REZNOR LDAP Downflow Unit Heaters Instruction Manual

Revision: LDAP-RPL (04-22) 271892-A
Supersedes: LDAP-RPL (01-22) 271892-A REPLACEMENT PARTS FOR DOWNFLOW UNIT HEATERS
MODEL LDAP

REFERENCES

Table 1. Related Technical Manuals Available from Factory Distributor

Type| Form| **PN**
Installation/operation/maintenance| LDAP-IOM| 207733
Gas conversion kit installation| LDAP-GC| 208881
Heat exchanger gasket kit installation| LDAP-HX| 209212
High-elevation pressure switch replacement instructions| LDAP-DJ20| 208081
Vertical louver kit installation| LDAP-CD32| 208898
Downturn nozzle kit installation| LDAP-CD57,58,59| 208899
Relay kits for multiple heater control| LDAP-CL31,32| 1041278
Also available at www.reznorhvac.com.

WARRANTY

The heater has a 1-year limited warranty. Contact your Distributor for details.

CABINET CONFIGURATIONS

These indirect-fired, indoor, downflow packaged heaters are available in three different configurations, as shown in Figure 1.
UNIT SIZE 400ONE DOWNFLOW HEATER
UNIT SIZE 800 ONE HEATER WITH TWO DOWNFLOW HEAT SECTIONS
UNIT SIZE 1200 ONE HEATER WITH THREE DOWNFLOW HEAT SECTIONS
Figure 1. Cabinet Configurations

SERIAL NUMBER

NOTE: The serial number is located on the unit’s rating plate.

Decode serial numbers as follows:

All 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
All 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)

ELECTRICAL COMPONENTS

VENTER ASSEMBLY (UNIT SIZES 800 AND 1200) Figure 2. Electical Components (Refer to Table 3)

Table 3. Electrical Components

Item No.| Component| Description| Unit Size
400/800/1200
PN (Quantity)**
1| Terminal board| 24V. 7-pole| 164545
2| Destratification relay SPST| 24V coil, with base (PN 211415). units manufactured after AUG 2011| 211411
24V coil. units manufactured before SEP 2011| 98118
2A| Relay replacement kit| Destratification relay, replaces PN 98118| 983527
3| Vent permissive relay. SPST| (AK2), with base (PN 211415) units manufactured after AUG 2011| –| 211413
230V (AK3), with base (PN 711415), units manufactured after AUG 2011| 211414
Units manufactured before SEP 2011| 130821
3A| Rela re dacement kit| Vent iermissive relay relaces PN 130821| 263529
4| Limit control| 240T, silver dot| 202048
5| Terminal strip| 7-pole| 164544 (2)1 164544 (5)1 164544 (7)
6| Sensor| Flame| 195292
7| Heat permissive relay. SPST| 24V coil . with base (PN 711415), units manufactured after AUG 2011| 711411
24V coil, units manufactured before SEP 2011| 98118
7A| Relay replacement kit| Heat permissive relay, replaces PN 98118| 263527
8| Ignitor| 175272
9| Fan permissive relay SPDT| 208V (AK2). with base (PN 211415), units manufactured after AUG 2011| –| 211413
230V (AK3)  with base (PN 211415) units manufactured after AUG 2011| 711414
Units manufactured before SEP 2011| 157808
9A| Relay replacement kit| Fan permissive relay, replaces PN 157808| 263529
10| DSI control board| Circuit board| 195265
10A| Fuse| DSI control board| 201685
11| Gas valve| Single-stage. natural gas. serial No. code Y3 or Z8| 196981
Two-stage. natural gas. serial No code Y9 or 5A| 197067
Single-stage. propane. serial No code Y5 or 1A| 196983
Two-stage, propane. serial No code Y7 or 3A| 197065
12| Transformer| 208/240V, 40VA| 19453Q
13| Disconnect switch| 40A| 207948 1 207948 (1)
14| High limit control| Manual reset, 150′, white dot| 112753
15| Control| Destratification fan, adjustable| 207929 1 707929 (1)
16| Capacitor| Fan motor, 20pF C 370VAC| 207582
16A| Boot| Capacitor (Syntex M-78)| 103182
17| Capacitor| Venter motor| 195641
18| Fan motor| 208230V. 1-HP 3-speed (AOS #F48U34A13)| 707734
19| Venter motor| 208240V. heat section| 196830
20| Pressure switch| Heat section, yellow label, <6000-foot elevation| 197028
Pressure switch| Heat section. light blue label. :.16000-foot elevation| 197029
21| Wiring harness (not shown)| 5-circuit| 208043
22| 9-circuit| 208224
23| Wire (not shown)| Ignitor| 708231
24| Venter motor| Flue collection (AOS C199)| —| 16074
25| Pressure switch| Flue 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.

ELECTRICAL COMPONENTS—CONTINUED

Item 1: Terminal Board| Item 5: Terminal Strip| Item 11: Gas Valve
---|---|---
Items 2, 3, 7, and 9: Relay and Base| Item 6: Flame Sensor
Item 4: Limit Control| Item 8: Ignitor| Item 12: Transformer| Item 13: DisconnectSwitch
Item 11: DSI Control Board| Item 15: Fan Control| Item 14: High Limit Control| Item 17: Venter Motor Capacitor
Item 20:  Pressure Switch, Heat Section|

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

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.

HEAT SECTION VENTER MOTOR AND WHEEL ASSEMBLYFLUE COLLECTION BOX SECTION VENTER MOTOR AND WHEEL ASSEMBLYFigure 4. Venter Components (Refer to Table 4)
VENTER COMPONENTS—CONTINUED

Table 4. Venter Components

Item No.| **Component| ****Description| Unit Size
400| 800| 1200
PN (Quantity) *
Heat Section
1| Housing (not shown)| Venter| 209205
1A| Gasket (not shown)| Venter housing| 196013
2| Pressure tap (not shown)| Static| 116043 (2)| 116043 (4)| 116043 (6)
3| Venter motor| 208/240V (see Figure 2 )| 236163
4| Mounting bracket ****| Venter| 195072
5| Isolator| Venter| 194534 (3)| 194534 (6)| 194534 (9)
6| Isolator bushing| Venter| 194803 (3)| 194803 (6)| 194803 (9)
7| Plate| Venter motor| 194910
8| Gasket| Venter motor plate| 201472
9| Clip **| Venter motor| 194805 (3)| 194805 (6)| 194805 (9)
9A| Venter motor clip screw **| Slotted, #8-32 × 1/2| 92851 (3)| 194806 (6)| 194806 (9)
10| Venter motor plate screw| #10-24 × 3/4| 202949 (3)| 202949 (6)| 202949 (9)
10A| Hex nut| #10-24| 111377 (3)| 111377 (6)| 111377 (9)
11| Wheel| Venter| 195666
12| Fan| Cooling| 196035
Flue Collection Box Section
13| Housing| Venter| ** —| 151343 (1)
13A| Gasket| Venter (not shown)| 149857 (1)
14| Motor and wheel assembly| Venter| 1024267 (1)
14A| Motor| Venter (see Figure 2 and Figure 3* )| 16074 (1)
14B| Base assembly| Venter motor| 207837 (1)
14C| Capscrew| Hex head, 1/4-20 × 3/4| 16246 (4)
14D| Washer| Plain, 3/8-inch SAE| 6593 (4)
14E| Hex nut| 1/4-20, with toothed washer| 10650 (4)
14F| Wheel| Venter| 8735 (1)
15| Probe assembly| Flow-sensing| 151559 (1)
16| Tube, silicone rubber| 13 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)

Table 5. Fan Components

**Item No.**

| **Component| ****Description**|

Unit Size

400

|

800

|

1200

PN (Quantity) *****

1| Fan motor| 208/230V, 1-HP, 3-speed (A.O. Smith #F48U34A13)| 207734
2| Guard| Fan| 170086
2A| Screw| Fan guard| 96452 (4)| 96452 (8)| 96452 (12)
2B| Isolator| Fan guard, with washer| 96451 (4)| 96451 (8)| 96451 (12)
2C| Tinnerman nut| Fan guard| 54633 (4)| 54633 (8)| 54633 (12)
2D| Nut| Motor to fan guard| 216942 (4)| 216942 (8)| 216942 (12)
2E| Flat washer| Motor to fan guard| 204323 (8)| 204323 (16)| 204323 (24)
3| Blade| Fan| 207729
***** 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)

Table 6. Heat Exchanger Components

Item No.

|

**Component**

|

**Description**

|

Unit Size

400

|

800

|

1200

PN (Quantity) *****

1| Heat exchanger assembly **| With gasket kit, aluminized steel| 209209
With gasket kit, 409 stainless steel| 209210
1A| Gasket kit| Heat exchanger assembly (field-installed)| 209211
1B| ****

Header panel gasket

| Top| 207727
1C| Side| 207728 (2)| 207728 (4)| 207728 (6)
1D| Bottom| 207727
2| Panel| Rear| 207553| 207553| 207553
3| Heat exchanger support| Middle| 207554| 207554| 207554
4| Bottom (not shown)| 207555| 207555| 207555
5| Channel| Tube support| 207552 (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)

Table 7. Burner Assembly Components

Item No.

|

**Component**

|

**Description**

|

Unit Size

400

|

800

|

1200

PN (Quantity) *****

1| Burner assembly| Includes venturi tubes| 195243
2| ** Burner shield| Side| 195500 (2)
3| Bottom| 195521
4| Top| 195511
5| Sight-hole cover| Burner shield| 10756
6| Support| Burner| 196598 (6)| 196598 (12)| 196598 (18)
7| Burner orifice (not shown)| 9.6 mm, natural gas| 196897
5.8 mm, propane| 196905
8| Orifice adapter (not shown)| 3/4 × 3/8 bushing| 194809
8A| Orifice adapter nut (not shown)| 1/2-inch| 165702
*** 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)

Table 8. Cabinet Components

Item No.| **Component| ****Description| Unit Size
400| 800| 1200
PN (Quantity) *
1| Panel assembly| Bottom| 207677| 207677| 207677
2| Air baffle| Side, interior (not shown)| 207610 (2)| 207610 (4)| 207610 (6)
3| Side panel| Right| 207558| 207558| 207558
4| Left| 207559| 207559| 207559
5| Intermediate panel| Left| —| 208026 (1)| 208026 (2)
6| Right| —| 208027 (1)| 208027 (2)
7| Splice plate| Top and bottom| —| 207566| 207566 (4)
8| Fan panel| Top| 207564| 207564 (1)| 207564 (1)
208044 (1)| 208044 (2)
9| Plug| Hole| 16452| —
10| Outlet collar| 6-inch| 195662| —
11| Splice plate| Assembly| —| 207731| 207731 (4)
12| Flue wrapper assembly| Heat section| 207561| 207561| 207561
12A| Pressure tap| Static, in flue wrapper| 116043| 116043| 116043
12B| Side gasket| Heat section flue wrapper| 170037 (2)| 170037 (4)| 170037 (6)
12C| Top/bottom gasket| Heat section flue wrapper| 170039 (2)| 170039 (4)| 170039 (6)
13| ** System flue collection box| Bottom and rear| —| 207568 (1)| 207569 (1)
14| Top and front| —| 207570 (1)| 207571 (1)
15| End| —| 207579 (1)
16| Exhauster end| —| 207580 (1)| 207581 (1)
17| Gasket| Fan panel/flue collection box| —| 207732| 207732
18| Door| Access| 207572| 207572| 207572
19| Handle| Door| 196881| 196881 (1)| 196881 (1)
20| Strut| Top of unit| 207573 (2)| 207574| 207575 (2)
21| Louver| 195578 (7)| 195578 (14)| 195578 (21)
22| Hardware package| Hanger/louver, shipped with heater| 208347| 208834 (1)| 208835 (1)
22A| Compression spring| For louvers| 195046 (7)| 195046 (14)| 195046 (21)
22B| Spring nut| A-100-1/2, regular, for hanging heater| 158598 (4)
22C| Fitting| AB-288-1/2, U-shape, for hanging heater| 207874 (4)
22D| Lockwasher| 1/2-inch, for hanging heater| 45549 (4)
22E| Hex nut| 1/2-13, for hanging heater| 45550 (4)
23| Vent cap (not shown)| 6-inch (option CC1)| 111850| —
8-inch (option CC1)| —| 147149 (1)
24| Touch-up paint (not shown)| 11-oz spray can, white| 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)

Table 9. Shutoff Valve Components

**Component| ****Description| Unit Size
400| 800, 1200
PN**
Shutoff valve assembly| Includes ball valve and union| 208103| 208104
Ball valve| 1-inch| 159725| —
1-1/4-inch| —| 159729
Union| 1-inch| 1141| —
1-1/4-inch| —| 5976

Figure 9. Manual Shutoff Valve Assembly (Refer to Table 9)
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 Valve
Single-Stage| Two-Stage
Converting to:
Propane| Natural Gas| Propane| Natural Gas
Unit Size
400| 800| 1200| 400| 800| 1200| 400
Kit PN
208877| 208894| 208895| 208878| 208896| 208897| 208879| 208880

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
400| 800| 1200
Kit PN
208091| 208884| 208885

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)

Table 12. Downturn Nozzle Kits

Unit Size
400| 800| 1200
Option
CD57| CD58| CD59| CD57| CD58| CD59| CD57| CD58| CD59
Kit PN
208094| 208097| 208100| 208886| 208888| 208890| 208887| 208889| 208891

Hanger Kit (Option CK10) Figure 11. Hanger Kit (See Table 13)

Table 13. Hanger Kit Components

Component| Description| PN (Quantity)
Kit package| Swivel hanger kit for 1-inch pipe (option CK10)| 207938 (1)
Hanger connector| Swivel assembly| 207939 (4)
Lockwasher| 45549 (4)

Thermostats (Options CL1 and CL22) Figure 12. Thermostats (Refer to Table 14)

Table 14. Thermostats and Thermostat Accessories

Option| Component| Description| PN
CL1| Single-stage thermostat| 24V, 50–90°F, with fan switch| 255350
Locking cover| Option CM1| 257464
CL22| Two-stage thermostat| 24V, digital, with fan switch| 220630
Locking cover| Option CM1B| 257463

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

Option
CL31 *| CL32 **
Kit PN
1041280| 1041286
* Includes components for one control unit and one additional unit.
** Includes components for each additional (four maximum) non-control unit.

Specifications and illustrations subject to change without notice or incurring obligations.
Latest version of this manual is available at www.reznorhvac.com.
©2022 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.
LDAP-RPL (04-22) 271892-A http://www.reznorhvac.com

Documents / Resources

| REZNOR LDAP Downflow Unit Heaters [pdf] Instruction Manual
LDAP Downflow Unit Heaters, LDAP, Downflow Unit Heaters, Unit Heaters, Heaters
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References

• Reznor HVAC

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