Manuals+

Reznor Replacement Parts for Downflow Unit Heaters - Model LDAP

Revision: LDAP-RPL (04-22) Supersedes: LDAP-RPL (01-22)

Table of Contents

  • References
  • Warranty
  • Cabinet Configurations
  • Serial Number
  • Electrical Components
  • Venter Components
  • Fan Components
  • Heat Exchanger Components
  • Burner Assembly Components
  • Cabinet Components
  • Accessories/Options

Important Notes

  1. Always include complete model and serial number for parts replacement to save time and expense.
  2. Reznor reserves the right to alter information and specifications without notice due to continuous product improvement.
  3. Functional replacements may be substituted.
  4. Order by Part Number (PN), not by option designation.

References

The following technical manuals are available from the Factory Distributor:

TypeFormPN*
Installation/operation/maintenanceLDAP-IOM207733
Gas conversion kit installationLDAP-GC208881
Heat exchanger gasket kit installationLDAP-HX209212
High-elevation pressure switch replacement instructionsLDAP-DJ20208081
Vertical louver kit installationLDAP-CD32208898
Downturn nozzle kit installationLDAP-CD57,58,59208899
Relay kits for multiple heater controlLDAP-CL31,321041278

*Also available at www.reznorhvac.com.

Warranty

The heater is supplied with a 1-year limited warranty. Contact your Distributor for details.

Cabinet Configurations

These indirect-fired, indoor, downflow packaged heaters are available in three configurations, as shown in Figure 1.

Figure 1. Cabinet Configurations

Figure 1 illustrates the three cabinet configurations for Reznor LDAP downflow unit heaters.

  • Unit Size 400: Depicts a single downflow heater.
  • Unit Size 800: Shows one heater with two downflow heat sections.
  • Unit Size 1200: Displays one heater with three downflow heat sections.

Serial Number

The serial number is located on the unit's rating plate. Serial numbers are decoded as follows:

Models before JUN 2015:

Serial number sample: BDF 79 X7 N 00000

Elements key number: 1 | 2 | 3 | 4 | 5

Key:
1 = Date code (refer to Table 2)
2 = Ignition system type
3 = Gas valve type
4 = Gas type (N = natural, L = propane)
5 = Consecutive number

Models after MAY 2015:

Serial number sample: BOG 3062 00000

Elements key number: 1 | 2 | 3

Key:
1 = Date code (refer to Table 2)
2 = Plant of manufacture (3060 = Mercer, 3062 = Monterrey)
3 = Consecutive number

Table 2. Serial Number Date Codes (Month and Year)
YearJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
2004BDABDBBDCBDDBDEBDFBDGBDHBDIBDJBDKBDL
2005BEABEBBECBEDBEEBEFBEGBEHBEIBEJBEKBEL
2006BFABFBBFCBFDBFEBFFBFGBFHBFIBFJBFKBFL
2007BGABGBBGCBGDBGEBGFBGGBGHBGIBGJBGKBGL
2008BHABHBBHCBHDBHEBHFBHGBHHBHIBHJBHKBHL
2009BIABIBBICBIDBIEBIFBIGBIHBIIBIJBIKBIL
2010BJABJBBJCBJDBJEBJFBJGBJHBJIBJJBJKBJL
2011BKABKBBKCBKDBKEBKFBKGBKHBKIBKJBKKBKL
2012BLABLBBLCBLDBLEBLFBLGBLHBLIBLJBLKBLL
2013BMABMBBMCBMDBMEBMFBMGBMHBMIBMJBMKBML
2014BNABNBBNCBNDBNEBNFBNGBNHBNIBNJBNKBNL
2015BOABOBBOCBODBOEBOFBOGBOHBOIBOJBOKBOL
2016BPABPBBPCBPDBPEBPFBPGBPHBPIBPJBPKBPL
2017BQABQBBQCBQDBQEBQFBQGBQHBQIBQJBQKBQL
2018BRABRBBRCBRDBREBRFBRGBRHBRIBRJBRKBRL
2019BSABSBBSCBSDBSEBSFBSGBSHBSIBSJBSKBSL
2020BTABTBBTCBTDBTEBTFBTGBTHBTIBTJBTKBTL
2021BUABUBBUCBUDBUEBUFBUGBUHBUIBUJBUKBUL
2022BVABVBBVCBVDBVEBVFBVGBVHBVIBVJBVKBVL
2023BWABWBBWCBWDBWEBWFBWGBWHBWIBWJBWKBWL
2024BXABXBBXCBXDBXEBXFBXGBXHBXIBXJBXKBXL
2025BYABYBBYCBYDBYEBYFBYGBYHBYIBYJBYKBYL
2026BZABZBBZCBZDBZEBZFBZGBZHBZIBZJBZKBZL
2027CAACABCACCADCAECAFCAGCAHCAICAJCAKCAL
2028CBACBBCBCCBDCBECBFCBGCBHCBICBJCBKCBL
2029CCACCBCCCCCDCCECCFCCGCCHCCICCJCCKCCL
2030CDACDBCDCCDDCDECDFCDGCDHCDICDJCDKCDL
2031CEACEBCECCEDCEECEFCEGCEHCEICEJCEKCEL
2032CFACFBCFCCFDCFECFFCFGCFHCFICFJCFKCFL
2033CGACGBCGCCGDCGECGFCGGCGHCGICGJCGKCGL
2034CHACHBCHCCHDCHECHFCHGCHHCHICHJCHKCHL
2035CIACIBCICCIDCIECIFCIGCIHCIICIJCIKCIL

Electrical Components

Figure 2. Electrical Components (Refer to Table 3)

Figure 2 shows a diagram of the electrical components within the unit. Key numbered components include: 1. Terminal board, 2. Destratification relay, 3. Vent permissive relay, 4. Limit control, 5. Terminal strip, 6. Flame sensor, 7. Heat permissive relay, 8. Ignitor, 9. Fan permissive relay, 10. DSI control board, 11. Gas valve, 12. Transformer, 13. Disconnect switch, 14. High limit control, 15. Control (destratification fan), 16. Capacitor (fan motor), 17. Venter motor capacitor, 18. Fan motor, 19. Venter motor, 20. Pressure switch (heat section), 21. Wiring harness, 23. Wire (ignitor), 24. Venter motor (flue collection), 25. Pressure switch (flue collection box).

Table 3. Electrical Components
Item No.ComponentDescriptionUnit Size
4008001200
PN (Quantity)*
1Terminal board24V, 7-pole164545
2Destratification relay, SPST24V coil, with base (PN 211415), units manufactured after AUG 2011
24V coil, units manufactured before SEP 2011		211411
98118
2ARelay replacement kitDestratification relay, replaces PN 98118263527
3Vent permissive relay, SPST208V (AK2), with base (PN 211415), units manufactured after AUG 2011
230V (AK3), with base (PN 211415), units manufactured after AUG 2011
Units manufactured before SEP 2011		211413
211414
130821
3ARelay replacement kitVent permissive relay, replaces PN 130821263529
4Limit control240°F, silver dot202048
5Terminal strip7-pole164544 (2)164544 (5)164544 (7)
6SensorFlame195292
7Heat permissive relay, SPST24V coil, with base (PN 211415), units manufactured after AUG 2011
24V coil, units manufactured before SEP 2011		211411
98118
7ARelay replacement kitHeat permissive relay, replaces PN 98118263527
8Ignitor175272
9Fan permissive relay, SPDT208V (AK2), with base (PN 211415), units manufactured after AUG 2011
230V (AK3), with base (PN 211415), units manufactured after AUG 2011
Units manufactured before SEP 2011		211413
211414
157808
9ARelay replacement kitFan permissive relay, replaces PN 157808263529
10DSI control boardCircuit board195265
10AFuse**DSI control board201685
11Gas valveSingle-stage, natural gas, serial No. code Y3 or Z8
Two-stage, natural gas, serial No. code Y9 or 5A
Single-stage, propane, serial No. code Y5 or 1A
Two-stage, propane, serial No. code Y7 or 3A		196981
197067
196983
197065
12Transformer208/240V, 40VA194536
13Disconnect switch40A207948207948 (1)
14High limit controlManual reset, 150°, white dot112753
15ControlDestratification fan, adjustable207929207929 (1)
16CapacitorFan motor, 20µF @ 370VAC207582
16ABootCapacitor (Syntex #M-78)103182
17CapacitorVenter motor195641
18Fan motor208/230V, 1-HP, 3-speed (A.O. Smith #F48U34A13)207734
19Venter motor208/240V, heat section196830
20Pressure switchHeat section, yellow label, <6000-foot elevation
Heat section, light blue label, ≥6000-foot elevation		197028
197029
21Wiring harness5-circuit208043
22(not shown)9-circuit208224
23Wire (not shown)Ignitor208231
24Venter motorFlue collection (AOS #C199)-16074
25Pressure switchFlue collection box-205445

*Quantity is one (1) for unit size 400, two (2) for unit size 800, or three (3) for unit size 1200 unless otherwise indicated.
**May also use field-supplied fuse, type ATC or ATO 3, color violet.

Figure 3. Individual Electrical Components (Refer to Table 3)

Figure 3 provides visual representations of individual electrical components. It shows:

  • Item 1: Terminal Board
  • Item 5: Terminal Strip
  • Item 11: Gas Valve (Single-Stage and Two-Stage)
  • Items 2, 3, 7, and 9: Relay and Base
  • Item 6: Flame Sensor
  • Item 4: Limit Control
  • Item 8: Ignitor
  • Item 11: DSI Control Board
  • Item 15: Fan Control
  • Item 12: Transformer
  • Item 13: Disconnect Switch
  • Item 14: High Limit Control
  • Item 17: Venter Motor Capacitor
  • Item 24: Venter Motor
  • Item 16: Fan Motor Capacitor
  • Item 20: Pressure Switch, Heat Section
  • Item 25: Pressure Switch, Flue Collection Box
  • Item 16A: Capacitor Boot

Venter Components

NOTES:

  • For the flue collection box section venter motor and wheel assembly:
  • Do not use the key provided with the motor.
  • Locate the setscrew on the wheel approximately 180° from the keyway in the motor. Torque the setscrew to 125 (±5) inch-pounds.
Figure 4. Venter Components (Refer to Table 4)

Figure 4 illustrates Venter Components. It includes diagrams for:

  • Heat Section Venter Motor and Wheel Assembly: Shows the motor, wheel, and associated parts (11. Wheel, 7. Plate, 10. Venter motor plate screw, 10A. Hex nut, 5. Isolator, 6. Isolator bushing, 9. Clip, 9A. Venter motor clip screw, 12. Fan). An assembled view is also provided, indicating a 7/16 inch (11 mm) shaft.
  • Flue Collection Box Section Venter Motor and Wheel Assembly: Shows the assembly with components labeled (13. Housing, 14. Motor and wheel assembly, 14B. Base assembly, 14C. Capscrew, 14D. Washer, 14E. Hex nut, 14F. Wheel). An assembled view is provided, indicating a 1-1/4 inch (32 mm) dimension.
Table 4. Venter Components
Item No.ComponentDescriptionUnit Size
4008001200
PN (Quantity)*
Heat Section
1Housing (not shown)Venter209205
1AGasket (not shown)Venter housing196013
2Pressure tap (not shown)Static116043 (2)116043 (4)116043 (6)
3Venter motor208/240V (see Figure 2)236163
4Mounting bracket**Venter195072
5IsolatorVenter194534 (3)194534 (6)194534 (9)
6Isolator bushingVenter194803 (3)194803 (6)194803 (9)
7PlateVenter motor194910
8GasketVenter motor plate201472
9Clip**Venter motor194805 (3)194805 (6)194805 (9)
9AVenter motor clip screw**Slotted, #8-32 x 1/292851 (3)194806 (6)194806 (9)
10Venter motor plate screw#10-24 x 3/4202949 (3)202949 (6)202949 (9)
10AHex nut#10-24111377 (3)111377 (6)111377 (9)
11WheelVenter195666
12FanCooling196035
Flue Collection Box Section
13HousingVenter151343 (1)
13AGasketVenter (not shown)149857 (1)
14Motor and wheel assemblyVenter1024267 (1)
14AMotorVenter (see Figure 2 and Figure 3)16074 (1)
14BBase assemblyVenter motor207837 (1)
14CCapscrewHex head, 1/4-20 x 3/4-16246 (4)
14DWasherPlain, 3/8-inch SAE-6593 (4)
14EHex nut1/4-20, with toothed washer-10650 (4)
14FWheelVenter8735 (1)
15Probe assemblyFlow-sensing151559 (1)
16Tube, silicone rubber13 inches long (not shown)174399 (1)

*Quantity is one (1) for unit size 400, two (2) for unit size 800, or three (3) for unit size 1200 unless otherwise indicated.
**Used on units manufactured before MAR 2015.

Fan Components

Figure 5. Fan Components (Refer to Table 5)

Figure 5 details Fan Components. It shows an exploded view of the fan assembly including the fan motor (1), fan guard (2), screws (2A), isolators (2B), tinnerman nuts (2C), nuts (2D), flat washers (2E), and the fan blade (3). An assembled fan and motor view is also shown, with a note indicating a setscrew torque of 130 (±10) inch-pounds.

Table 5. Fan Components
Item No.ComponentDescriptionUnit Size
4008001200
PN (Quantity)*
1Fan motor208/230V, 1-HP, 3-speed (A.O. Smith #F48U34A13)207734
2GuardFan170086
2AScrewFan guard96452 (4)96452 (8)96452 (12)
2BIsolatorFan guard, with washer96451 (4)96451 (8)96451 (12)
2CTinnerman nutFan guard54633 (4)54633 (8)54633 (12)
2DNutMotor to fan guard216942 (4)216942 (8)216942 (12)
2EFlat washerMotor to fan guard204323 (8)204323 (16)204323 (24)
3BladeFan207729

*Quantity is one (1) for unit size 400, two (2) for unit size 800, or three (3) for unit size 1200 unless otherwise indicated.

Heat Exchanger Components

Figure 6. Replacement Heat Exchanger (Refer to Table 6)

Figure 6 displays the Replacement Heat Exchanger assembly and its components. Key parts include: 1. Heat exchanger assembly, 1A. Gasket kit, 1B. Top, 1C. Header panel gasket (side), 1D. Bottom, 2. Panel (rear), 3. Heat exchanger support (middle), 4. Heat exchanger support (bottom), and 5. Channel (tube support).

Table 6. Heat Exchanger Components
Item No.ComponentDescriptionUnit Size
4008001200
PN (Quantity)*
1Heat exchanger assembly**With gasket kit, aluminized steel
With gasket kit, 409 stainless steel
Heat exchanger assembly (field-installed)		209209
209210
209211
1AGasket kit
1BTop207727
1CHeader panel gasketSide207728 (2)207728 (4)207728 (6)
1DBottom207727
2PanelRear207553207553207553
3Heat exchanger supportMiddle207554207554207554
4Bottom (not shown)207555207555207555
5ChannelTube support207552 (4)207552 (8)207552 (12)

*Quantity is one (1) for unit size 400, two (2) for unit size 800, or three (3) for unit size 1200 unless otherwise indicated.

Burner Assembly Components

Figure 7. Burner Assembly (Refer to Table 7)

Figure 7 illustrates the Burner Assembly and its components. Labeled parts include: 1. Burner assembly (includes venturi tubes), 2. Side, 3. Burner shield (bottom), 4. Burner shield (top), 5. Sight-hole cover (burner shield), and 6. Support (burner).

Table 7. Burner Assembly Components
Item No.ComponentDescriptionUnit Size
4008001200
PN (Quantity)*
1Burner assemblyIncludes venturi tubes195243
2Side195500 (2)
3Burner shieldBottom195521
4Top195511
5Sight-hole coverBurner shield10756
6SupportBurner196598 (6)196598 (12)196598 (18)
7Burner orifice (not shown)9.6 mm, natural gas
5.8 mm, propane		196897
196905
8Orifice adapter (not shown)3/4 x 3/8 bushing194809
8AOrifice adapter nut (not shown)1/2-inch165702

*Quantity is one (1) for unit size 400, two (2) for unit size 800, or three (3) for unit size 1200 unless otherwise indicated.

Cabinet Components

NOTE: Refer to the CABINET CONFIGURATIONS section.

Figure 8. Cabinet Components (Refer to Table 8)

Figure 8 shows Cabinet Components for Unit Size 400 and Unit Size 1200.

  • Unit Size 400: Depicts the unit with numbered components like 10. Outlet collar, 12. Flue wrapper assembly, 12A. Pressure tap, 12B. Side gasket, 12C. Top/bottom gasket.
  • Unit Size 1200: Shows the unit with numbered components including 1. Panel assembly, 4. Side panel (left), 5. Intermediate panel (left), 6. Intermediate panel (right), 7. Splice plate, 8. Fan panel, 11. Splice plate, 13. System flue collection box (bottom and rear), 14. System flue collection box (top and front), 16. Exhauster end, 17. Gasket, 18. Door, 19. Handle, 20. Strut, 21. Louver.
Table 8. Cabinet Components
Item No.ComponentDescriptionUnit Size
4008001200
PN (Quantity)*
1Panel assemblyBottom207677207677207677
2Air baffleSide, interior (not shown)207610 (2)207610 (4)207610 (6)
3Side panelRight207558207558207558
4Left207559207559207559
5Intermediate panelLeft-208026 (1)208026 (2)
6Right-208027 (1)208027 (2)
7Splice plateTop and bottom-207566207566 (4)
8Fan panelTop207564207564 (1)207564 (1)
9PlugHole16452--
10Outlet collar6-inch195662--
11Splice plateAssembly-207731207731 (4)
12Flue wrapper assemblyHeat section207561207561207561
12APressure tapStatic, in flue wrapper116043116043116043
12BSide gasketHeat section flue wrapper170037 (2)170037 (4)170037 (6)
12CTop/bottom gasketHeat section flue wrapper170039 (2)170039 (4)170039 (6)
13System flue collection boxBottom and rear-207568 (1)207569 (1)
14Top and front-207570 (1)207571 (1)
15End--207579 (1)
16Exhauster end--207580 (1)207581 (1)
17GasketFan panel/flue collection box-207732207732
18DoorAccess207572207572207572
19HandleDoor196881196881 (1)196881 (1)
20StrutTop of unit207573 (2)207574207575 (2)
21Louver195578 (7)195578 (14)195578 (21)
22Hardware packageHanger/louver, shipped with heater208347208834 (1)208835 (1)
22ACompression springFor louvers195046 (7)195046 (14)195046 (21)
22BSpring nutA-100-1/2, regular, for hanging heater-158598 (4)
22CFittingAB-288-1/2, U-shape, for hanging heater-207874 (4)
22DLockwasher1/2-inch, for hanging heater-45549 (4)
22EHex nut1/2-13, for hanging heater-45550 (4)
23Vent cap (not shown)6-inch (option CC1)
8-inch (option CC1)		111850--
24Touch-up paint (not shown)11-oz spray can, white-147149 (1)
201805

*Quantity is one (1) for unit size 400, two (2) for unit size 800, or three (3) for unit size 1200 unless otherwise indicated.

Accessories/Options

Manual Shutoff Valve (Option CE1)

Figure 9. Manual Shutoff Valve Assembly (Refer to Table 9)

Figure 9 shows the Manual Shutoff Valve Assembly (Option CE1).

Table 9. Shutoff Valve Components
ComponentDescriptionUnit SizePN
400800, 1200
Shutoff valve assemblyIncludes ball valve and union208103208104
Ball valve1-inch
1-1/4-inch		-159725
159729
Union1-inch
1-1/4-inch		1141-5976

Gas Conversion Kits

NOTE: Refer to the gas conversion kit installation manual listed in Table 1 for kit components and installation instructions.

Table 10. Gas Conversion Kits
Gas ValveGas Valve
Converting to:PropaneNatural GasPropaneNatural Gas
Unit Size40080012004008001200400
Kit PN208877208894208895208878208896208897208879

Vertical Louver Kits (Option CD32)

NOTES:

  • The wider side of the louver blade must always be facing out of the heater.
  • Refer to the vertical louver kit installation manual listed in Table 1 for kit components and installation instructions.
Table 11. Vertical Louver Kits
Unit Size
4008001200
Kit PN208091208884208885

Downturn Nozzle Kits (Options CD57, CD58, and CD59)

NOTES:

  • Option CD57 provides 30-degree air deflection.
  • Option CD58 provides 60-degree air deflection.
  • Option CD59, which includes four-way louvers, provides 30-degree air deflection that may vary with louver adjustment.
Figure 10. Downturn Nozzle Assemblies (Refer to Table 12)

Figure 10 illustrates Downturn Nozzle Assemblies for Options CD57, CD58, and CD59.

  • CD57: Shows a nozzle with a 14-1/8 inches (360 mm) dimension, providing 30-degree air deflection.
  • CD58: Shows a nozzle with a 24-3/8 inches (618 mm) dimension, providing 60-degree air deflection.
  • CD59: Shows a nozzle with a 16-1/2 inches (419 mm) dimension, featuring four-way louvers for 30-degree air deflection.
Table 12. Downturn Nozzle Kits
Unit SizeUnit SizeUnit Size
4008001200
OptionCD57CD58CD59CD57CD58CD59CD57CD58CD59
Kit PN208094208097208100208886208888208890208887208889208891

Hanger Kit (Option CK10)

Figure 11. Hanger Kit (See Table 13)

Figure 11 shows the Hanger Kit (Option CK10), including the kit package, hanger connector, and lockwashers.

Table 13. Hanger Kit Components
ComponentDescriptionPN (Quantity)
Kit packageSwivel hanger kit for 1-inch pipe (option CK10)207938 (1)
Hanger connectorSwivel assembly207939 (4)
Lockwasher45549 (4)

Thermostats (Options CL1 and CL22)

Figure 12. Thermostats (Refer to Table 14)

Figure 12 displays Thermostats for Option CL1 (Single-stage thermostat) and Option CL22 (Two-stage thermostat), along with their respective locking covers (Option CM1 and CM1B).

Table 14. Thermostats and Thermostat Accessories
OptionComponentDescriptionPN
CL1Single-stage thermostat24V, 50–90°F, with fan switch255350
Locking coverOption CM1257464
CL22Two-stage thermostat24V, digital, with fan switch220630
Locking coverOption CM1B257463

Relay Kits (Options CL31 and CL32)

NOTES:

  • There are two relay kit options: one for controlling two heaters (option CL31) and one for controlling up to five heaters (option CL32).
  • For unit size 400, up to six heaters can be connected. For unit size 800, three, and for unit size 1200, two.
  • The relay kit may be installed on the control heater and on up to five additional heaters.
  • Refer to the relay kit installation manual listed in Table 1 for kit components and installation instructions.
Table 15. Relay Kits
OptionCL31*CL32**
Kit PN10412801041286

*Includes components for one control unit and one additional unit.
**Includes components for each additional (four maximum) non-control unit.

Models: LDAP Downflow Unit Heaters, LDAP, Downflow Unit Heaters, Unit Heaters, Heaters

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