Thomas & Betts LDAP 1200 Manuale Utente

All electrical wiring and connections, including electrical grounding MUST be made
in accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or,
in Canada, with CSA Standard C22.1. In addition, the installer should be aware of
any local ordinances or gas company requirements that might apply.

Check the rating plate on the heater for the supply voltage and current requirements.
A dedicated line voltage supply with disconnect switch should be run directly from
the main electrical panel to the heater. All external wiring must be within approved

Each heat section in this heater has a one-piece 

T

CORE

2

®

 burner assembly (U.S.

Patent No. 6,889,686) designed to provide controlled flame stability without lifting or
flashback with either natural or propane gas.

The burner can be removed as a unit for inspection or service; see Maintenance
Section for removal instructions.

The input and/or the capacity of the heater changes with the derate. The tables below
list inputs and capacities at altitudes from sea level to 10,000 ft (3045M) for the U.S.
and to 4500 ft (1373M) for Canada.

0 - 2000

0 - 610

400000

332000

300000

800000

664000

400000

1200000

996000

400000

2001 - 3000

611 - 915

376000

312080

282000

752000

624160

376000

1128000

936240

376000

3001 - 4000

916 - 1220

368000

305440

276000

736000

610880

368000

1104000

916320

368000

4001 - 5000

1221 - 1525

360000

298800

270000

720000

597600

360000

1080000

896400

360000

5001 - 6000

1526 - 1830

352000

292160

264000

704000

584320

352000

1056000

876480

352000

6001 - 7000

1831 - 2135

344000

285520

258000

688000

571040

344000

1032000

856560

344000

7001 - 8000

2136 - 2440

336000

278880

252000

672000

557760

336000

1008000

836640

336000

8001 - 9000

2441 - 2745

328000

272240

246000

656000

544480

328000

984000

816720

328000

9001 - 10000

2746 - 3045

320000

265600

240000

640000

531200

320000

960000

796800

320000

0 - 2000

0 - 610

400000

332000

300000

800000

664000

400000

1200000

996000

400000

2001 - 4500

611 - 1373

360000

298800

270000

720000

597600

360000

1080000

896400

360000

4. Turn up the thermostat. Cycle the burners once or twice to properly seat the

adjustment spring in the valve.

Re-check the pressure(s). When the outlet pressure is right for the installation,

remove the manometer and replace the cap.

Check for leak at the pressure tap fitting.

5. If installing a Model LDAP 800, repeat the adjustment at the second single-stage

gas valve. If installing a Model LDAP 1200, repeat the adjustment at the second
and third single-stage gas valves.

6. With the heater operating determine that the inlet pressure to the heater for

natural gas is between 5 and 13.5 inches w.c. and for propane between 10 and
13.5 inches w.c. Take this reading at the inlet pressure tap of the first gas valve.
If the inlet pressure is not within the specified range, the inlet pressure must be
corrected and Steps 3 - 5 repeated.

7. Find the High Altitude Adjustment label in the plastic bag that contained these

instructions. Using a permanent marker, fill-in the appropriate information from
the “BTUH Input & Capacity by Altitude” Table, below. Select a location for the
label on the outside of the heater main access panel so that it will be conspicuous
to anyone operating or servicing the heater. Be sure the surface is clean and dry
and adhere the label.