York D2CE Thermostat, Power And Control Wiring, OPTIONAL ELECTRIC HEATERS DCE Models, Pipe Sizing

530.18-N11Y

THERMOSTAT

The room thermostat should be located on an inside wall approximately 56" above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow manufacturer’s instructions enclosed with thermostat for general installation procedure. Seven color coded insulated wires should be used to connect thermostat to unit.

POWER AND CONTROL WIRING

Field wiring to the unit must conform to provisions of the National Electrical Code, ANSI / NFPA No. 70 (in U.S.A.), current Canadian Electrical Code C22.1 (in Canada) and/or local ordinances. The unit must be electrically grounded in accordance with NEC and CEC (as specified above) and/or local codes. Voltage tolerances which must be maintained at the compressor terminals during starting and running conditions are indicated on the unit Rating Plate.

The internal wiring harness furnished with this unit is an integral part of a ETL and CGA design certified unit. Field alteration to comply with electrical codes should not be required.

A fused disconnect switch should be field provided for the unit. The switch must be separate from all other circuits. Wire entry at knockout openings require conduit fittings to comply with NEC (in U.S.A.), CEC (in Canada) and/or local codes. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram and the same minimum gauge as the replaced wire.

Electrical line must be sized properly to carry the load. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.

CAUTION: When connecting electrical power and control wiring to the unit, waterproof type connectors MUST BE USED so that water or moisture cannot be drawn into the unit during normal operation. The above waterproofing conditions will also apply when installing a field-supplied disconnect switch.

Refer to Typical Field Wiring Figure for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information.

OPTIONAL ELECTRIC HEATERS (DCE Models)

The factory installed heaters are wired for single point power supply. Power supply need only be brought into the single point terminal block and thermostat wiring to the low voltage terminal block located in the upper portion of the unit control box.

These ETL and CGA approved heaters are located within the central compartment of the unit with the heater elements extending into the supply air chamber. Refer to the Dimension and Clearances figure for access panel location.

Fuses are supplied, where required, by the factory. Some KW sizes require fuses and others do not. Refer to the Unit Application Data Table 1 for minmum CFM limitations and to Electrical Data Table.

TABLE 2 - GAS HEAT APPLICATION DATA

Input Capacity (Mbh)				Output Capacity (Mbh)				Temp.
0 To		2,000 To		0 To	2,000 To	Gas		Rise ° F
2,000 Feet		4,500 Feet		2,000 Feet	4,500 Feet	2		At
Above		Above		Above	Above	Rate		Full Input 3
						3
Sea Level		Sea Level1		Sea Level	Sea Level1	(Ft. /Hr.)
Max.	Min.	Max.	Min.	Max.	Max.		Min.		Max.
300	150	270	135	240	213	279	20		50
400	200	360	180	320	281	372	30		60

NOTE: Heaters are shipped available for natural gas, but can be converted to L.P. / Propane with Kit Model No. 1NP0418.

1MBH rating should be reduced at the rate of 4 percent for each 1,000 feet above 4,500 feet. 2Based on maximum input and 1075 Btu/Ft3.

3The air flow must be adjusted to obtain a temperature rise within the range shown.

COMBUSTION DISCHARGE (DCG Models)

The products of combustion are discharged horizontally through two screened (hooded) openings on the upper gas heat access panel.

FIG. 6 - EXTERNAL SUPPLY CONNECTION EXTERNAL SHUT-OFF

GAS PIPING (DCG Models)

Proper sizing of gas piping depends on the cubic feet per hour of gas flow required, specific gravity of the gas and the length of run. “National Fuel Gas Code” Z223.1 (in U.S.A.) or the current Gas Installation Codes CAN/CGA-B149.1 and .2 (in Canada) should be followed in all cases unless superseded by local codes or gas utility requirements. See Pipe Sizing table.

The heating value of the gas may differ with locality. The value should be checked with the local gas utility.

NOTE: There may be a local gas utility requirement specifying a minimum diameter for gas piping. All units require a 1 inch pipe connection at the entrance fitting.

TABLE 3 - PIPE SIZING

Length in Feet	Nominal Iron Pipe Size
	1 in.	1-1/4 in.
10	520	1,050
20	350	730
30	285	590
40	245	500
50	215	440
60	195	400
70	180	370
80	170	350
90	160	320
100	150	305

Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3 inch water column and 0.6 specific gravity gas).

GAS CONNECTION (DCG Models)

The gas supply line can be routed through the knockouts located on the front of the unit or through the opening provided in the unit’s base. Typical supply piping arrangements are shown in the Supply Connection figures. All pipe, fittings, etc. are field-supplied.

Two grommets are shipped in the blower compartment (in parts bag taped to the blower housing) of every unit with gas heat and should be used in the knockouts when the gas piping enters through the front of the unit.

After the gas supply piping has been installed, the bottom opening in the unit should be sealed to prevent water from leaking into the building.

Gas piping recommendations:

1.A drip leg and a ground joint union must be installed in the gas piping.

2.When required by local codes, a manual shut-off valve may have to be installed outside of the unit.

3.Use wrought iron or steel pipe for all gas lines. Pipe com- pound should be applied sparingly to male threads only.

6 Unitary Products Group