Reznor LDAP Unit Installation Manual - Manual (Page 14)

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)