On/Off ” switch in the OFF position. 2. Remov e the flue temperatur e sensor from the flue pipe connection. No t e : Combustion measurements will be made at this point. 3. T urn the main po wer on to the boiler b y pla[...]

3 T roubleshooting (continued) Service Manual 41 Gas valv e adjustment procedur e If adjust ment of the gas valve is deemed nec essary , use the following procedur es: Locate the throttle adjustment scr ew on the side of the venturi valv e (FIG. 3-2). U sing a screw driver , turn the screw a 1/4 turn clockwise to increase CO 2 levels or a 1/4 turn [...]

4 Notes 42 Service Manual[...]

4 Notes Service Manual 43[...]

Revision Notes: Revision B (ECO #C02407) reflects air pressure switch changes, removal of references to the pocket pc, and changes made to the Circulation Pumps Section (page 22). Revision C (ECO #C02545) reflects the addition of references to periodic cleaning of screens in vent terminations and safety shutoff testing and instructions. WB-SER-Rev [...]