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11
REMOVING & REPLACING SENSOR - MODELS
185, 265, 335 & 405, A & B SERIES:
Make sure the power and gas are off.
1. Loosen drain plug to relieve pressure in heat
exchanger. See
Fig. 27
.
2. Remove five screws and in/out access panel
as shown in
Fig. 28
.
3. Re-route the 2-wire sensor connector from
the board (P1) back towards the in/out header.
4. Unscrew compression nut and loosen
compression fitting to replace old sensor
with new sensor. See
Fig. 29
.
5. Install new sensor and tighten compression
fitting and compression nut.
6. Re-route the new 3-wire sensor connector back
to the board.
7. Plug the 3-wire sensor connector to its correct location,
P1, shown in
Fig. 30
and close up in
Fig. 31
.
REMOVE THESE 5
MOUNTING SCREWS
Fig. 27
LOOSEN DRAIN
PLUG TO
RELIEVE
PRESSURE
Fig. 29
UNSCREW
COMPRESSION
NUT
Fig. 30
NEW 3-WIRE
SENSOR
LOCATION
LOOSEN
COMPRESSION
FITTING
2151 Eastman Ave., Oxnard, CA 93030 805-278-5300 Fax 800-777-7026
www.raypak.com
Technical support is available M-F, 5:30 AM to 5:00 PM PST, at 800-947-2975 or 800-627-2975
Fig. 28
Fig. 31
P/N 241169 Rev.-3
