Burnham K50 manual Installation of Pilot Safety Switch EOP Control System

Fig. 35

INSTALLATION OF PILOT SAFETY SWITCH

EOP CONTROL SYSTEM

Install AT72D Transformer on J-box.

Wire L62G13-3C Pilot Safety Switch to the 24V/40VA transformer and to the V88A Gas Valves using the 105ºC wire furnished, see Fig. 51 or 52. Run these wires to outside of jacket on underside of manifold and secure in this position with Wire Ties furnished to provide strain relief. Provide adequate support and strain relief for wiring outside jacket.

2.INSTALLATION OF PILOT PIPING – Attach the bracket for mounting of the J-box to the lower front corner of the Upper Jacket End Panel using two #10-32

x ½” MS and nuts. Mount junction box to bracket using #8 SMS. Install RV-12LT Regulator, (Packed in Gas Train Carton) and 1/8” tee in the ¼”

OD pilot tubing as shown in Fig. 36. Install 24V/40VA Transformer on J-box.

3.INSTALLATION OF PILOT SAFETY SWITCH AND

PILOT PIPING – Using two #10-32 x 2” MS and nuts, install the L62GB-3C pilot safety switch bracket on the manifold just to the right of the main burner with pilot. Install L62GB-3C pilot safety switch on bracket using two #10-32 x ½” MS. “IN” on pilot safety switch should be pointed in the direction of the Gas Train to which the pilot safety switch is to be connected, see Fig. 35.

Using ¼” OD aluminum tubing, connect the pilot shutoff valve installed in the manual shutoff valve in the gas train, to the inlet of the RV-12LT regulator (packed in Gas Train Carton). Regulator should be above Gas Train and near front of boiler, see Fig. 36.

Install 3/8” tee into outlet of regulator (USA boilers) and, using ¼” OD aluminum tubing, connect outlet of tee to “IN” connection on pilot safety switch, see Fig.

36.

Using ¼” OD aluminum tubing, connect the outlet of the pilot safety switch to the tubing or fitting connected to the pilot burner, see Fig. 36.

Connect Q309 thermocouple to pilot safety switch.

a.Completion of Wiring -

Connect power supply fused disconnect switch service switch, primary and secondary of Gas Valve Transformer, gas valves, and other controls – see Fig. 51 or 52 for wiring type and connections to be

Note - Pilot Piping duplicated on 15 sect. and larger boilers.

38

Fig. 36

PILOT PIPING

EOP CONTROL SYSTEM