Domestic Hot Water - Raypak XTherm Series Installation & Operating Instructions Manual

the Indirect Supply sensor (S6) and the Target Max
setting when using the Indirect DHW sensor (S5). The
Boiler/Injection Pump (P1) runs during all heat calls
regardless of priority. The Indirect DHW Pump (P3)
runs during an indirect call for heat with no "off" delay.
The Boiler/Injection Pump (P1) is delayed "off" as user
defined in the BOILER menu and the System Pump
(P2) is delayed "off" in the ADJUST menu. The system
pump (P2) runs whenever the system is enabled for
heating and the outdoor air temperature is lower than
the WWSD temperature setting (if utilized) unless an
indirect call for heat is present.
NOTE: A Tank Aquastat can be used in lieu of the
Indirect DHW Sensor (S5). See the VERSA IC man-
ual for additional details.

Domestic Hot Water

When designing the water piping system for domes-
tic hot water applications, water hardness should be
con-sidered. Table H indicates the suggested flow
rates for soft, medium and hard water. Water hardness
is ex-pressed in grains per gallon.
Soft (2-4) Med (5-15)
Sys Ret
Supply Sys Supply
Temp
Temp Flow Temp
(F)
(F) GPM (F)
80 144 74 139
100 144 108 139
120 149 164 149
140 169 164 169
Soft (2-4) Med (5-15)
Sys Ret
Supply Sys Supply
Temp
Temp Flow Temp
(F)
(F) GPM (F)
80 148 98 143
100 148 139 143
120 150 222 150
140 170 222 170
HIGH FIRE CONDITIONS
Flow rates determined based on max temperature rise of 30ºF. Pipe size selected based on 7.5 ft per sec maximum velocity.
*Must utilize optional cupro-nickel tubes. If over 25 grains per gallon, a water softener/treatment system must be utilized.
**Caution: For scale-free operation with "Hard Water" (16-25 grains per gallon of total hardness), the operating control must NOT be set
higher than 130ºF. For higher than 130ºF operation, a water softener/treatment system must be utilized.
***Care should be given to prevent over-softening of the water as over-softened water can become aggressive. Cupro-nickel tubes are
recommended for water softened below 5 grains per gallon.
Model 2505
Hard (16-25)
Pipe max eq ft
(164gpm@6.8ft.hd.)
Sys Supply Sys
Flow Temp Flow
3"
GPM (F) GPM
81 137 83 100
122 137 128 100
164 149 164 100
164 169 164 100
Model 3505
Hard (16-25)
Pipe max eq ft
(222gpm@2.7ft.hd.)
Sys Supply Sys
Flow Temp Flow
3"
GPM (F) GPM
106 143 106
155 143 155
222 150 222
222 170 222
Table H: Domestic Water Heater Flow Rate Requirements
Fig. 21: WH Units - Single Water Heater with Tank
H Units - Single Boiler with Process Tank
WH – Direct DHW Configuration
When the unit is ordered as a "WH" configuration, the
only application available to it is direct DHW with sin-
gle or multiple heaters (Maximum 4 heaters). The tank
temperature is controlled by the System sensor (S3).
The Boiler/Injection Pump (P1) runs during any call for
heat. The System Pump (P2) output is active whenev-
er the system is enabled. The Boiler Pump is delayed
"off" as user-defined in the BOILER menu.
Soft (2-4) Med (5-15)
Supply Sys Supply
Temp Flow Temp
4"
(F) GPM (F)
350 148 84 139
350 148 119 139
350 150 190 150
350 170 190 170
Soft (2-4) Med (5-15)
Supply Sys Supply
Temp Flow Temp
4"
(F) GPM (F)
100 148 112 146
100 148 158 146
100 150 253 150
100 170 253 170
19
Model 3005
Hard (16-25)
Pipe max eq ft
(190gpm@2.1ft.hd.)
Sys Supply Sys
Flow Temp Flow
3"
GPM (F) GPM
97 139 97
146 139 146
190 150 190
190 170 190
Model 4005
Hard (16-25)
Pipe max eq ft
(253gpm@3.5ft.hd.)
Sys Supply Sys
Flow Temp Flow
3"
GPM (F) GPM
115 146 115
165 146 165
253 150 253
253 170 253
4"
110
110
110
110
4"
100
100
100
100