Thomas & Betts LDAP 1200 User Manual

Table of Contents

Page

Warnings ......................................... 1

Installation/Operation ............... 2-29

Check/Test/Startup.................. 30-31

Accessories..................................... 32

Maintenance/Service ............... 32-40

Index (by page)

Burners ....................................... 13, 33

Burner Orifice ................................... 35

California Warning Label .................... 2

Clearances ........................................... 6

Installation Codes ............................... 2

Combustion Air .................................... 6

Confined Space ....................................6

Destratification ................................. 18

Dimensions ..........................................4

Electrical Connections ..................... 13

Fan ............................................. 20, 36

Fan Control (Destratification) ....18, 38

Fan Motor .................................... 21, 36

Gas Piping and Pressures................... 10

Gas V alve......................................21, 37

General ................................................ 2

Hazard Intensity Levels...................... 2

Heat Exchanger Maintenance ...........33

High Altitude.................................. 3, 12

High Limit Control ...................... 17, 38

Ignition System ........................... 18, 35

LED Flash Codes ............................... 38

Limit Control .............................. 17, 38

Location (Heater) ................................ 7

Louvers ................................... 3, 10, 32

Maintenance Schedule ................ 32-33

Nozzle (Option) ............................ 3, 32

Pressure Switch

(Combustion Air)............... 5, 17, 37

Replacement Parts.... See Form P-LDAP

Sound Data...........................................8

Startup................................................ 30

Suspending Heater .............................. 8

Technical Data .....................................4

Thermostat (Option) .......................... 14

Throw Data .......................................... 7

Transformer ......................................38

Troubleshooting ......................... 38-40

Uncrating and Preparation ................. 3

Valve Outlet Pressure .........................12

Vent System Maintenance ................ 38

Venter Motor (Heat Section) ............ 35

Venter Motor (Main) ........................ 36

Venting ...............................................26

Wall Mounting ..................................... 9

Warranty..............................................2

Weights ................................................8

Wiring Diagrams .......................... 22-25

Indirect Fired,

Indoor , Downflow,

Packaged Heaters

Installation/Operation FORM RZ-NA I-LDAP

APPLIES TO: Model LDAP

P

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If you smell gas:

1. Open windows.

2. Don't touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier.

The use and storage of gasoline or other flammable vapors and
liquids in open containers in the vicinity of this appliance is
hazardous.

W ARNING: Impr oper installation, adjustment, alteration, service,
or maintenance can cause property damage, injury , or death. Read
the installation, operation, and maintenance instructions
thoroughly before installing or servicing this equipment.

WARNING: Gas-fired appliances are not designed for use in
hazardous atmospheres containing flammable vapors or
combustible dust, in atmospheres containing chlorinated or
halogenated hydrocarbons, or in applications with airborne silicone
substances. See Hazard Levels, page 2.

WARNING: Should overheating occur, or the gas supply fail to
shut off, shut off the manual gas valve to the appliance before
shutting off the electrical supply.

WARNING: Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to inspect
the appliance and replace any gas control that has been under water .

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Reznor

®

Model

LDAP 1200

FOR YOUR SAFETY

FOR YOUR SAFETY

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 1

Hazard Levels of
Warnings in this
Manual

HAZARD INTENSITY LEVELS

1. DANGER: Failure to comply will result in sever e personal injury or death
and/or property damage.

2. WARNING: Failure to comply could result in severe personal injury or
death and/or property damage.

3. CAUTION: Failure to comply could result in minor personal injury and/or
property damage.

1. General

2. Installation
Codes

Special Installations
(Aircraft Hangars/
Repair Garages/
Parking Garages)

All Model LDAP high bay packaged heaters are design certified by ITS for use in
industrial and commercial installations. All models and sizes are available for use
with either natural or propane gas. The type of gas, the input rate, and the electrical
supply requirement are shown on the heater rating plate. Check the rating plate to
determine if the heater is appropriate for the intended installation.

®

The instructions in this manual apply only to Reznor
Installation should be done by a qualified agency in accordance with these instruc-

tions. The qualified service agency installing this heater is responsible for the instal­lation.

These heaters must be installed in accordance with local building codes. In the ab­sence of local codes, in the United States, the heater must be installed in accordance
with the National Fuel Gas Code, ANSI Z223.1. A Canadian installation must be in
accordance with the CSA B149 Installation Codes. These codes are available from
CSA Information Services, 1-800-463-6727. Local authorities having jurisdiction
should be consulted before installation is made to verify local codes and installation
procedure requirements.

Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409
(latest edition), Standard for Aircraft Hangars; in public garages in accordance with
ANSI/NFPA No. 88A (latest edition), S tandard for Parking S tructures; and for repair
garages in accordance with ANSI/NFP A No. 88B (latest edition), S tandard for Repair
Garages. In Canada, installations in aircraft hangars should be in accordance with the
requirements of the enforcing authorities, and in public garages in accordance with
CSA B149 codes.

Model LDAP heaters.

California Warning
Label

Massachusetts
Requirement

3. Warranty

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 2

If the heater is being installed in the state of California, the installer MUST attach a
warning label on the outside of the access door . The California W arning label is shipped
in the owner’s envelope along with this manual, the warranty form, and any other
paperwork that applies.

If installation is in California, select a location on the heater access panel. Be sure the
surface is clean and dry and adhere the label.

If the heater is being installed in the Commonwealth of Massachusetts, this heater
must be installed by a licensed plumber or licensed gas fitter.

Refer to the limited warranty information on the Warranty Card in the "Owner's En­velope".

Warranty is void if ...

a. Wiring is not in accordance with the diagram furnished with the heater.
b. The heater is installed without proper clearance to combustible materials.
c. The heater is connected to a duct system or if the air delivery system is

modified by other than manufacturer-designed accessories.

4. Uncrating and
Preparation

This heater was test operated and inspected at the factory prior to crating and was in
operating condition. If the heater has incurred any damage in shipment, document
the damage with the transporting agency and contact an authorized Reznor Distribu­tor. If you are an authorized Distributor , follow the FOB freight policy procedures as
published by Thomas & Betts for Reznor products.

Check the rating plate for the gas specifications and electrical characteristics of the
heater to be sure that they are compatible with the gas and electric supplies at the
installation site.

MPORTANT: The crate bottom should be removed after the heater is lifted.

I
Shipping brackets are attached with cabinet screws. When removing shipping
brackets, re-insert ALL screws into the cabinet.

Read this booklet and become familiar with the installation requirements of your
particular heater. If you do not have knowledge of local requirements, check with the
local gas company or any other local agencies who might have requirements con­cerning this installation. If the installation is above 2000 ft (610M) elevation, follow
the instructions in Paragraph 5 and Paragraph 12.

Before beginning, make preparations for necessary supplies, tools, and manpower.
Locate the hardware kit supplied with the heater. The plastic bag contains spring
nuts, hex nuts, “U”-shape fittings, lock washers, louvers, and compression springs.

Be sure that all shipped-separate options that were ordered are at the installation site.
Shipped-separate items could include a vent cap, louvers, nozzles, hanger kit, a manual
shutoff valve, a thermostat, multiple heater controls, high temperature tape, and/or a
high altitude kit.

5. High Altitude
Operation

Pressure Switch

Instructions for Changing
Heat section Pressure

NOTE: Do not change the

main pressure switch located
on top of a Size 800 and Size
1200 heater. It is the same for
all elevations.

If the heater is being installed at an elevation above 2000 ft (610M), the input rate
will have to be derated. This is done by adjusting the outlet pressure of the gas valve
and can only be done after the heater is in operation. Follow the instructions in Para­graph 12.

If the heater is being installed at an elevation above 6000 ft (1830M), the heat section
pressure switch(es) will need to be changed. If ordered with the heater as Option
DJ20, the pressure switch is shipped separately.

High Altit u de Unit Pressure Sw it ch (es)

Start-up Cold Equilibrium Hot Setpoint OFF Setpoint ON

QtySize

400 1 1.75 to 1.45 1.00 to 0.80 0.60 0.78 Lt. Blue 197029
800 2 1.85 to 1.55 1.05 to 0.85 0.60 0.78 Lt. Blue 197029

1200 3 2.35 to 1.85 1.50 to 0.95 0.60 0.78 Lt. Blue 197029

Label
Color

Switch

Part No.Differential Pressure (in. w.c.)

Switch(es)

1. In the control compartment of the first heat section, locate the pressure switch.

2. Mark and disconnect the two wires attached to the pressure switch.

3. Mark and disconnect the sensing tubes from the pressure switch.

4. Locate the two screws holding the switch mounting bracket. Remove the screws

(save screws) and the pressure switch.

5. Using the same screws, install the high altitude pressure switch. Attach the

sensing tubes and wires.

6. If installing a Model LDAP 400, the pressure switch change for high altitude is

complete. If installing a Model LDAP 800, repeat Steps 1-5 to change the
pressure switch on the second heat section. If installing a Model LDAP 1200,
repeat Steps 1-5 to change the pressure switches on the second and third heat
sections.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 3

6. T echnical Dat a

38

(965mm)

13-1/8

(333mm)

2-5/8

(67mm)

5

(127mm)

9-7/8

(251mm)

43-1/2

(1,105mm)

RIGHT SIDE VIEW

LINE VOLTAGE
CONNECTION

DISCONNECTION
SWITCH

1 NPT
GAS CONNECTION

m

m

m

m

Model
LDAP
400

Model LDAP 800

Model LDAP 1200

One
Downflow
Heater

One Heater
with Two
Downflow
Heat
Sections

One Heater with
Three Downflow
Heat Sections

Mo del LDAP Size

Input Heating Capa c ity

btuh 400,000 800,000 1,200,000
kw/h 117.1 234.2 351.4

Thermal Efficiency (%)
O ut put Heating Capacity

btuh 332,000 664,000 996,000

kw/h 97.2 194.4 291.6
Gas Co nnection (I nches)
Vent Connection Diameter (Inches)
Contr ol Amps ( 24 volt)
Fu ll Load Amps (208 volt)
Fu ll Load Amps (230 volt)
N orm al Power Consumpti o n @ 2 08V (w a t ts)
N orm al Power Consumpti o n @ 2 30V (w a t ts)
Discharge Air Temperature Rise (°F)

Air Volum e (Heat @ High Speed)

D ischarge Ai r Opening Are a
Outlet Velocity (Heat @ High

Speed)
Air Volume (Destratification @
Medium Speed)
Outlet Velocity (Destrati ficati on
@ Me dium Speed)
Air Volume (Destratification @
Low Speed)
Outlet Velocity (Destrati ficati on
@ L ow S peed)

cfm 5589 11178 16768

3

/minute

2

ft

2

fpm 1521 1521 1521

m/minute 464 464 464

cfm 4650 9300 13950

3

/minute

fpm 1266 1266 1266

m/minute 386 386 386

cfm 3250 6500 9750

3

/minute

fpm 885 885 885

m/minute 270 270 270
Fan Motor HP (Qty)
Fan Motor RPM
Fan Diameter (I nches)

400 800 1200

83 83 83

11-1/41-1/4
68 8

1.0 2.0 3.0

5.6 13.6 19.4

5.5 12.8 18.5
1150 2448 3730
1230 2597 3959

55 55 55

158 317 475

3.67 7.35 11.02

0.34 0.68 1.02

132 263 395

92 184 276

1 (1) 1 (2) 1 (3)
1050 1050 1050

24 24 24

7. Dimensions

FIGURE 1A - Model LDAP 400

30

(762mm)

17-1/8

(435mm)

14-7/8

(378mm)

9-1/8

(232mm)

15-1/4

(387mm)

34-3/8

(873mm)

TOP VIEW

ø 6 FLUE
OUTLET

2-1/8
(54mm)

7/8
(22mm)

AIR DESTRATIFICATION
FAN CONTROL

28-1/8
(714mm)

HANGER LOCATION
1/2 - 13 FEMALE THREAD

THERMOSTAT
CONNECTION

FRONT VIEW

BOTTOM VIEW

DISCHARGE OPENING

9-1/4
(235mm)

1-1/4
(32mm)

23

(584mm)

48-1/2
(1,232mm)

3-1/4
(83mm)

5-5/8
(143mm)

23
(584mm)

NOTE: If an optional
nozzle is added to the
discharge opening,
see dimensions on
page 32.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 4

FIGURE 1B - Model LDAP800 and Model LDAP1200

RIGHT SIDE VIEW

LINE VOLTAGE
CONNECTION

DISCONNECT
SWITCH

1 NPT
GAS CONNECTION

38
(965mm)

13-1/8

(333mm)

2-5/8

(67mm)

5

(127mm)

9-7/8

(251mm)

A Model LDAP1200 with three heat sections is illustrated. A Model LDAP800 has two heat sections. A Model LDAP800
is the same layout as illustrated less the middle heat section.

Size A B

HANGER LOCATION
1/2 - 13 FEMALE THREAD

800

11-7/8

A

(302mm)

1200

inches
mm
inches
mm

46 69

1168 1753

80 103-3/4

2032 2635

14-7/8

(378mm)

COMBUSTION BOX ASSEMBLY

34-3/4

(883mm)

TOP VIEW

B

34-3/4

(883mm)

ø8 FLUE OUTLET

17-1/8

(435mm)

12

(305mm)

13-3/4
(349mm)

(1,346mm)

7/8
(22mm)

1-5/8

(41mm)

53

28-1/8
(714mm)

AIR DESTRATIFICATION
FAN CONTROL

43-1/2
(1,105mm)

46
(1,168mm)

1-1/4 NPT

5-5/8

(143mm)

3-1/4

(83mm)

23

(584mm)

FRONT VIEW

THERMOSTAT
CONNECTIONS

11-3/4

(298mm)

23

(584mm)

(584mm)

DISCHARGE OPENING

11-3/4

(298mm)

23

BOTTOM VIEW

1-1/4
(32mm)

23

(584mm)

NOTE: If optional
nozzles are added to the
discharge openings, see
dimensions on page 32.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 5

8. Clearances

(

)

Heaters must be installed so that the clearances in the table are provided for combus­tion air space, inspection and service, and for proper spacing from combustible con­struction. Clearance to combustibles is defined as the minimum distance from the
heater to a surface or object that is necessary to ensure that a surface temperature of
90°F above the surrounding ambient temperature is not exceeded.

Clearances ­inches/mm

9. Combustion
Air

Size

400
800

1200

Top

inches mm inches mm inches mm inches mm in ches mm inches mm inches mm

12 305 6 152.4 18 457 2 50.8 18 4 57 2 50.8 60 1524
12 305 6 152.4 18 457 2 50.8 18 4 57 2 50.8 60 1524
12 305 6 152.4 18 457 2 50.8 18 4 57 2 50.8 60 1524

This heater must be supplied with the air that enters into the combustion process and
is then vented to the outdoors. Sufficient air must enter the equipment location to
replace that exhausted through the heater vent system. In the past, the infiltration of
outside air assumed in heat loss calculations (one air change per hour) was assumed
to be sufficient. However, current construction methods using more insulation, vapor
barriers, tighter fitting and gasketed doors and windows, weather-stripping, and/or
mechanical exhaust fans may now require the introduction of outside air through wall
openings or ducts.

The requirements for combustion and ventilation air depend upon whether the heater
is located in a confined or unconfined space. An "unconfined space" is defined as a
space whose volume is not less than 50 cubic feet per 1000 BTUH of the installed
appliance. Under ALL conditions, enough air must be provided to ensure there will
not be a negative pressure condition within the equipment room or space.

Flue

Connector

Front

Access Panel

Rear

Disconnect

Side

Side

Bottom

FIGURE 2 - Definition of
Confined Space and
Required Openings for
Combustion Air

Confined Space:
A space whose volume is
less than 50 cubic feet
per 1000 BTUH of the
installed appliance input
rating

(3)

Confined

Space

(3)

(1)

(1)

(2)

(2)

W ARNING: A Model LDAP power-vented heater is designed to take
combustion air from the space in which the heater is installed and is
not designed for connection to outside combustion air intake ducts.
Connecting outside air ducts voids the warranty and could cause
hazardous operation. See Hazard Levels, page 2.

Combustion Air Requirements for a Heater
Located in a Confined Space

Do not install a heater in a confined space without providing wall openings leading to
and from the space. Provide openings near the floor and ceiling for ventilation and air
for combustion as shown in FIGURE 2, depending on the combustion air source as
noted in Items 1, 2, and 3 below.

Add total BTUH of all appliances in the confined space and divide by figures below
for square inch free area size of each (top and bottom) opening.

1. Air from inside the building - openings 1 square inch free area per 1000 BTUH.
Never less than 100 square inches free area for each opening. See (1) in FIGURE 2.

2. Air from outside through duct - openings 1 square inch free area per 2000 BTUH.
See (2) in FIGURE 2.

3. Air direct from outside - openings 1 square inch free area per 4000 BTUH. See
(3) in FIGURE 2.

NOTE: For further details on supplying combustion air to a confined space, see the
National Fuel Gas Code ANSI Z223.1a (latest edition).

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 6

10. Heater
Location

Use the clearances in Paragraph 8; the combustion air requirements in Paragraph 9;
the mounting height requirements, throw information, sound data, and location rec­ommendations below; the weights in Paragraph 11; and the venting requirements in
Paragraph 24 to determine where to suspend the heater.

CAUTION: Do not locate the heater where it may be exposed to
water spray, rain, or dripping water.

Mounting Height

Locate the heater so that it is a minimum of 15 feet (4.6M) above the floor and in
compliance with the clearances in Paragraph 8.

WARNING: If touched, the vent pipe and internal heater surfaces
that are accessible from outside the heater will cause burns. Suspend
the heater a minimum of 15 feet (4.6M) above the floor.

Heater Throw ­All Models

FIGURE 3 - Model LDAP Air Throw (Heat Mode @ High Speed) - Applies to All Sizes

60° Nozzle

Mounting

Height

Standard
Louvers

Standard Louvers

0

X
Y
Z

30° Nozzle

X

30° Nozzle

Y
Z

X

60° Nozzle

Y
Z

= “Rear” of Heater Discharge

0

NOTES:

• X = Distance from “0” to beginning

of floor coverage.

• Y = Distance from “0” to end of

floor coverage.

• Length of floor coverage = Y - X.

• Z = Distance from “0” to the point

where the air velocity drops below
50 feet (15.2M) per minute.

• Throws listed are with standard

louvers facing one direction and
fully open. Throw pattern changes
with louver angle, 2-way louver
direction, and or optional 4-way
louvers.

Throw (feet and meters)

Sta ndard Lou vers 30° Degree No zzle 60° Degree Nozzle

XYZXYZXYZ

Mounting

Height

(feet)
20
30
40
50

Mounting

6.1

9.1

12.2

15.2

Height

5 55 134 40 90 146 70 125 158

8 53 121 44 86 133 76 119 145
12 49 109 47 81 120 N/A N/A N/A
17 45 96 N/AN/AN/AN/AN/AN/A

Sta ndard Lou vers 30° Degree No zzle 60° Degree Nozzle

XYZXYZXYZ

(Meters)

1.5 16.8 40.8 12.2 27.4 44.5 21.3 38.1 48.2

2.4 16.2 36.9 13.4 26.2 40.5 23.2 36.3 44.2

3.7 14.9 33.2 14.3 24.7 36.6 N/A N/A N/A

5.2 13.7 29.3 N/A N/A N/A N/A N/A N/A

Th row ( f eet )

Th row ( meters)

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 7

10. Heater
Location
(cont’d)

Sound Data

Model

LDAP

Size

400
800

1200

µbar = microbar Pa = Pascal

20 ft (6.1M) 25 ft (7.6M) 30 ft (9.1M) 35 ft (10.7M) 40 ft (12.2M)

db Pa µbar db Pa µbar db Pa µbar db Pa µbar db Pa µbar

69 0.058 0.580 65 0.037 0.371 62 0.026 0.258 60 0.019 0.189 57 0.015 0.145
72 0.080 0.800 68 0.051 0.512 65 0.036 0.356 62 0.026 0.261 60 0.020 0.200
74 0.100 1.000 70 0.064 0.640 67 0.044 0.444 64 0.033 0.327 62 0.025 0.250

Sound Chart - Model LDAP

DISTANCE

Location
Recommendations

NOTE: Venting
requirements may affect
location. Consult
requirements in Paragraph 24
before making final
determination.

Hazards of Chlorine

For best results, the heater should be placed with certain rules in mind. In general, a
heater should be located from 15-40 feet (4.6-12.2 M) above the floor. If two or more
heaters are installed in the same room, a general scheme of air circulation should be
maintained for best results.

Suspended heaters are most effective when located as close to the working zone as
possible, and this fact should be kept in mind when determining the mounting heights
to be used. However, care should be exercised to avoid directing the discharged air
directly on the room occupants.

Partitions, columns, counters, or other obstructions should be taken into consider­ation when locating the heater so that a minimum quantity of airflow will be deflected
by such obstacles.

The presence of chlorine vapors in the combustion air of gas-fired heating equipment
presents a potential corrosion hazard. Chlorine found usually in the form of freon or
degreaser vapors, when exposed to flame will precipitate from the compound, and go
into solution with any condensation that is present in the heat exchanger or associated
parts. The result is hydrochloric acid which readily attacks all metals including 300
grade stainless steel. Care should be taken to separate those vapors from the combus­tion process. This may be done by wise location of the heater with regard to exhaust­ers or prevailing wind directions. Chlorine is heavier than air. Keep these facts in
mind when determining installation location of the heater in relation to building ex­haust systems.

11. Hanging or
Mounting
the Heater

Weight (lbs/kg)

Size 400 800 1200

lbs 375 805 1195

kg 170 365 542

and

Suspending the Heater

Installing
Louvers

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 8

Locate the hardware kit shipped with the heater. The kit contains spring nuts, hex
nuts, “U”-shape fittings, and lock washers for suspending the heater. It also includes
louvers and the compression springs needed to install them.

When the heater is lifted for suspension, support the bottom of the heater with the
crate bottom. If the bottom is not supported, damage could occur. Before hanging or
mounting, verify that any screws used for holding shipping brackets were re-installed
in the cabinet.

WARNINGS: Check the supporting structure to be used to verify
that it has sufficient load carrying capacity to support the weight of
the heater . Suspend the heater only fr om the threaded nut retainers
or with a manufacturer provided kit. Do NOT suspend from the
heater cabinet.

See FIGURE 1A or 1B for the appropriate hanging locations, and install the ½”-13
spring nuts in the strut that is attached to the top of the unit. Comply with the require­ments in FIGURE 4A when using threaded rod. If ordered with swivel connectors
for 1” pipe, Option CK10, attach the swivels to the spring nuts according to illustra­tion in FIGURE 4B and suspend with 1” pipe.

Before installing the heater, check the supporting
structure to be used to verify that it has sufficient load­carrying capacity to support the weight.

WARNING: All heaters must be level for proper operation. Do not
place or add additional weight to the suspended heater. Hazard
Levels, page 2.

FIGURE 4A ­Suspending the
Heater with Rods
from the Threaded
Nut Retainers

1/2”-13
Threaded Rod

Hex Nut

Lockwasher

“U”-shape

Fitting

Spring
Nut

Strut

attached to

top of heater.

Be sure the threaded hanger rods are locked to the heater as
illustrated. Recommended maximum hanger rod length is 6
feet (1.8M).

W all Mounting

The heater may be attached to a wall. Place supports as shown in FIGURE 5 and
comply with all guidelines listed.

FIGURE 4B- Swivel Connectors to
Suspend the Heater from 1” Pipe, Option
CK10

Pipe Coupling
Assembly

Hex Nut

“U”-shape

Fitting

Lockwasher

Spring
Nut

Strut

attached to

top of heater.

Be sure the threaded swivel connectors are locked
to the heater as illustrated.

Guidelines for Wall Mounting
Model LDAP Heaters

 Mounting is the responsibility of the

installer. Verify that the supporting
structure has sufficient load-carrying
capacity to support the weight. (See
weights, page 8.)

 Prior to installation, be sure that the

method of support is in agreement with
all local building codes. Check for
service platform requirements.

 Maintain a minimum of 2” (51mm)

clearance from the discharge air
openings to structural supports. Addi­tional clearance will be required if an
optional nozzle is to be field installed.

 Determining the need for installing

vibration or noise isolation is the
responsibility of the installer.

 To prevent potential movement, field-

supplied angles must be placed around
the perimeter of the heater to anchor it
to the structural supports.

 Structural supports must be placed as

shown to prevent damage to the heater.

 All structural supports must be non-

combustible materials.

FIGURE 5 - Wall Mounting

(All structural supports and angles are field supplied.)

All dimensions are measured from centerlines of field-supplied structural supports.

Field-Supplied
Mounting Angles
(MUST be on all

Model LDAP 800

(2 heat sections)

Front View

34-33/64

(877mm)

34-33/64

(877mm)

34-33/64

(877mm)

Model LDAP 1200

(3 heat sections)

Front View

34-43/64

(881mm)

four sides of the
heater.)

Side View

Dimensions are

centerline of the

mounting angles

and apply to all sizes.

34-33/64

(877mm)

(1080mm)

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 9

Model

LDAP 400

(1 heat

section)

Front View

34-11/32

(872mm)

Wall

28-1/4

(718mm)

42-1/2

Airflow direction;

springs are on

the upper end.

Airflow direction;

springs are on
the lower end.

l

11. Installing
Heater and
Louvers
(cont’d)

Installing Louvers

NOTE: Do not install louvers
if installing a nozzle. Follow
the instructions shipped with
the nozzle.

FIGURE 6 - Use
Compression Springs to
Install Louvers in the
Discharge Opening(s)

CAUTION: To avoid getting
burned, adjust louvers while
heater is not operating. If
adjusting louvers while
heater is operating, wear
gloves.

After the unit is suspended/mounted, install the air directional louvers or optional
nozzle. If an optional nozzle is being installed, follow the instructions included with
the nozzle. If a nozzle is not being used, install the louvers in the discharge opening(s).
Louvers and springs are in the hardware kit shipped with the heater.
Before actually installing the louvers, note the louver curve and determine how the
louvers should be positioned to provide the optimal throw pattern. Opening is square
so louvers may be installed either horizontal or vertical. Louvers may be installed
with the curve all the same direction (either way) or the right half one way and left
the other as illustrated in FIGURE 6.

Louver Installation Instructions:

1) With the wider section of the louver facing out of the heater, place one of the compres-

sion springs over the tab on the notched end of a louver. The end of the louver with the
spring will fit in any direction in the square opening. How the louver turns depends on
which end of the louver is inserted first.

2) Depending on the throw pattern selected, push the louver tab with the spring into a

hole in the discharge opening and insert the louver tab on the other end into the
corresponding hole on the opposite side.

3) Continue until all louvers are installed.

Adjust the louvers to provide the

desired throw pattern.

Compression Spring

Wider side of the louver
blade must always be
facing out of the heater.

Airflow direction depends on
how the louvers are installed.

12. Gas Piping

and
Pressures

Sizing Gas Supply
Line

W ARNING: All com­ponents of a gas supply
system must be leak
tested prior to placing
equipment in service.
NEVER TEST FOR
LEAKS WITH AN OPEN
FLAME. Failure to
comply could result in
personal injury, pr operty
damage or death.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 10

WARNING: This appliance is equipped for a maximum gas supply
pressure of 1/2 psi, 3.5 kPa, or 14 inches water column. Supply
pressure greater than 1/2 psi requires installation of an additional
lockup-type service regulator external to the heater.

W ARNING: PRESSURE TESTING SUPPLY PIPING

Test Pressures Above 1/2 PSI: Disconnect the heater and manual valve from the
gas supply line which is to be tested. Cap or plug the supply line.

T est Pressur es Below 1/2 PSI: Before testing, close the manual valve on the heater .

Capacity of Piping

Specific Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)

Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)

Length Diame te r of Pipe

of 1" 1-1/4" 1-1/2" 2" 2-1/2"

Pipe Natura

20' 350 214 730 445 1100 671 2100 1281 3300 2013
30' 285 174 590 360 890 543 1650 1007 2700 1647
40' 245 149 500 305 760 464 1450 885 2300 1403
50' 215 131 440 268 670 409 1270 775 2000 1220
60' 195 119 400 244 610 372 1105 674 1850 1129
70' 180 110 370 226 560 342 1050 641 1700 1037
80' 170 104 350 214 530 323 990 604

90' 160 98 320 195 490 299 930 567 1500 915
100' 150 92 305 186 460 281 870 531 1400 854
125' 130 79 275 168 410 250 780 476 1250 763
150' 120 73 250 153 380 232 710 433 1130 689
175' 110 67 225 137 350 214 650 397 1050 641
200' 100 61 210 128 320 195 610 372 980 598

Note: When sizing supply lines, consider possibilities of future expansion and increased requirements.

Propane Natural Propane Na t uralPropane NaturalPropane Natural Propane

Refer to National Fuel Gas Code for additional information on line sizing.

- Cubic Feet per Hour based on 0.3" w.c. Pressure Drop

1600

976

Gas Connection Size

Ga s Connection - inches/mm

400

800

1200

Size

inches

mm

inches

mm

inches

mm

Natural

Gas

25.4 25.4

1-1/4 1-1/4

31.8 31.8

1-1/4 1-1/4

31.8 31.8

Propane

Gas

11

FIGURE 7 - Gas
connection is at the pipe
nipple that extends outside
the cabinet.

IMPORTANT: Two pipe

wrenches are required when
installing gas piping. The gas
pipe that is supplied with the
heater MUST be held with a
pipe wrench to prevent damage
to the heater.

NOTE: Gas Conversion Kits
are available for changing
from propane gas to natural
gas or natural gas to propane
gas. A factory-authorized
conversion kit MUST be
used.

Valve Outlet or
Orifice Pressure
Setting

W ARNING: V alve outlet
gas pressure must never
exceed 3.5" w .c. for
natural gas and 10" w .c.
for propane gas.

All piping must be in accordance with requirements outlined in the National Fuel
Gas Code ANSI/Z223.1a (latest edition) or CSA-B149.1 and B149.2 (See Paragraph

2). Gas supply piping installation should conform with good practice and with local
codes. Support gas piping with pipe hangers, metal strapping, or other suitable mate­rial; do not rely on the heater to support the gas pipe.

The heater is orificed for operation with natural gas having a heating value of 1000
(± 50) BTUH per cubic ft or propane gas with a heating value of 2500 (± 100) BTUH
per cubic ft. If the gas at the installation does not meet these specifications, consult
the factory for proper orificing.

Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petro­leum gas or any other chemical constituents of the gas being supplied.

Install a ground joint union and manual shutoff valve upstream of the heater control
system, as shown in FIGURE 7. Installation of a trap with a minimum 3" (76mm)
drip leg is required.

To connect the gas, the heater is equipped with a nipple that extends outside the
cabinet.

Leak-test all connections by brushing on a leak-detecting solution.

Ground

To Gas Valve
(inside the
cabinet)

Pipe nipple extending

outside the cabinet.

Joint Union

To Gas Valve
(inside the
cabinet)

Manual shutoff

Drip
Leg

Ground

Horizontal Supply

From Gas Supply
(horizontal or vertical)

Vertical Supply

Drip

Joint

Union

Leg

Manual
shutoff

Measuring valve outlet gas pressure cannot be done until the heater is in operation. It
is included in the steps of the "Check-Test-Start" procedure in Paragraph 25. The
following warnings and instructions apply. Model LDAP 400 has one gas valve;
Model LDAP 800 has two gas valves; and Model LDAP 1200 has three gas valves.

For Natural Gas: When the heater leaves the factory, the combination gas valve(s)
is set so that the valve outlet gas pressure for a single stage valve or high fire of a two
stage valve is regulated to 3.5" w .c. Low fire on a two-stage valve (Size 400 only) is
set to 1.8” w .c. Inlet supply pressure to the heater for natural gas must be a minimum
of 5" w.c. or as noted on the rating plate and a maximum of 14" w.c.

For Propane Gas: When the heater leaves the factory , the combination gas valve(s)
is set so that the valve outlet gas pressure for a single stage valve or high fire of a two
stage valve is regulated to 10" w.c. Low fire on a two-stage valve (Size 400 only) is
set to 5.0” w.c. Inlet supply pressure to the heater for propane gas must be a mini­mum of 11" w.c. and a maximum of 14" w.c.

Before attempting to measure or adjust valve outlet gas pressure, the inlet
supply pressure must be within the specified range both when the heater is in opera­tion and on standby. Incorrect inlet pressure could cause excessive valve outlet gas
pressure immediately or at some future time. If natural gas supply pressure is too
high, install a regulator in the supply line before it reaches the heater. If natural gas
supply pressure is too low , contact your gas supplier .

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 11

12. Gas

g

g

Pressures
(cont’d)

Check V alve Outlet
Pressure (can only
be done after heater
is operating)

NOTE: If operating at high
altitude, outlet pressure
requires adjustment. Follow
instructions below.

NOTES: If installation is
above 6000 ft (1830M), a
high altitude pressure switch
is required on each heat
section (all sizes). See
Paragraph 5.
The main combustion air
pressure switch (Sizes 800
and 1200 only) does not need
to be changed for high

Instructions

1) Locate the 1/8” output pressure tap on the first valve (See FIGURE 8). With

the manual valve turned off to prevent flow to the gas valve, connect a manom-

eter to the 1/8" pipe outlet pressure tap in the valve. NOTE: A manometer (fluid-

filled gauge) is recommended rather than a spring type gauge due to the difficulty

of maintaining calibration of a spring type gauge.

2) Open the manual valve and operate the heater. Measure the outlet pressure of

the gas valve. To measure low-stage pressure on a Size 400 unit equipped with a

two-stage valve, disconnect the wire from the “HI” terminal on the valve. (Be

sure to reconnect wire after testing.)

Normally when operating at sea level, adjustments should not be necessary to the

factory setting(s). (For high altitude settings, see below .) If adjustment is neces-

sary, remove the cap from the adjustment screw(s). Set pressure to correct

settings by turning the regulator screw IN (clockwise) to increase pressure. Turn

regulator screw OUT (counterclockwise) to decrease pressure.

3) If installing a Model LDAP 800, repeat to verify outlet pressure on second valve.

If installing a Model LDAP 1200, repeat to verify outlet pressure check on

second and third valve.

Derate by Valve Outlet Pressure Adjustment for High
Altitude Operation

Instructions for High Altitude Derate

1. Determine the required valve outlet pressure for the elevation where the heater

will be operating. If unsure of the elevation, contact the local gas supplier.

Valve Outlet Pressure Settings by Elevation

altitude installation.

FIGURE 8 - Top View of
Valves showing Outlet
Pressure Tap and
Adjustment Locations

Single-Stage Valve

Output

Adjustment

Screw

Inlet

Pressure

Tap

1/8” Output

Pressure Tap

Two -Stage Valve (optional

Feet Meters

0-2000 0-610 3.5 2.0 10.0 5.6
2001-3000 611-915 3.1 1.7 8.8 5.0
3001-4000 916-1220 3.0 1.7 8.5 4.8
4001-5000 1221-1525 2.8 1.6 8.1 4.6
5001-6000 1526-1830 2.7 1.5 7.7 4.4
6001-7000 1831-2135 2.6 1.5 7.4 4.2
7001-8000 2136-2440 2.5 1.4 7.1 4.0
8001-9000 2441-2745 2.4 1.3 6.7 3.8

9001-10000 2746-3045 2.4 1.3 6.7 3.6

Feet Meters

0-2000 0-610 3.5 2.0 10.0 5.6
2001-4500 611-1373 2.8 1.6 8.1 4.6

on Model LDAP 400 only)

Adjust High

Pressure

Output

Inlet

Pressure

Tap

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 12

Adjust Low
Pressure
Output

1/8” Output

Pressure

Tap

2. Locate the 1/8” output pressure tap on the first valve (See FIGURE 8). Turn

the knob on the top of the valve to “OFF”. Connect a manometer to the 1/8"
pipe outlet pressure tap in the valve. Use a water column manometer that is
readable to the nearest tenth of an inch.

Single-Stage and Two-Stage High Fire - Turn the knob on the top of the

3.

valve to “ON”. Remove the cap from the pressure adjusting screw and adjust
the gas train pressure to the pressure selected from the table above. Adjust
pressure by turning the regulator screw IN (clockwise) to increase pressure or
OUT (counterclockwise) to decrease pressure.

Two-Stage Low Fire - Disconnect the wire from the “HI” terminal on the gas
valve and check the low fire pressure. Turn the regulator screw to adjust the low
fire outlet pressure to the “Low Fire” pressure selected from the table. Re­connect the wire to the gas valve.

M anifold Pressure Settings by Altitude for the UNI T ED STATES

Al titude Natural Gas (inches w.c .) Propane Gas (i nc he s w.c .)

Single-Stage and

Two-Sta

Ma nifold Pressure Settings b y Altitude for CANADA

Al titude Natural Gas (inches w.c .) Propane Gas (i nc he s w.c .)

Single-Stage and

Two-Sta

e High Fire

e High Fire

Two-Stage

Low Fire

Two-Stage

Low Fire

Single-Stage and

Two-Stage High Fire

Single-Stage and

Two-Stage High Fire

Two-Stage

Low Fire

Two-Stage

Low Fire