Carrier 50PEC09-18 - Manual (Page 29)

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7. System Control: To ensure no catastrophic system fail-
ures occur, verify system controls are functioning and the
sequencing is correct.
8. Freeze Protection for Water Systems: Verify freeze
protection is provided for the outdoor portion of the loop
water system. Inadequate freeze protection leads to
expensive repairs.
9. System Water Loop: Verify all air is bled from the sys-
tem. Air in the system impedes unit operation and causes
corrosion in the system piping.
10. Unit Filters: To avoid system damage and to provide
maximum performance, ensure the unit filter is clean.
11. Unit Fans: Manually rotate fans to assure free rotation.
Ensure fans are properly secured to the fan shaft. Do not
oil fan motors on start-up since they are lubricated at the
factory.
12. System Control Center: To ensure control of the tempera-
ture set points for operation of the system’s heat rejector
and boiler, examine the system control and alarm panel
for proper installation and operation.
FIELD SELECTABLE INPUTS
Jumpers and DIP (dual in-line package) switches on the
control board are used to customize unit operation and can be
configured in the field.
Complete C Control Jumper Settings (See
Fig. 17, 18, and 21)
WATER COIL FREEZE PROTECTION (FP1) LIMIT
SETTING — Select jumper 3, (JW3-FP1 Low Temp) to
choose FP1 temperature limit of –12.2 C or –1.1 C. To select
–1.1 C as the temperature limit, DO NOT clip the jumper. To
select –12.2 C as the limit, clip the jumper.
ALARM RELAY SETTING — Select jumper 1 (JW1) for
connecting alarm relay terminal (AL2) to 24-vac (R) or to re-
main as a dry contact (no connection). To connect AL2 to R, do
not clip the jumper. To set as dry contact, clip the jumper.
Complete C Control DIP Switches — The Com-
plete C control has one DIP switch block with five switches.
See Fig. 17, 18, and 21.
PERFORMANCE MONITOR (PM) — DIP switch 1 will
enable or disable this feature. To enable the PM, set the switch
to ON. To disable the PM, set the switch to OFF.
STAGE 2 — DIP switch 2 will enable or disable compressor
delay. Set DIP switch to OFF for Stage 2 in which the compres-
sor will have a 3-second delay before energizing.
SWITCH 3 AND SWITCH 4 — Not used.
FREEZE PROTECTION (FP1) — DIP switch 5 is used to
initiate one or 3 tries for the FP1 fault. If there is water freeze
protection for the water coil then DIP switch 5 can be set to
lock out on the FP1 fault after one try. ON = One try.
OFF = 3 tries.
Deluxe D Control Jumper Settings (See Fig. 19,
20, and 22)
WATER COIL FREEZE PROTECTION (FP1) LIMIT
SETTING — Select jumper 3, (JW3-FP1 Low Temp) to
choose FP1 temperature limit of –12.2 C or –1.1 C. To select
–1.1 C as the temperature limit, DO NOT clip the jumper. To
select –12.2 C as the limit, clip the jumper.
ALARM RELAY SETTING — Select jumper 4 (JW4-AL2
Dry) for connecting alarm relay terminal (AL2) to 24-vac (R)
or to remain as a dry contact (no connection). To connect AL2
to R, do not clip the jumper. To set as dry contact, clip the
jumper.
LOW PRESSURE SETTING — The Deluxe D control can
be configured for low pressure setting (LP). Select jumper 1
(JW1-LP Norm Open) for choosing between low pressure in-
put normally opened or closed. To configure for normally
closed operation, do not clip the jumper. To configure for nor-
mally open operation, clip the jumper.
Deluxe D Control DIP Switches — The Deluxe D
control has 2 DIP switch blocks. Each DIP switch block has
8 switches and is labeled either S1 or S2 on the circuit board.
See Fig. 19, 20, and 22.
DIP SWITCH BLOCK 1 (S1) — This set of switches offers
the following options for Deluxe D control configuration:
Performance Monitor (PM) — Set switch 1 to enable or dis-
able performance monitor. To enable the PM, set the switch to
ON. To disable the PM, set the switch to OFF.
Compressor Relay Staging Operation — Switch 2 will en-
able or disable compressor relay staging operation. The
compressor relay can be set to turn on with Stage 1 or Stage 2
call from the thermostat. This setting is used with dual stage
units (units with 2 compressors and 2 Deluxe D controls) or in
master/slave applications. In master/slave applications, each
compressor and fan will stage according to its switch 2 setting.
If switch is set to Stage 2, the compressor will have a 3-second
delay before energizing during stage 2 demand.
NOTE: If DIP switch is set for Stage 2, the alarm relay will not
cycle during Test mode.
Heating/Cooling Thermostat Type — Switch 3 provides selec-
tion of thermostat type. Heat pump or heat/cool thermostats
can be selected. Select OFF for heat/cool thermostats. When in
heat/cool mode, Y1 is used for Cooling Stage 1, Y2 is used for
Cooling Stage 2, W1 is used for Heating Stage 1 and O/W2 is
used for Heating Stage 2. Select ON for heat pump applica-
tions. In heat pump mode, Y1 used is for Compressor Stage 1,
Y2 is used for Compressor Stage 2, W1 is used for Heating
Stage 3 or emergency heat, and O/W2 is used for RV (heating
or cooling) depending upon switch 4 setting.
O/B Thermostat Type — Switch 4 provides selection for heat
pump O/B thermostats. O is cooling output. B is heating out-
put. Select ON for heat pumps with O output. Select OFF for
heat pumps with B output.
Dehumidification Fan Mode — Switch 5 provides selection
of normal or dehumidification fan mode. Select OFF for dehu-
midification mode. The fan speed relay will remain OFF dur-
ing Cooling Stage 2. Select ON for normal mode. The fan
speed relay will turn on during Cooling Stage 2 in normal
mode.
Switch 6 — Not used.
Boilerless Operation — Switch 7 provides selection of boil-
erless operation and works in conjunction with switch 8. In
boilerless operation mode, only the compressor is used for
heating when FP1 is above the boilerless changeover tempera-
ture set by switch 8 below. Select ON for normal operation or
select OFF for boilerless operation.
Boilerless Changeover Temperature — Switch 8 on S1 pro-
vides selection of boilerless changeover temperature set point.
CAUTION
To avoid equipment damage, DO NOT leave system filled
in a building without heat during the winter unless anti-
freeze is added to system water. Condenser coils never
fully drain by themselves and will freeze unless winterized
with antifreeze.
IMPORTANT: Jumpers and DIP switches should only
be clipped when power to control board has been turned
off.