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TABLE 3: TANKLESS HEATER DATA: Rear
Mounted Heater on Steam and Water
Boilers
Heater Rating
Boiler
Heater
Model
No.
Steam
V713
V1-2
---
V73
V1-2
2.75
V1-1
---
V714
V1-2
---
V74
V1-2
3
V75
V1-2
3.25
V76
V1-2
3.75
V77
V1-2
3.75
V78
V1-2
4
V79
V1-2
4
TABLE 3A: TANKLESS HEATER DATA: Front
Mounted Heater on Water Boilers
Boiler
Heater
Heater Rating
Model
No.
V73
222
V74
222
V75
222
V76
222
222
V77
A54
222
V78
A54
222
V79
A54
cold water with the hot. This prevents excessive
and possibly scalding hot water at the fixtures. In
addition, savings of hot water will be achieved
since the user will not waste as much hot water
while seeking water temperature to his liking.
Higher temperature hot water required by
dishwashers and automatic washers is possible by
piping the hot water from the heater prior to
entering the mixing valve. The mixing valve should
be "trapped" by installing it below the cold water
inlet to heater to prevent lime formation in the
valve.
Pressure Drop
thru Heater
(GPM)
(PSI)
Water
Steam
3.25
---
3
3.9
3.5
---
4
---
3.25
4.7
3.5
5.6
3.75
7.2
4
7.2
4.5
8
4.5
8
Pressure Drop
(GPM)
Thru Heater (PSI)
3
22
3.5
22
4
30.5
4.5
33
4.6
33
5.5
36
4.75
40
6
39.5
4.75
40
6
39.5
Install an automatic mixing valve at the tankless
heater outlet to avoid risk of burns or scalding
due to excessively hot water at the fixtures.
Adjust and maintain the mixing valve in
accordance with the manufacturer's instructions.
Water
3. FLUSHING OF HEATER — All water contains
5.6
some sediment which settles on the inside of the
4.7
coil. Consequently, the heater should be
periodically backwashed. This is accomplished by
4.4
installing hose bibs as illustrated and allowing
8
water at city pressure to run into hose bib A,
through the heater, and out hose bib B until the
5.6
discharge is clear. The tees in which the hose bibs
6.4
are located should be the same size as heater
connections to minimize pressure drop.
7.2
4. HARD WATER — A water analysis is necessary
8
to determine the hardness of your potable water.
9.8
This is applicable to some city water and
particularly to well water. An appropriate water
9.8
softener should be installed based on the analysis
and dealer's recommendation. This is not only
beneficial to the tankless heater but to piping and
fixtures plus the many other benefits derived from
soft water.
NOTE: STEAM BOILERS
a. During summertime operation, the normal water
G. INSTALL SMOKEPIPE — The V7 should be vented
into a fireclay tile-lined masonry chimney or chimney
constructed from type L vent or a factory built chimney
that complies with the type HT requirements of
UL103. The chimney and vent pipe shall have a
sufficient draft at all times, to assure safe proper
operation of the boiler. See Figure 13 for recommended
installation.
1. Install a draft regulator (supplied with boiler)
following the instructions furnished with the
regulator. See Figure 14 for alternate draft regulator
locations.
2. Consider the chimney overall. Chimneys that have
a high heat loss may become less suitable as the
heat loss of the home goes down and the efficiency
of the boiler installed goes up. Most homes have a
chimney appropriate for the fuel and the era in
which the home was built. That may have been a
coal fired or an inefficient oil fired boiler built into
a home without insulation or storm windows. With
increasing fuel prices that home probably has been
insulated and fitted with storm windows so that the
heat loss of the home has been reduced. This
15
WARNING
line should be raised 1", from 22-5/8" to
23-5/8" (see Figure 1C) for improved tankless
heater performance.
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