Daikin DP14CM Installation Manual

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3. Slowly raise the heating temperature setting. When the heating
first stage makes contact, stop raising the temperature setting.
The compressor, blower and fan should now be running with
the reversing valve in the de-energized (heating) position. After
giving the unit time to settle out, make sure the unit is supplying
heated air.
4. If the outdoor ambient is above 80°F, the unit may trip on its
high pressure cut out when in heating. The compressor should
stop. The heating cycle must be thoroughly checked, so
postpone the test to another day when conditions are more
suitable. DO NOT FAIL TO TEST.
5. If the outdoor ambient is low and the unit operates properly in
the heating cycle, you may check the pressure cutout operation
by blocking off the indoor return air until the unit trips.
6. If unit operates properly in the heating cycle, raise the
temperature setting until the heating second stage makes
contact. Supplemental resistance heat, if installed should
now come on. Make sure it operates properly.
NOTE: If outdoor thermostats are installed, the outdoor
ambient must be below the set point of these thermostats
for the heaters to operate. It may be necessary to jumper
these thermostats to check heater operation if outdoor
ambient is mild.
7. For thermostats with emergency heat switch, return to step
6. The emergency heat switch is located at the bottom of
the thermostat. Move the switch to emergency heat. The
heat pump will stop, the blower will continue to run, all
heaters will come on and the thermostat emergency heat
light will come on. 3-phase models are single stage heat
only.
8. If checking the unit in the wintertime, when the outdoor
coil is cold enough to actuate the defrost control, observe
at least one defrost cycle to make sure the unit defrosts
completely.
FINAL SYSTEM CHECKS
1. Check to see if all supply and return air grilles are adjusted and
the air distribution system is balanced for the best compromise
between heating and cooling.
2. Check for air leaks in the ductwork.
3. See Sections on Air Flow Measurement and Adjustment and
Checking Charge.
4. Make sure the unit is free of “rattles”, and the tubing in
the unit is free from excessive vibration. Also make sure
tubes or lines are not rubbing against each other or sheet
metal surfaces or edges. If so, correct the trouble.
5. Set the thermostat at the appropriate setting for cooling
and heating or automatic changeover for normal use.
6. Be sure the Owner is instructed on the unit operation, filter,
servicing, correct thermostat operation, etc.
The foregoing “Start-up Procedure and Check List” is recommended to
serve as an indication that the unit will operate normally.
COMPONENTS
CRANKCASE HEATER
This item is “ON” whenever power is supplied to the unit and the
crankcase heater thermostat is closed. Crankcase heater thermostat
closes at 67° and opens at 85°. It warms the compressor crankcase
thereby preventing liquid migration and subsequent compressor
damage. The insert type heater is self regulating. It is connected
electrically to the contactor L1 and L2 terminals.
CONDENSER MOTOR
This item is activated by the contactor during heating and cooling, except
during defrost and emergency heat operation.
COMPRESSOR
This item is activated by the contactor for heating and cooling, except
during emergency heat. It is protected by an internal overload.
CONTACTOR RELAY
This control is activated by the thermostat (24V coil) and supplies power
to the compressor and condenser fan motor.
DEFROST CONTROL
The Defrost control provides time/temperature initiation and termina-
tion of the defrost cycle. When a Defrost cycle is initiated, the defrost
control shifts the reversing valve to “COOLING” mode, stops the outdoor
fan and brings on supplemental heat. Normally, a Defrost cycle will take
only 2-3 minutes unless system is low on charge or outdoor conditions
are severe. (windy and cold). The defrost control also provides for a 3
minute off cycle compressor delay.
OUTDOOR T HERMOSTAT
These optional controls are used to prevent full electric heater operation
at varying outdoor ambient (0° F-to 45° F). They are normally open above
their set points and closed below to permit staging of indoor supplement
heater operation. If the outdoor ambient temperature is below 0° F (-18°
C) with 50% or higher RH, an outdoor thermostat (OT) must be installed
and set at (0°) on the dial. Failure to comply with this requirement may
result in damage to the product which may not be covered by the
manufacturer’s warranty.
REVERSING VALVE COIL
This coil is activated by the thermostat, in the cooling mode and during
defrost. It positions the reversing valve pilot valve for cooling operation.
INDOOR BLOWER MOTOR
This is activated by the room thermostat by COOLING or FAN ON position.
The motor is energized through the EBTDR for PSC motors and directly by
the room thermostat for EEM motors (4 or 5 Ton units). EEM motors are
constant torque motors with very low power consumption. This motor is
energized by a 24V signal from the thermostat. (See Air Flow Measure-
ment and Adjustment for speed adjustment instructions).
BLOWER INTERLOCK RELAY (SINGLE PHASE PSC MODELS ONLY)
This relay is used to energize the blower during the electric heat opera-
tion. Some room thermostats do not energize the motor during electric
heat. This relay insures blower operation when the room thermostat
energizes heat. This relay has a 240 volt coil and an 8 amp contact relay.
This relay is energized by the electric heat kit sequencer.