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TUUINNING INTERFACE
lf the control has slx sct€w temanab, one d rlEt
ls
doslgnated TwlN, the control ts equtpped wt|h a shgb wtre
twlnnhg InteilaGe. lf mhnlng ls used, ellher qtd
wtll
prooess a call for heat, cool or f,an as descrtod &ve.
However, afterthe heat-, cool-, orfan-on delaytn: orplres,
both unlts vllll energlze the ctrculator blowsrs d OF same
Ume. Llkewlse, after lhe heat-, cooF, or land
dolly Ume
explres, both untts wlllde.energlze the clrcUlatorbbrers at
the sarne tme. Thts allows for proper atr flow to be ohhed.
To assure proper control opetatlon, both contob nnrst sfrare
a oommon translormer grcund (IR).
To enable Mnnlng, do the followang.
1 . Power supplled to both fumaces must be lrorn the same
phase of the Incomlng 120 VAC power.
2- Gonnect the TWIN screw termtnals on the 5OA5$8f3 of
the fumaces to be twhn€d to each other uslng a sftgle
wtrc (14-2. AWG.).
SYSTET LOCKOUT AND
DIAGNOSTIC FEATURES
SYSTEM LOCKOT'T FEATURES
When rys'lem lod<ort omrns, the gas vahrc ls deeneetred, the
clrurlator Umr
ls eneqlzed at heat speed, and, lf flarne ts
sensed, the hducerblouverls energlzed. The diagnostc indlca-
tor ltght wlll flash or glow contnuoudy to Indacate system status.
(S1lsErr lo.*out uill never oventde the precautonary fiea-
tms.l
To rrset tfre confrol dbr sy'stum locttout, do one d the
followlng:
1. Interuptthe call for heat orcool atthe thermostatforat least
txle second hn |ss tltan 20 seconds (tf flame ls sens€d
rrulth tte gas vahrc deene€lzed, Intemlpdng the cafl br
heat at the thermostat wlll not rcset the contol).
2. hrem$the 24 VAC potrerdUte @ord brd least one
second. Yor mayaboneedto resdttefiame rcllontseruior
surltcfi.
3. After one horr In lodout, lhe conbol wlll autornatlcally reset
nsef.
TtrEms5o[t
hgoba
ttdl'||dtildasdlbe
ma+
dEm|sonElecttco
DtAGNOSnb relrunes
Tho Cl^s+.iSag contol conunuorsly monllors lts own operatql
and fp opedon of the system. !f a fiallurc occurc, the LED wlll
lndcfr ail.re
code as shorn bebn lf $e fallurc b Inbrnal
to 0f cortol, the [gm wil stay on contnuorslyl. In this
ccr, Or onlfic contrcl should be rcplaced, m the control
b ndlld<epdrabb.
It tlp sensed tatlur€ ls In the system (external to the conbol), the
LEDdnash an the bllotrlng flashaause sequencesto Indlcate
fiafurB stafrF (@ch nash wllllastapgoxlmately0-25 seoonds,
and edt pause wlll last apgoxlmately 2 seoonds).
1 nash,lhen pause
qptem lod<out
2flasfies, then pause
Prcssurc swltch strckdosed
3 nasfies, then pause
Prcssure svlbfi stttd< open
4 nastps, then pause
Open llmlt snitcfi
5flasfies, then pause
Open rcllot tsa,ltctl
Gflashes,thenpause
115 Volt AC power reversetUlrr
prcper grwnd
7 flaslrcq then pause
Low flame sense slgnal
Contnuors flashlng
Flame has been sensed when
(nopause)
nofiarnesftoddbepesrf (m
caf brhd)
The tED wlll aho frasfi ce
e[ pffi-rp.
7
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