encountered, shut OFF electric power immediately. Recheck for
wiring errors, or obstructions in or near blower motors.
Circulating Air Blower
1.Be sure electric power is OFE
2.Set thermostat Heat-Cool selector to OFE
3.Set thermostat fan switch to AUTO
4.Turn electric power ON. Nothing should start running.
5.Set thermostat fan switch to ON. The circulating air blower
should come ON.
6.Reset thermostat fan switch to AUTO. The circulating air
blower should go OFF after a 60 second delay for models
PHM324-42 and 90 second delay for PHM348-54. Nothing
should be running.
Cooling
1. Be sure that electric power is OFF.
2. Set thermostat Heat-Cool select to COOL.
3. Adjust thermostat setting to below room temperature.
4. Turn electric power ON. During power application check the
following:
a. Contactor - Contacts closing
b. Compressor - ON
c. Condenser fan motor - ON
d. Circulating air blower - ON (after delay)
5.Switch the thermostat to OFF, check the fol!owing:
a. Contactor contacts opening.
b. Compressor - OFF
c. Condenser fan motor - OFF
d. Circulating blower - OFF (after delay)
6.Turn electric power OFF
Defrost Control Time Interval Adjustment
ELECTRICAL SHOCK HAZARD.
Failure to follow this warning could result in personal
injury and/or death.
Turn OFF electric power supply at disconnect switch
or service panel before removing any access or
service panel from unit.
To adjust defrost intervah
1.Turn off all power to Heat Pump.
2.Remove control box cover.
3.Locate electronic defrost control board.
4.The Defrost Control Board has a dip switches that can be set
at 30, 60, 90 or 120 minutes. Factory setting is 60 minutes.
See Figure 10 for Defrost settings. For service test, refer to
sequence of operation for defrost mode on next page.
/
Figure 10 / Defrost Dip Switch Settings
DIP SWITCH SETTINGS
(D(TAULT)
30 #lUUlrS S0WIHuI(S gO#IHuI(S 120WIHuI(S
FI(LD S(L(¢TASL( OPTIOUS F0R TIN[ P[UIO0
6(Tgt(ll KrROSI CTCL(S (NlUUI(S)
TH( CONPR(SSOR WILL SHUT OfT roll )o s(¢, oil 0(TIIOST
lUlIIATIOHAnDT(RWlUAIIORIn TH( "OUI(I SHIRT"OI
POSlIIOR
SP((O_"I-------"_'I--_ JUIf(R(0 T(ST PINS (US( N(TAL 06J(¢f)
f I(L0 SP((0-UP ¢lrCL(
1) NON[IITARILT SHORT PlUS All0 R(L(AS( TO IBTPASS
¢QMPRrSSOa OFT 0(LAlr.
21 SHOAT FOR S* S(C. AND II(L(AS( FOR FOUC(0 0(FROST.
)) P(RNAH(H! SKQRTWILL 8( IGIIOR(0,
0[reOST WILL T[RHIUAT( IH $0 S[¢, Ir OFT OP[N,
0[fROST gILL T[IZMIUAT( UORNALLY Ir 0rT IS ¢LOS[0,
D£FRO ST BOARD
D]? SWITCES
12 427 01 1101 O0
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