Allied ML14XP1-060 Інструкція з монтажу Посібник з монтажу - Сторінка 13
Переглянути онлайн або завантажити pdf Інструкція з монтажу Посібник з монтажу для Тепловий насос Allied ML14XP1-060. Allied ML14XP1-060 17 сторінок. Split system heat pump r410a refrigerant
Друкувати сторінкуChecking Refrigerant Charge
The ML14XP1 unit is factory-charged with enough HFC-
410A refrigerant to accommodate a 15-foot length of refrig-
erant piping. Charge should be checked and adjusted
using the tables provided on the charging procedure
sticker on the unit access panel. Detailed information
is given in the ML14XP1 Installation and Service Proce-
dures manual.
Defrost System
The defrost system includes a defrost thermostat (S6) and
a defrost control (CMC1).
DEFROST CONTROL (CMC1)
This defrost control includes the combined functions of a
time/temperature defrost control, defrost relay, time delay,
diagnostic LEDs and a terminal strip for field wiring con-
nections.
DEFROST CONTROL (CMC1)
DEFROST TIMING
PINS (P1)
TEST
PINS
COMPRESSOR
DELAY PINS
REVERSING
VALVE
S87
LOW PRESSURE
SWITCH
DEFROST
THERMOSTAT (S6)
S4
HIGH PRESSURE
SWITCH
FIGURE 15
The defrost control provides automatic switching from nor-
mal heating operation to defrost mode and back. When
the defrost thermostat is closed, the control accumulates
compressor run time at 30-, 60- or 90- minute field-adjust-
able intervals.
When the selected compressor run time interval is
reached, the defrost relay is energized and defrost begins.
Defrost Control Timing Pins (P1)
Each timing pin selection provides a different accumulat-
ed compressor run time period for one defrost cycle. This
time period must occur before a defrost cycle is initiated.
The defrost interval can be adjusted to 30 (T1), 60 (T2),
or 90 (T3) minutes (see figure 17). The maximum defrost
period is 14 minutes and cannot be adjusted.
NOTE - Defrost control part number is listed near the P1
timing pins.
• Factory default is 90 minutes.
• If the timing selector jumper is missing, the defrost con-
trol defaults to a 90-minute defrost interval.
Compressor Delay (P5)
The defrost control has a field-selectable function to re-
duce occasional sounds that may occur while the unit is
cycling in and out of the defrost mode.
The compressor will be cycled off for 30 seconds going in
and out of the defrost mode when the compressor delay
jumper is installed. (Factory default is jumper installed.)
NOTE - The 30-second compressor feature is ignored
when jumpering the TEST pins.
Time Delay
The timed-off delay is five minutes long. The delay helps
to protect the compressor from short-cycling in case the
power to the unit is interrupted or a pressure switch opens.
The delay is bypassed by placing the timer select jumper
across the TEST pins for 0.5 seconds.
Test Mode
The TEST mode is activated by removing the jumper on
the defrost termination pins (30, 60 or 90) and placing the
jumper on the TEST pins after 24VAC is applied to the
control. The low pressure input is ignored in TEST mode.
The TEST pins are ignored and the TEST function is
locked out:
DIAGNOSTIC
• If the jumper is applied on the TEST pin before 24VAC
LEDS
is applied to the control.
• If there is a jumper on the 30 or 60 minute defrost
termination pins.
24V TERMINAL
STRIP
CONNECTIONS
Bypass Anti-Short-Cycle Delay
The Y1 input must be active ON, the high pressure switch
SERVICE LIGHT
CONNECTIONS
must be closed or a jumper must be installed on the high
pressure terminals of the control.
Initiate a Force Defrost
The Y1 input must be active ON, the high pressure switch
must be closed or a jumper must be installed on the high
pressure terminals of the control, the defrost thermostat
must be closed or a jumper must be placed across the
DF terminals on the control and the O terminals must not
have 24VAC (no power to reversing valve) before control
will enter into a force defrost.
Test Mode Sequence / Clear Pressure Switch Lockout
Using the defrost termination pin, short the TEST pins for
a period of two seconds:
• Clear timed lockout / or pressure switch lockout func-
tion.
• Enter defrost mode.
After entering force defrost, if the jumper is removed be-
fore 5 seconds has elapsed, the unit will remain in forced
defrost mode until defrost thermostat opens or terminated
on maximum defrost time (14 minutes). If the jumper is not
removed, once 5 seconds has elapsed (7 seconds total),
the unit will terminate defrost and return to heat mode. The
TEST mode will then be lockedout and no further TEST
mode operation will be executed until the jumper on the
TEST pins is removed and reapplied to the applicable de-
frost termination pins.
Page 13
IMPORTANT