Water Piping - Raypak XTherm Series Installation & Operating Instructions Manual

mm per kW) of total rated input of the burner(s),
2
and the location of the opening(s) shall not inter-
fere with the intended purpose of the opening(s)
for ventilation air referred to in 1. This opening(s)
can be ducted to a point not more than 18 in. (450
mm) nor less than 6 in. (152 mm) above the floor
level. The duct can also "goose neck" through the
roof. The duct is preferred to be straight down 18
in. (450 mm) from the floor, but not near piping.
4. Refer to the B149 Installation Code for additional
information

Water Piping

General
The heater should be located so that any water leaks
will not cause damage to the adjacent area or struc-
tures.
CAUTION: This heater must be installed with a
Primary-Secondary piping arrangement for the
variable flow pumping system to function properly.
NOTE: Minimum pipe size for the heater inlet/outlet
connections is dependent on the equivalent length
of piping between the load loop and the heater loop,
the operating conditions and the size of the heater.
See Table F and Table G.
Relief Valve Piping
WARNING: Pressure relief valve discharge piping
must be piped near the floor and close to a drain to
eliminate the potential of severe burns. Do not pipe
to any area where freezing could occur. Refer to
local codes.
The pressure relief valve is shipped mounted on the
outlet adapter.
Temperature & Pressure Gauge
The temperature and pressure gauge is shipped
threaded onto the boiler outlet assembly.
Hydrostatic Test
Unlike many types of heaters, this heater does not
re-quire hydrostatic testing prior to being placed in
operation. The heat exchanger has already been
factory-tested and is rated for 160 psi operating pres-
sure. However, Raypak does recommend hydrostatic
testing of the piping connections to the heater and
the rest of the system prior to operation. This is par-
ticularly true for hydronic systems using expensive
glycol-based anti-freeze. Raypak recommends con-
ducting the hydrostatic test before connecting gas
piping or electrical supply.
Leaks must be repaired at once to prevent damage
to the heater. NEVER use petroleum-based stop-leak
compounds.
To perform hydrostatic test:
1. Connect fill water supply. With bleed valve open,
fill heater with water. When water flows from bleed
valve, shut off water. Close bleed valve. Carefully
fill the rest of the system, making sure to eliminate
any entrapped air by using high-point vents. Close
feed valve. Test at standard operating pressure for
at least 24 hours.
2. Make sure constant gauge pressure has been
maintained throughout test.
3. Check for leaks. Repair any that are found.
Flushing/Cleaning of System Piping
Many of the chemicals used to perform this function
will harm the heat exchanger as well as some of the
gaskets and seals within the unit, causing a non-war-
rantable failure. When required, Raypak recommends
the boiler be isolated from the system piping prior to
flushing or cleaning, using any cleaning agent.
System Sensor Installation
The System Sensor (S3) is required for all selectable
modes unless the units firing rate will be controlled by
an external source such as our Temp Tracker MOD+
Hybrid sequencer. Proper placement and method
of installation are critical for proper operation of the
system. The sensor must be installed in a drywell
in conjunction with heat conductive compound as
shown in the following images. The drywell must be
installed no more than 5 equivalent feet of pipe/tubing
downstream of the de-coupler and installed in such a
way that ensures the sensor bulb is in the flow path.
Raypak Integral Cold Water Protection
CAUTION: Be careful when installing the drywell not
to over-tighten the well as this can damage the well
and may prevent the sensor from fitting properly.
14