York MILLENNIUM Y22, Installation Manual, Page: 19 / 140

102777-YIM-E-0206
Unitary Products Group 19
PIPING CONNECTIONS
The hot water pipping must enter the unit through the floor of
the heat section compartment. The access doors to the com-
partment are gasketed so the compartment can be sealed.
However, as added protection for water leakage into the
space, the piping access holes should be sealed with a heat
resistant mastic Figure 11 shows the location of the compart-
ment and piping connections.
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.
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.
In one row hot water coil systems DO NOT exceed
a 40 gallons per minute flow rate.
In two row hot water coil systems Do Not exceed a
80 gallons per minute flow rate
Condensate will freeze on the control valve and
piping if they are not properly insulated. Insulating
the control valve and piping is the responsibility of
the installing party.
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 tenets of the structure that is
being conditioned.
FIGURE 11 - HOT WATER PIPING CROSS-SEC-
TION
FIGURE 12 - STEAM PIPING CROSS-SECTION
H O T W A T E R
C O I L
C O N D E N S I N G
S E C T I O N
I N 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 I O N
C O M P A R T M E N T
( 1 O R 2 R O W )
O U T S I D E O F
B A S E R A I L
S T E A M
C O I L
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 "
I N L E T ( 2 " )
8 "
9 "
H E A T S E C T I O 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 I D E O F
B A S E R A I L