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0 mechanical (cont’d), 1 gas piping and pressures (cont’d), 2 unit discharge – Reznor LDAP Unit Installation Manual User Manual

Page 14: Instructions for high altitude derate (cont’d)

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Form I-LDAP, P/N 207733R6, Page 14

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. Re-connect the wire to the gas valve.

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.

6.0 Mechanical

(cont’d)

6.1 Gas Piping

and Pressures

(cont’d)

6.1.2 Valve Outlet

or Orifice Pressure

Setting (cont’d)

High Altitude

Capacity Changes

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.

BTUH Inputs & Capacities by Altitude in the UNITED STATES for Model LDAP

Altitude

Normal

Input

Thermal

Output

Capacity

Minimum

Input

Normal

Input

Thermal

Output

Capacity

Minimum

Input

Normal

Input

Thermal

Output

Capacity

Minimum

Input

Feet

Meters

Size 400

Size 800

Size 1200

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

BTUH Inputs & Capacities by Altitude in the CANADA for Model LDAP

Altitude

Normal

Input

Thermal

Output

Capacity

Minimum

Input

Normal

Input

Thermal

Output

Capacity

Minimum

Input

Normal

Input

Thermal

Output

Capacity

Minimum

Input

Feet

Meters

Size 400

Size 800

Size 1200

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

6.2 Unit Discharge

All Model LDAP heaters have discharge louvers but are available with addi-

tional louvers and/or nozzle discharge air options.
Optional louver and discharge nozzles are shipped separately for field instal-

lation. Model LDAP 800 and 1200 heat sections have independent airflow and

Instructions for High Altitude Derate (cont’d)