21
Model
Superheat
±2°F
Subcooling
±1°F
Expansion
Device
Cooling
Stage
Ambient
*PGM324***41 7 - Piston high 95
*PGM330***41 4 - Piston high 95
*PGM336***41 5 - Piston high 95
*PGM342***41 7 - Piston high 95
*PGM348***41 15 - Piston high 95
*PGM361***41 6 8 TXV low 82
Design Superheat & Subcool
Cooling Operation
127(0ඍඋඐඉඖඑඋඉඔඋඔඑඖඏඋඉඖඖගඊඍකඍඔඑඉඊඔඡක-
ඞඑඌඍඌඉගඉඕඊඑඍඖගගඍඕඍකඉගඝකඍඛඊඍඔඟ)
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the
&22/SRVLWLRQRU$872LIDYDLODEOHDQGLIDXWRPDWLF
FKDQJHRYHUIURPFRROLQJWRKHDWLQJLVGHVLUHG
3. Set the room thermostat to the desired temperature.
TROUBLESHOOTING
,ඏඖඑගඑඖ&ඖගකඔ(කකක&ඌඍඛ
The following presents probable causes of questionable
unit operation. Refer to Diagnostic Indicator Chart for
an interpretation of the signal and to this section for an
explanation.
Remove the control box access panel and note the number
RIGLDJQRVWLF/('ÀDVKHV5HIHUWR'LDJQRVWLF,QGLFDWRU
Chart for an interpretation of the signal and to this section
for an explanation.
)DXOW5HFDOO7ZR6WDJH0RGHOV21/<
The ignition control is equipped with a momentary
push-button switch that can be used to display on the diag-
QRVWLF/('WKHODVW¿YHIDXOWVGHWHFWHGE\WKHFRQWURO7KH
FRQWUROPXVWEHLQ6WDQGE\0RGHQRWKHUPRVWDWLQSXWVWR
use the feature. Depress the push-button switch for approx-
imately 2 seconds. NOTE: Do not hold for longer than 4
seconds. Holding the button for 4 seconds or higher
will erase the memory! Release the switch when the
/('LVWXUQHGRႇThe diagnostic LED will then display
WKHÀDVKFRGHVDVVRFLDWHGZLWKWKHODVW¿YHGHWHFWHGIDXOWV
The order of display is the most recent fault to the least
recent fault.
$2+
Internal Control Failure
If the integrated ignition control in this unit encounters an
LQWHUQDOIDXOWLWZLOOJRLQWRD³KDUG´ORFNRXWDQGWXUQRႇWKH
diagnostic LED. If diagnostic LED indicates an internal
fault, check power supply to unit for proper voltage, check
all fuses, circuit breakers and wiring. Disconnect electric
SRZHUIRU¿YHVHFRQGV,I/('UHPDLQVRႇDIWHUUHVWRULQJ
power, replace control.
External Lockout
An external lockout occurs if the integrated ignition control
determines that a measurable combustion cannot be estab-
OLVKHGZLWKLQWKUHHFRQVHFXWLYHLJQLWLRQDWWHPSWV,IÀDPH
LVQRWHVWDEOLVKHGZLWKLQWKHVHYHQVHFRQGWULDOIRULJQL-
tion, the gas valve is de-energized, 15 second inter-purge
cycle is completed, and ignition is reattempted. The control
will repeat this routine three times if a measurable com-
EXVWLRQLVQRWHVWDEOLVKHG7KHFRQWUROZLOOWKHQVKXWRႇWKH
induced draft blower and go into a lockout state.
,IÀDPHLVHVWDEOLVKHGEXWORVWWKHFRQWUROZLOOHQHUJL]H
the circulator blower at the heat speed and then begin a
QHZLJQLWLRQVHTXHQFH,IÀDPHLVHVWDEOLVKHGWKHQORVWRQ
VXEVHTXHQWDWWHPSWVWKHFRQWUROZLOOUHF\FOHIRUIRXU
FRQVHFXWLYHLJQLWLRQDWWHPSWV¿YHDWWHPSWVWRWDOEHIRUH
locking out.
7KHGLDJQRVWLFIDXOWFRGHLVÀDVKIRUDORFNRXWGXHWR
IDLOHGLJQLWLRQDWWHPSWVRUÀDPHGURSRXWV7KHLQWHJUDWHG
control will automatically reset after one hour, or it can be
reset by removing the thermostat signal or disconnecting
WKHHOHFWULFDOSRZHUVXSSO\IRURYHU¿YHVHFRQGV,IWKH
diagnostic LED indicates an external lockout, perform the
IROORZLQJFKHFNV
&KHFNWKHVXSSO\DQGPDQLIROGSUHVVXUHV
&KHFNWKHJDVRUL¿FHVIRUGHEULV
&KHFNJDVYDOYHIRUSURSHURSHUDWLRQ
&KHFNVHFRQGDU\OLPLW
$GLUW\¿OWHUH[FHVVLYHGXFWVWDWLFLQVXႈFLHQWDLUÀRZD
faulty limit, or a failed circulator blower can cause this limit
WRRSHQ&KHFN¿OWHUVWRWDOH[WHUQDOGXFWVWDWLFFLUFXODWRU
EORZHUPRWRUEORZHUPRWRUVSHHGWDSVHHZLULQJGLD-
JUDPDQGOLPLW$QLQWHUUXSWLRQLQHOHFWULFDOSRZHUGXULQJ
a heating cycle may also cause the auxiliary limit to open.
The automatic reset secondary limit is located on top of the
circulator blower assembly.
&KHFNUROORXWOLPLW
,IWKHEXUQHUÀDPHVDUHQRWSURSHUO\GUDZQLQWRWKHKHDW
H[FKDQJHUWKHÀDPHUROORXWSURWHFWLRQGHYLFHZLOORSHQ
3RVVLEOHFDXVHVDUHUHVWULFWHGRUEORFNHGÀXHSDVVDJHV
blocked or cracked heat exchanger, a failed induced draft
EORZHURULQVXႈFLHQWFRPEXVWLRQDLU7KHUROORXWSURWHFWLRQ
device is a manual reset limit located on the burner brack-
HW7KHFDXVHRIWKHÀDPHUROORXWPXVWEHGHWHUPLQHGDQG
corrected before resetting the limit.
&KHFNÀDPHVHQVRU
$GURSLQÀDPHVLJQDOFDQEHFDXVHGE\QHDUO\LQYLVLEOH
coating on the sensor. Remove the sensor and carefully
clean with steel wool.
&KHFNZLULQJ
Check wiring for opens/shorts and miswiring.
IMPORTANT:,ඎඡඝඐඉඞඍගඎකඍඝඍඖගඔඡකඍඛඍගඡඝක
ඏඉඛඍඔඍඋගකඑඋඉඋඓඉඏඍඝඖඑගඑගඕඍඉඖඛගඐඉගඉකඊඔඍඕ
ඍචඑඛගඛගඐඉගඛඐඝඔඌඊඍඋකකඍඋගඍඌ&ඖගඉඋගඉඝඉඔඑ-
ඎඑඍඌඛඍකඞඑඋඍකඎකඎඝකගඐඍකඑඖඎකඕඉගඑඖ