Installation; Component Location; Boiler And Circulator Sizing; Temperature & Pressure Relief Valve - Raypak RSIT30 Installation & Operating Instructions Manual

Installation

Component Location

For best results, the indirect water heater should be in
a central location close to the boiler. This will minimize
heat loss in the boiler piping and reduce wait times for
hot water at the point of use. The indirect water heater
must be protected from freezing temperatures.
Anode Rods
The use of anode rods is not required for this unit. The
all-stainless steel construction of this tanks minimizes
corrosion.

Boiler and Circulator Sizing

The ratings published in this manual for your Raypak
indirect water heater can be obtained through proper
selection of boiler output and circulator capacity. See
the performance data in Table C.
To determine the appropriate circulator for your system,
follow these three steps:
1. Calculate the pressure drop of all straight pipe and
fittings on the supply and return at the desired flow
rate.
2. Add the pressure drop from Step 1 to the pressure
drop through the indirect water heater coil (see
Table C for friction loss) to obtain a total pressure
drop.
3. Select a circulator pump that will provide adequate
flow at the total pressure drop. A pump performance
curve should accompany every circulator pump.
Temperature & Pressure Relief
Valve
This water heater requires a temperature and pressure
relief valve. The T&P relief valve is supplied by the in-
staller. This relief valve is required for safe operation of
the unit to protect from excessive temperatures and
pressures. A discharge pipe should be installed to the
relief valve. This discharge piping should terminate in a
safe location. This discharge piping must comply with
local and national plumbing codes. The piping must be
rated for 120ºF and 150 PSI.

Plumbing

A tempering valve may be required by local jurisdiction
to protect the user from scalding. Raypak recommends
the use of a tempering valve with this indirect water
heater. The tempering valve limits the water tempera-
ture at the point of use.
If local municipal codes require a backflow preventer,
an expansion tank will be required. The expansion tank
will prevent pressure build-up inside of the indirect water
heater and associated piping. The expansion tank must
be installed in the domestic water piping close to the
tank. No shutoff valve is allowed between the expansion
tank and the indirect water heater.
All water connections made to this heater should be
sealed with thread tape or pipe dope. It is important to
use two pipe wrenches when tightening connections to
this tank. One wrench should be used to support the
tank fitting from rotating; the other wrench will be used
to rotate and tighten the plumbing fitting. It is recom-
mended to use shutoff valves on this tank for servicing.
The shutoff valves should not isolate the relief valve or
expansion tank from the indirect water heater. The inlet
of the heater should be piped with a drain connection
for servicing the heater.
Several piping diagrams are shown below depicting var-
ious installation variations. Use these diagrams (Figs. 3
& 4) to help piping the indirect water heater.
This unit is not supplied with a separate drain fitting. It
is recomended that one be added to the inlet piping. Fig-
ure 2 depicts the drain valve installation.
Cold Water Supply
Fig. 2: Drain Valve Installation
8