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Hot Water Heater Design
Coil freeze possible . Can damage equipment .
Follow instructions for mixing antifreeze solution. Some
products have higher freeze points in natural state than
when mixed with water. The freezing of coils is not the
responsibility of Daikin Applied.
If the 10th digit of the model number is a "W", the rooftop unit
was furnished with a factory installed hot water coil (Example:
DPS010AHCW). The hot water coil comes with a piping
vestibule for field supplied and installed control valve and
piping. The coil is furnished with ODM copper connections.
The Rebel commercial rooftop units are available with a low
heat (one row coil) or a high heat (two row coil) configuration (3
rows also offered on DPS 016–028).
Hot water coils are not recommended for use with entering
air temperatures less than 40°F (4°C). No control system can
guarantee a 100% safeguard against coil freeze up. Glycol
solutions or brines are the only freeze-safe media for operation
of water coils at low entering air temperatures.
See certified drawings for the recommended piping entrance
locations. Seal all piping penetrations to prevent air and water
leakage.
NOTE: Factory installed piping is copper. Dissimilar metal
within the plumbing system can cause galvanic
corrosion. To avoid corrosion, provide proper di-
electric fittings as well as appropriate water treatment.
Table 28: Heating Capacity and Water Pressure Drop – Hot Water Coils
Unit
3
4
5
6
7 .5
10
12
15
16
18
20
25
28
Nominal airflow, 60°EAT, approximately 180°–160° water. WPD does not include a field supplied valve pressure drop. 2-row performance shown, 1-row coil also available.
www.DaikinApplied.com
CAUTION
MBH
61 .4
72 .9
82 .6
91 .6
149 .7
176 .9
195 .9
221 .4
347
376
403
464
497
Figure 59: Hot Water Heating Schematic
Field Installed Freeze Stats
Field installed freeze stats can be added. The freeze stat
contacts should be wired to the MicroTech III digital input X5
as shown in . MicroTech III will turn the fans OFF, shut the
outdoor air damper, open the valve and issue an alarm when
the normally closed contact opens between terminals 111 and
112 .
Field Installed Freeze Stat Schematic
TB2
160A
MJ
111
Freezestat
GPM
6 .1
7 .3
8 .2
9 .2
15 .0
17 .8
19 .6
22 .1
35 .5
38 .4
41 .1
47 .3
50 .7
65
o
h
W
pTIonal
oT
TB2
160A
DI1
112
155A
(160)
/
120V_N
R1
WPD
Connection Size
1 .0
1.375 Sweat
1 .4
1.375 Sweat
1 .7
1.375 Sweat
2 .2
1.375 Sweat
3 .1
1.375 Sweat
4 .2
1.375 Sweat
5 .1
1.375 Sweat
6 .4
1.375 Sweat
0 .7
1.375 Sweat
1 .2
1.375 Sweat
1 .3
1.375 Sweat
1 .4
1.375 Sweat
1 .6
1.375 Sweat
IM 1125-7 • REBEL ROOFTOPS
h
aTer
eaT
o
h
W
h
pTIonal
oT
aTer
eaT
EXPD
X5-AO
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