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3.9.7.
Domestic Hot Water
NOTE: Soft = 3–4 grains per gallon; Medium = 5–15 grains
per gallon; Hard = 16–25 grains per gallon.
WH – Direct DHW Configuration
When the unit is ordered as a "WH" configuration, the
only application available to it is direct DHW with single
or multiple heaters (Maximum 4 heaters). See Figure 20.
The tank temperature is controlled by the System sensor
(S3). The integral Boiler Pumps (P1) run during any call for
heat. The System Pump (P2) output is active whenever the
system is enabled. The Boiler / Injector Pumps are delayed
"off" after the Tank Target temperature is achieved and as
user-defined in the BOILER menu.
NOTE: If local codes require a vacuum relief valve,
acquire one locally and install per valve manufacturer's
instructions.
NOTE: WH units will operate to a maximum setpoint
of 150°F (66°C). For temperatures required above
150°F (66°C), an "H" model boiler configured for high-
temperature potable operation must be used and great
care must be given to ensure water hardness is no more
than 15 grains per gallon for scale-free operation. MODE
1 should be used and configured for setpoint operation
for process heating applications.
For DWH pipe sizing, see Table G and Table K.
Model 1005A
Tank/
Return
Soft/Med
Hard Sup.
Temp
Sup. Temp
Temp
1
(°F / °C)
(°F / °C)***
(°F / °C)*
60 (15)
138 (59)
135
80 (27)
138 (59)
135
100 (38)
138 (59)
135
120 (49)
146 (63)
146 (63)
130 (54)
156 (69)
156 (69)
140 (60
166 (74)
166 (74)
1 Approximate high fire heater outlet temperature based on the standard heater pump and the recommended connecting pipe size.
2 Minimum pipe size based on total equivalent feet of supply and return piping between the tank and heater.
WH-1005A - 87 gpm @ 3.5 ft (329 lpm @ 1 m) hd pressure drop
WH-1505A - 113 gpm @ 7.6 ft (428 lpm @ 2.3 m) hd pressure drop)
WH-2005A - 116 gpm @ 8 ft (439 lpm @ 2.4 m) hd pressure drop)
Table K.
Hot Water Supply Temperatures and Minimum Pipe Size at Varying Return Temperatures
*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 130°F (54°C).
For higher than 130°F (54°C) 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.
18
Minimum Tubing Size
2
1
<80' equiv. 80-200' equiv.
2"
2-1/2"
2"
2-1/2"
2-1/2"
3"
2-1/2"
3"
2-1/2"
3"
2-1/2"
3"
3.9.8.
Potable Water and Space Heating
CAUTION: When this heater is used for both potable
A
water and space heating, observe the following to ensure
proper operation.
1. All piping materials and components connected to
the water heater for the space heating application
shall be suitable for use with potable water.
2. Toxic chemicals, such as used for boiler treatment,
shall not be introduced into the potable water used
for space heating.
3. If the heater will be used to supply potable water,
it shall not be connected to any heating system or
components previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating
at temperatures higher than 140°F (60°C), a means
such as a mixing valve shall be installed to temper
the water in order to reduce scald hazard potential.
Model 1505A
Minimum Tubing Size
Med Sup.
Hard Sup.
Temp
Temp
1
1
<80'
(°F / °C)
(°F / °C)*
equiv.
145 (63)
143 (62)
2"
145 (63)
143 (62)
2"
145 (63)
143 (62)
2-1/2"
146 (63)
146 (63)
2-1/2"
156 (69)
156 (69)
2-1/2"
166 (74)
166 (74)
2-1/2"
Model 2005A
Minimum Tubing
Soft/Med
2
Sup. Temp
1
<80'
80-200' equiv.
(°F / °C)***
equiv.
2-1/2"
154 (68)
2-1/2"
154 (68)
2-1/2"
3"
154 (68)
2-1/2"
3"
155 (68)
2-1/2"
3"
165 (74)
2-1/2"
3"
175 (79)
2-1/2"
Size
2
80-200'
equiv.
2"
2-1/2"
3"
3"
3"
3"
3"
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