246653-YTG-E-0108
14
Johnson Controls Unitary Products
HOT WATER HEATING
1
The YORK Millennium Rooftop units (30 - 40 Ton sizes) can
be furnished with a YORK hot water coil as the source of heat
(Bottom Supply Only). A one or two row coil will be factory
installed in the heating section downstream of the supply air
fan and just above the supply air opening in the bottom of the
unit.
The hot water control valve will not be provided. The installer
will need to field supply a water valve. The installer must also
connect the hot water piping, and valve wiring at the job site
for the hot water heat section to be operational.
For all hot water coils the entering water temperature should
not exceed 200°F.
PHYSICAL DATA HOT WATER COIL - 1 ROW
Coil Casing . . . . . . . . . . . . . . . . . . . . Galvanized Steel
Coil Construction. . . . . . . . . . . . . . . . Al Fin / Cu. Tube
Rows Deep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Fin Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . .006”
Tube Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .016”
Tubes / Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Fins Per Inch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Tubes High . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.50”
Tube Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65”
Face Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.16ft.
2
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71lbs.
Operating Weight . . . . . . . . . . . . . . . . . . . . . . . .83lbs.
NOTE:
Water pressure drop numbers are based on 60°F
entering air temperature, 2.00” maximum air pres-
sure drop across the hot water coil(s). ARI certified
ratings at covering other conditions are available
upon request. Hot water coils are approved for use
with glycol (rates available upon request).
PIPING CONNECTIONS
The hot water piping 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 (see the following illustration for approximate
location of the compartment and piping connections.
1. Hot water, steam or electric heat is not available for
front or rear supply.
TABLE 9: WATER PRESSURE DROP (1 ROW, 25 &
30 TON)
GPM
10
20
30
40
W
ATER
P
RESSURE
D
ROP
0.9
3.0
6.0
10.0
TABLE 10: STATIC RESISTANCE HOT WATER COIL
(25 & 30 TON)
CFM 6000
8000
10000
15000
A
IR
P
RESSURE
D
ROP
1 R
OW
0.07
0.11
0.16
0.32
A
IR
P
RESSURE
D
ROP
2 R
OW
0.14
0.23
0.33
0.65
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.
TABLE 11: HOT WATER COIL (1 ROW, 25 & 30
TON)
1
1.
Based on 60°F entering air temperature, 2.00” maximum pres-
sure drop across the hot water coil.
GPM
CFM
C
APACITY
(MBH)
AT
E
NTERING
W
ATER
T
EMPERATURE
140 °F
160 °F
180 °F
200 °F
10
6000
91.4
115.3
139.3
163.6
8000
102
128.8
155.8
182.9
10000
110.4
139.5
168.8
198.4
12000
117.3
148.4
179.6
211.2
15000
125.9
159.2
192.9
226.9
20
6000
103
129.4
156
182.7
8000
116.8
147
177.2
207.7
10000
128.2
161.3
194.7
228.2
12000
137.8
173.6
209.5
245.6
15000
150
189
228.2
267.8
30
6000
107.6
135
162.5
190.1
8000
122.8
154.3
185.8
217.5
10000
135.5
170.3
205.1
240.2
12000
146.4
184
221.8
259.7
15000
160.3
201.6
243
284.8
40
6000
110.1
138
166
194.1
8000
126.1
158.2
190.5
222.8
10000
139.6
175.2
210.9
246.8
12000
151.2
189.8
228.5
267.5
15000
166.1
208.6
251.3
294.1
