Heat Exchanger Reversal - Rheem Raypak R207A Installation And Operation Manual

The heater requires water flow and positive pressure to
fire and operate properly. It must therefore be installed
downstream of the discharge side of the filter pump. See.
Figure 27 and Figure 28.
A typical installation is plumbed as follows:
1. The inlet side of the filter is plumbed directly to the
discharge side of the filter pump;
2. The outlet side of the filter is then plumbed to the inlet
of the heater; and
3. The outlet of the heater is plumbed to the return line
to the pool or spa. The pump, filter and heater are
thus plumbed in series (Salt generators and chemical
feeders must be down stream of the pool heater).
Plumbing from the heater back to the pool or spa must not
have any valves or restriction that could prevent flow when
the pump is operating.
CAUTION: An additional source of heated water,
A
e.g. a solar system, must be connected to the main line
ahead of the heater inlet pipe in order for it to act as
the primary heat source. If the primary system provides
adequate heat to maintain set-point, the heater will not
fire. Be advised that the control panel will then display
sensed water temperatures downstream of the primary
heating system, rather than the temperature of the water
exiting the pool.
Heater must be located so that any water leaks will not
damage the structure of adjacent area. PVC pipe may be
glued directly into the headers unions.

Heat Exchanger Reversal

Procedure for Residential Models
1. Remove right and left side access panels. See
Figure 29.
Figure 29. Access Panels
2. Disconnect wires at high limit, AGS (automatic gas
shut-off), water pressure switch on the in/out header,
and ProTek Shield bonding wire. See Figure 30.
20
Figure 30. Component Wiring Locations – In/Out Header
3. Remove the thermostat temperature sensor by
loosening the compression fitting nut. Re-route the
sensor to left side of the heater. See Figure 31.
Figure 31. Thermostat Temperature Sensor Location
4. Remove (12) nuts holding the inlet/outlet and return
headers to the tube sheets. Clean off tube sheet area
where the gasket seats. Also clean off the header and
the gasket. Apply a non-petroleum-based lubricant to
the gasket such as Aqualube. Re-attach the headers
to the opposite sides, making sure they are installed
in an upright position. Do not over-tighten. Torque
should not exceed 7 ft/lb. See Figure 30.
5. Reconnect high limit, AGS, water pressure switch
wires, and ProTek Shield bonding wire.
6. Insert the temperature sensor into the compression
fitting, so that the sensor is flush with the top of the
fitting. Tighten 1/2 turn past hand tight.
7. Allow for water flow through the heater and check for
leaks.
F10652
8. Re-attach access panels to the opposite sides.
For instructions on reversing the heat exchanger
connections on ASME models, call your factory
representative.
F10653
F10654