York Y34, Y33, Y32 manual Steam Heating, Physical Data Steam Coil 1 ROW, Steam Coil 1 ROW, 40 TON

246653-YTG-E-0108

STEAM HEATING

The YORK Millennium units (25, 30, and 40 ton sizes) can be manufactured with a steam heat coil (Bottom Supply only). YORK's one row steam coil is installed in the heating section just downstream of the supply air fan and just above the sup- ply air opening in the bottom of the unit.

The steam control valve will not be provided. The installer will need to field supply a steam control valve. Connect the steam piping and valve power wiring at the job site for the steam heat section to be operational.

There are no provisions in the coil or control sequence to pre- vent freezing of condensate. The control valve, piping and field installed wiring connections are particularly vulnerable because they are installed in the vestibule outside of the con- ditioned air stream.

All piping, control valves, and wiring that is field installed must conform to all local and national codes

Condensate can freeze on the control valve and piping if they are not properly insulated.

PHYSICAL DATA STEAM COIL - 1 ROW

Coil Casing . . . . . . . . . . . . . . . . . . . . Galvanized Steel Coil Construction . . . . . . . . . . . . . . . Al Fin / Cu. Tube Rows Deep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Fin Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . ..010” Tube Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..035” Tubes / Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Fins Per Inch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Tubes High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21” Tube Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65” Face Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.48 ft.2 Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 lbs.

*Hot water, steam coil or electric heat not available for front or rear supply.

TABLE 22: STEAM COIL (1 ROW, 40 TON)

CFM	CAPACITY (MBH) AT STEAM PRESSURE (PSI)
	2	6	10	15
8000	221.1	236.9	250.4	265.0
11000	252.9	271.0	286.4	303.1
14000	278.2	298.0	315.0	333.4
17000	299.4	320.7	339.0	358.8
20000	317.6	340.2	359.6	380.6

TABLE 23: STATIC RESISTANCE STEAM COIL (1 ROW, 40 TON)

CFM	8000	11000	14000	17000	20000
AIR PRESSURE DROP	0.18	0.31	0.48	0.67	0.88

PIPING CONNECTIONS

The steam piping must enter the unit through the floor of the heat section compartment. The access doors to the compart- ment are gasketed to the compartment can be sealed. How- ever, as added protection for condensate leakage into the space, the piping access holes should be sealed with a heat resistant mastic. The following figure illustrates the approxi- mate location of the compartment and piping connections.

TOPVIEW

	STEAM	CONDENSING
	COIL	SECTION
	26"
		OUTLET(11/2")
15.8"	INLET(2")	OUTSIDEOF
		BASERAIL
	8"
		8.38"
		2.55"
	9"	88.75"
HEATSECTION
COMPARTMENT	C
	L

TABLE 20: STEAM COIL (1 ROW, 25 & 30 TON)1

CFM	CAPACITY (MBH) AT STEAM PRESSURE (PSI)
	2	6	10	15
6000	194.1	207.9	219.8	232.6
8000	221.1	236.9	250.4	265.0
10000	243.2	260.5	275.4	291.4
12000	261.9	280.6	296.6	313.9
15000	285.6	306.0	323.5	342.4

1.Based on 60°F entering air temperature, 2.00” maximum air pressure drop across the coil.

TABLE 21: STATIC RESISTANCE STEAM COIL (1 ROW, 25 & 30 TON)

CFM	6000	8000	10000	12000	15000
AIR PRESSURE DROP	0.11	0.18	0.26	0.36	0.54

FIGURE 18 - STEAM PIPING CROSS SECTION

DO NOT use tin based solder. Brazing with tin based solder could cause equipment damage or possible injury to OCCUPANTS of the structure that is being conditioned.

Johnson Controls Unitary Products 25