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Hot Water Heater Design
CAUTION
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.
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
Table 28: Heating Capacity and Water Pressure Drop – Hot Water Coils
Unit
MBH
GPM
WPD
Connection Size
3
61 .4
6 .1
1 .0
1.375 Sweat
4
72 .9
7 .3
1 .4
1.375 Sweat
5
82 .6
8 .2
1 .7
1.375 Sweat
6
91 .6
9 .2
2 .2
1.375 Sweat
7 .5
149 .7
15 .0
3 .1
1.375 Sweat
10
176 .9
17 .8
4 .2
1.375 Sweat
12
195 .9
19 .6
5 .1
1.375 Sweat
15
221 .4
22 .1
6 .4
1.375 Sweat
16
347
35 .5
0 .7
1.375 Sweat
18
376
38 .4
1 .2
1.375 Sweat
20
403
41 .1
1 .3
1.375 Sweat
25
464
47 .3
1 .4
1.375 Sweat
28
497
50 .7
1 .6
1.375 Sweat
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.
Freezestat
EXPD
X5-AO
MJ
TB2
112
DI1
160A
160A
TB2
111
R1
155A
120V_N
/
(160)
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65
IM 1125-7 • REBEL ROOFTOPS
Summary of Contents for Rebel DPS003A
Page 109: ...IM 1125 7 109 Addendum follows...
