Raypak 185A Replacement Instructions Manual page 8

REMOVING & REPLACING SENSOR
Make sure the power and gas are off.
1. Loosen drain plug to relieve pressure in heat
exchanger. See Fig. 14.
2. Remove five screws and access panel as
shown in Fig. 15.
3. Route the new 3-wire sensor connector to
the board following the existing red sensor
wires.
4. Unscrew compression nut and loosen com-
pression fitting of the old sensor. Remove
the old sensor. See Fig. 16.
5. Install new sensor into the header and
tighten the compression fitting and com-
pression nut.
6. Plug the 3-wire sensor connector into P1, as
shown in Fig. 17 and Fig. 18.
NEW 3-WIRE
SENSOR
LOCATION P1
Fig. 17
Page 8
LOOSEN DRAIN
PLUG TO
RELIEVE
PRESSURE
Fig. 15
UNSCREW
COMPRESSION
NUT
LOOSEN
COMPRESSION
FITTING
P1
241169
P/N
Effective: 10-01-10
Replaces: 09-05-08
Fig. 14
REMOVE THESE 5
MOUNTING SCREWS
Fig. 18
Rev 4
Fig. 16