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SAFETY SEQUENCES DURING OPERATION
IN0UO_ TENPm_IURE _ SWITCH
IF DRAFT _ND_J_ TE_L°E_A1UREREJ_O_ES [
_'nJl_ SAFETYS_ITCH s_0m'r,
I
a.o_,lG c._ VAI.VE. (UO4T _; OUT)
4,
• J,
WHEN _PE_ATURE SAFETYSWIi"C_
UG_T-OFF SI_G_JENC_
LOSS OF FLN'IE SIGNAL.
[ iF"AN r_TASUSHED FLA_E .Sl_ is LOST
WH(IJ_CONTROLE_I_CTS I_AT IHE BURNER
J lS OP_A'nNG, CON'[_O., MU. IMM_'OIA_Y
| OE-E_ERCtZE GAS VALVE,VALVEL.'_HTOOF.SOUt
4'
CONTROLWLL ATTEMPTTO RE-L_;_T 8OILF.R
3 T_S. F e_ua_ _s NOT PROV_, CO_'r_OL
LOC_O_JT - PRO_I.E_ ESTAB_NG A
F!.JU&F'NGNAL, VkLVEU_h'T_III_MI_NO.
LOSS OF COHBUSTION A_RFLOW
]F COMBUST10_ ,_RFt_OW IS LOST WHILE BURNER
IS F_R/NG(oIF'FF-RENTIA_A_RPRESSURI_
J SV_TCHCONTACTSOF_N) GAS VAt.'A_WIU.
J B/_O_-ENERG_Z£D,VALVEIJOKrG_OUT.
I
4'
4'
4'
l IF AIR FLOW DO_S NOT R_-E_STABtJSH /
coNTROL LOCKOUT- PRO_IE_ 't,ITH
J
CC_BUS'nON AIRF_OW,PU1_O_LI_'_ BUeIK_.
_e_ T_mA'rURe SAFETYswrrc_
IF BURNI_ROPERA_ _g_l BOa.EXHAS NO
WAll_, _M BOU_R s_c'n_ j
_'r u,,_,,oLy. !
4'
TO IOC. POY_ _'_O_CATORliGHT G<_S OUr. J
_u_s u_u_ _ ToR_-O.O_
CO_TXCTS._O',_ u_n'oo_ ou'r.
HI LIMIT CONTROL
F BOilER WAT_ "_3,4PE_A'i_ REACPIF.._
HI UMIT (AQ_JA._A_ S_NT, HI UMIT
N.C. CONTACTSOF_ IMM_D_A'i_LY.
CLOSINGGAS VAL_,_.VAL'_ELIGHT_U'r,
5_CONOPOST P_JRQ_AND SWITCHOFF,
J,
4'
, ,,,,
CIRCULATOR PUMP
I
'V'
R_COVERYFROM ANY LOCKOUTREQUIRESRESET
V_tCH IS ACCOMPL_SHE_BY R_40_NG ANO
RF.J,,PP_YiNG'n-it TH_dOSTAT CALLFORHEAT
o_ _ TOCONTROL
48
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