12
III: INSTALLATION INSTRUCTIONS (continued)
Figure 9: Schematic Tankless Heater Piping
supply line. The flow regulator also limits the flow of
supply water regardless of inlet pressure variations in
the range of 20 to 125 psi.
WARNING
Install automatic mixing valve at tankless heater
outlet to avoid risk of burns or scalding due to
excessively hot water at fixtures. Adjust and
maintain the mixing valve in accordance with the
manufacturer's instructions.
2. TEMPERING OF HOT WATER - Installation of an
automatic mixing valve will lengthen the delivery of
the available hot water by mixing some 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.
3
.
FLUSHING OF HEATER - All water contains some
sediment which settles on the inside of the coil.
Consequently, the heater should be periodically
backwashed. This is accomplished by installing hose
bibs as illustrated in Figure 9 and allowing water at
city pressure to run into hose bib A, through the heater,
and out hose bib B until the discharge is clear. The
tees in which the hose bibs are located should be the
same size as heater connections to minimize pressure
drop.
4.
HARD WATER - This applicable to some city water
and particularly to well water. This should not be a
deterrent but precautions are necessary. A water analysis
is necessary and an appropriate water softener installed.
This is not only beneficial to the heater but to piping
and fixtures plus the many other benefits derived from
soft water.
I.
CONNECT OIL LINES
- do not use compression fittings.
Use only flare fitting. Note that the pump supplied on the
V1 RO/FO is TWO-STAGE and is set up for TWO-PIPE
operation, see Figure 10. Refer to Table 3 for recommended
maximum lengths to be used.
Boiler Model Heater
No.
Heater Rating
(GPM)
Pressure Drop
Thru Heater (PSI)
V13A RO/FO
V1-2
3¼
5.6
V14A RO/FO
V1-2
4
8.0
Table 2: Tankless Heater Data
Figure 10: Two-Pipe Installation
Lift "L" (feet)
Length of Tubing* (feet)
Two-Stage Units
3/8" OD
1/2" OD
0
68
100
2
63
100
4
58
100
6
53
100
8
48
100
10
42
100
12
37
100
14
32
100
16
27
100
18
22
88
* Line lengths include
both
vertical and horizontal lengths.
Table 3: Two-Pipe Systems - Two Stage Pump
NOTE:
Tankless heater ratings in the V1 RO/FO oil boilers
are based on intermittent draw, temperature rise of 100°F (40-
140°F) and boiler water temperature of 200°F.
