Electrical Wiring; Millivolt Models ("M" Suffix); Digital Models ("E" Suffix) - Raypak 266 Installation And Operation Manual

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 33.
Figure 33. Component Wiring Locations - In/out Header
3. Digital Models: Remove the thermostat temperature
sensor by loosening the compression fitting nut. Re-
route the sensor to left side of the heater. See Figure 34.
Millivolt Models: Remove the temperature sensor
bulb and retainer clip by loosening the compression
fitting nut. Re-route the sensor bulb to the left side of
the heater. See Figure 35.
Figure 34. Digital Temperature Sensor Location
Figure 35. Millivolt 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 34.
22
5. Reconnect high limit, AGS, water pressure switch
wires, and ProTek Shield bonding wire.
6. Digital Models: 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.
Millivolt Models: Insert sensor bulb and retainer clip
into sensor well.
7. Allow for water flow through the heater and check for
leaks.
8. Re-attach access panels to the opposite sides.
For instructions on reversing the heat exchanger
connections on ASME models, call your factory
F10653
representative.

5. ELECTRICAL WIRING

NOTE: If it is necessary to replace any of the original
wiring, use 105°C wire or its equivalent, and/or 150°C
wire or its equivalent, like the original wiring.
A WARNING: Digital heaters are factory-wired for
240 VAC, 1 Ph, 60 Hz power supply. DO NOT attempt to
operate at 208 VAC.

Millivolt Models ("M" suffix)

The Millivolt models are equipped with a self-generating
electrical system in which the electrical current is provided
by a pilot generator. No external electrical connections are
required.
When installing a remote switch, do not exceed 10 ft (3 m)
of wiring from the heater. Use 18-gauge stranded wire.
F10654

Digital Models ("E" suffix)

The standard field-wiring connection is on the right side of
the heater.
To wire the heater from the left side, follow these steps:
1. Remove the two (2) screws that hold the front door
to the heater. Remove and set aside door for better
access to wiring.
2. Remove the four (4) screws that hold down the
junction box to the sway brace.
3. Remove the transformer cover located on the far
F10667
right by removing one (1) screw.
4. Remove the two (2) screws that hold down the
transformer.
5. Remove the one (1) screw that holds down the
ground wires.
6. Disconnect P6 connector from PC board.
7. Remove transformer from its current location and
relocate it on the far left side of the heater.