Start Up; Purging The System; Flushing The System; Checking Circulator - Raypak RSIT30 Installation & Operating Instructions Manual

START UP

Relief Valve
A new combination temperature and pressure (T&P) re-
lief valve, complying with the Standard for Relief Valves
and Automatic Gas Shut-Off Devices for Hot Water Sup-
ply Systems, ANSI Z21.22, is supplied by the installer.
It must be installed in the opening provided and marked
for the purpose on the water heater. No valve of any
type should be installed between the relief valve and the
tank. Local codes shall govern the installation of relief
valves.
The pressure rating of the relief valve must not exceed
150 PSI, or the maximum working pressure of the water
heater as marked on the rating plate.
The BTUH rating of the relief valve must equal or ex-
ceed the BTUH input of the water heater as marked on
its rating plate.
Position the outlet of the relief valve above a suitable
open drain to eliminate potential water damage. Piping
used must be of a type approved for hot water distribu-
tion.
The discharge line must be no smaller than the outlet
of the valve and must pitch downward from the valve to
allow complete gravity drainage of the relief valve and
discharge line.
The end of the discharge line should not be threaded or
concealed, and must be protected from freezing. No
valve of any type, restriction, or reducer coupling may
be installed in the discharge line.

Purging the System

Purge the system of air and check for leaks at all of the
connections.

Flushing the System

Flush the system completely. It is important to clear any
debris and residues from inside the piping and tank be-
fore the water heater will be put to use by the customer.
To flush the system, open one of the hot water valves
at the point of use after the water heater. Allow enough
water to flow through the tank to change the water vol-
ume at least two times.

Checking Circulator

Check that the circulator or zone valve operates when
there is a call for heat. When a call for heat is initiated,
water should begin to flow through the indirect water
heater's coil.
Set the Thermostat to the
Desired Temperature
For normal water heating installations, Raypak recom-
mends an operating temperature of 120ºF or 49ºC.
Other temperatures may be required by the particular
installation. To minimize burns and scalding, Raypak
recommends that the water temperature be verified at
the point of use (see Verify the Water Temperature
below).
For VERSA-equipped Raypak boilers, the indirect water
heater's setpoint is controlled by the boiler and the
10k Ohm thermistor installed in the water heater's ther-
mal well. To adjust the water heater setpoint, please
refer to the equipped boiler, read the VERSA IC Instal-
lation & Operating Manual, Cat. 5000.72.
For installations with an aquastat control, the tempera-
ture is adjusted at the aquastat control located on the
tank thermowell. To adjust the setpoint temp, rotate the
dial on the aquastat to the desired setpoint.

Verify the Boiler Functionality

When a call for heat is initiated, the boiler should come
on and begin heating. The boiler should also shut off
when the tank has reached its setpoint. If the boiler does
not heat, please check that water circulator is function-
ing and that the wiring is correct.
Verify the Water Temperature
Raypak recommends that the water temp be verified at
the point of use. First, let the indirect water heater come
to temperature. The water heater has reached its set-
point when the boiler heating water has stopped flowing
through the heat exchanger. To verify the water temp,
open the shutoff valve at the point of use. Let the water
run for several minutes until the temperature has stabi-
lized. Measure this stabilized water temperature.
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