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882108-YIM-B-1012
Johnson Controls Unitary Products 19
STEAM HEAT
The YORK Millennium units (25, 30 and 40 Ton sizes) can be
furnished with a YORK single row steam coil. YORK steam
coils are a factory installed option.
NOTE: The steam control valve, power and control wiring to
the actuator of the valve is the responsibility of the
installing party.
PIPING CONNECTIONS
Refer to Tables 46 through 49 and Figures 41 and 42 for flow
rate and capacity.
The steam piping must enter the unit through the floor of the
heat section compartment. The access doors to the compart-
ment are gasketed so 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 location of
the compartment and piping connections.
DO NOT use tin based solder. Brazing with tin
based solder could cause equipment damage or
possible injury to tenants of the structure that is
being conditioned.
FIGURE 9 - HOT WATER PIPING CROSS-SEC-
TION
FIGURE 10 - STEAM PIPING CROSS-SECTION
H O T W A T E R
C O IL
C O N D E N S IN G
S E C T IO N
IN L E T (2 " )
O U T L E T (2 " )
C
L
2 .5 5 "
8 .3 8 "
2 .2 5 "
1 1 .8 8 "
2 6 "
1 5 .8 "
8 8 .7 5 "
H E A T S E C T IO N
C O M P A R T M E N T
( 1 O R 2 R O W )
O U T S ID E O F
B A S E R A IL
S T E A M
C O IL
C O N D E N S I N G
S E C T I O N
O U T L E T ( 1 1 /2 " )
C
L
2 .5 5 "
8 .3 8 "
2 6 "
1 5 .8 "
IN L E T (2 " )
8 "
9 "
H E A T S E C T IO N
C O M P A R T M E N T
8 8 .7 5 "
T O P V I E W
O U T S ID E O F
B A S E R A IL
All piping and control valves, and wiring that is
field installed must be properly insulated and con-
form to all local and national codes.
There are no provisions in the coil or control
sequence to prevent freezing of condensate. The
control valve, piping and field installed wiring con-
nections are particularly vulnerable because they
are installed in the vestibule outside of the condi-
tioned air stream. The installing party will be
responsible for properly insulating and installing
power and control wiring, to the actuator and pip-
ing.
DO NOT use steam coils as hot water coils under
any circumstances.
In steam coil systems, the steam pressure shall
not exceed 15 PSI.
Piping access holes should be sealed with a heat
resistant mastic to prevent damage to equipment.
DO NOT use tin based solder. Brazing with tin
based solder could cause equipment damage or
possible injury to tenants of the structure that is
being conditioned.