Weather-Rite TT Series, Инструкция по установке, эксплуатации и обслуживанию

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TT-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
182 of 198
27. 8 .6 Switchin g to the Next Pro g rammed Process:
Table 50: MP2 and MP2+ Field Service Guide
Timed
Processes Nothing is req u ired. The MP2+ system w ill immediately proceed to the next programmed
process after timing o u t.
NOTE: If the last Process of a program is timed, it w ill proceed either to the "READY" posi-
tion or to the First Process. By selecting the First Process in the LOOPING Mode men u ,
the MP2+ can b e programmed into a contin u o u s program loop ( See Page 179, Table 49
(diagnostic men u )).
Untimed
(Manual)
Processes An u ntimed Process w ill remain in the Process indefinitely u ntil B u tton 1 is p u shed and
released or TB1 is momentarily latched. P u shing and releasing B u tton 1 or the momentary
latching of the TB1 w ill ca u se the MP2+ System to proceed to the next Process. If the last
Process of a program is u ntimed, p u shing and releasing B u tton 1 or the momentary latch-
ing of TB1 w ill ca u se the MP2+ system to proceed to the selected program start position.
M u ltiple contacts u sed to s w itch u ntimed Processes are to b e w ired in parallel.
Abortin g a
Timed Process
P u sh and release B u tton 1 or momentarily latch TB1 t w ice w ithin a 10 second period or
latch and hold contin u o u sly for 10 seconds.
Observed Problem Possible Cause Remedy
A No Gas Flo w 1
Mod u lating v al v e improperly
installed
1
Install w ith arro w on v al v e pointing in
direction of gas flo w .
B
Contin u o u s lo w fire
(electronic pro b lem)
1
Short circ u it or no v oltage to the
amplifier
1
Pro v e the po w er so u rce b y checking for
24V AC at amplifier
2
Open circ u it in TS194(Q) Dis-
charge Air Sensor or w iring.
2
Check TS194(Q) for open circ u it. See
Temperat u re Sensor F u nction of Pre-
liminary Circ u it Analysis.
3 Fa u lty MP2 2
Perform remedy for possi b le ca u se 1
and 2 a b o v e. If mod u lating v oltages are
still not o b tained, MP2 may b e
ass u med fa u lty. Replace.
C
Contin u o u s lo w fire
(electronics OK)
1
Short circ u it or open circ u it in
Mod u lator Coil.
1
Meas u re resistance across the mod u -
lator terminals w ith connecting w ires
detached. Replace mod u lator head if
not approximately 45-55 ohms for
M611 Val
v e, 50-65 ohms for M511
Val v e and 60-80 ohms for MR212 and
M411 v al v e.
2
Pl u nger missing, jammed or
improperly installed.
2
Inspect. Pl u nger sho u ld b e smooth,
clean and operate freely in solenoid
slee
v e. Clean or replace pl u nger if nec-
essary. Do not u se l ub ricants of any
type.
D
Incorrect lo w fire, erratic
or p u lsating flame
1
Incorrect b y-pass metering
adj u stment.
1
Adj u st to proper lo w fire. See Val v e
Adj u stments for lo w fire adj u stment.
2
Excessi v e negati v e bu rner pres-
s u re.
2
Close main gas s u pply and meas u re
manifold press u re w ith b lo w er operat-
ing. Reading sho u ld b e less than 1.5"
w c negati v e press u re. If reading is
greater than 1.5" w c negati v e press u re,
check for clogged filter or other inlet air
restrictions. Cons
u lt factory for other
sol u tions.