Thomas & Betts LDAP 1200 warranty Burners 14.Electrical Supply and Connections, Supply Wiring

High Altitude Capacity Changes

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.

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	Thermal Output	Minimum	Normal	Thermal Output	Minimum	Normal	Thermal Output	Minimum
			Input	Capacity	Input	Input	Capacity	Input	Input	Capacity	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	Thermal Output	Minimum	Normal	Thermal Output	Minimum	Normal	Thermal Output	Minimum
			Input	Capacity	Input	Input	Capacity	Input	Input	Capacity	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

13.Burners

14.Electrical Supply and

Connections

Supply Wiring

Each heat section in this heater has a one-piece TCORE2® 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.

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

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 13