Quiet Shift; Quiet Shift-2 (Communicating Models) (Part # Hk38Ea016, Hk38Ea022, Hk38Ea023); Liquid-Line Solenoid Accessory; Check Charge - Bryant Base Series Application Manual And Service Manual

Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual
Defrost Hold
In a non-communicating system, if the thermostat becomes satisfied (Y1
or Y1 and Y2) before the defrost cycle is terminated, the control will
"hold" in defrost mode and finish the defrost cycle on the next call for
heat.
With communicating Evolution Control, defrost hold is not needed in a
communicating system because the User Interface will complete the
defrost cycle before shutting down the system.
Forced Defrost
With non-communicating (non-Evolution) control, forced defrost can be
initiated by manually shorting the 2-pin header labeled FORCED
DEFROST (see Fig 45) on the control board for 5 seconds then
releasing.
With communicating (Evolution) control, forced defrost is initiated with
the User Interface.
On all models, during a Forced Defrost:
• If coil temperature is at defrost temperature of 32_F, and outdoor
air temperature is below 50_F, a full defrost sequence will occur.
• If coil temperature or outdoor air temperature does not meet the
above requirements, an abbreviated 30 second defrost will occur.
• Both Quiet Shift and Quiet Shift-2 compressor ON/OFF delays will
be included in a forced defrost if either are enabled.

Quiet Shift

Quiet Shift is a field-selectable defrost mode which may eliminate
occasional noise that could be heard at the start of the defrost cycle and
restarting of the heating cycle. On models with a non-communicating
system, this feature must be enabled by selecting the 3rd position of the
3-position dip switch. For models with communicating (Evolution)
systems, it must be enabled at the User Interface. When activated, the
following sequence of operation will occur.
energize and compressor will turn off for 30 seconds, then turn back on
to complete defrost. At the end of the defrost cycle, the reversing valve
de-energizes, compressor will turn off for another 30 seconds, and the
fan will turn off for 40 seconds, before starting in the heating mode.
Quiet Shift-2 (communicating models)
(part # HK38EA016, HK38EA022, HK38EA023)
Quiet Shift-2 is a field selectable defrost mode which may eliminate
occasional noise that could be heard at the start and finish of the defrost
cycle.
On a non-communicating system, this feature must be enabled by
selecting the 3rd position of the 3-position dip switch on the outdoor
control board. For communicating systems, it must be enabled at the
User Interface. When activated, the following sequence of operation
occurs:
Defrost Initiation – The compressor is de-energized for 70 seconds.
During this 70 second compressor off time, the reversing valve will be
energized. Once the 70 second compressor off time has been reached,
the compressor will be energized then the outdoor fan will be
de-energized at which time the normal defrost cycle begins.
Defrost Termination – the outdoor fan will be energized shortly before
the compressor is de-energized for 60 seconds. During the compressor
60 second off time, the reversing valve will be de-energized. Once the 60
second compressor off time has been completed, the compressor will be
energized at which time the system will be in normal heat mode.

Liquid-Line Solenoid Accessory

In heat pump long-line applications, a liquid-line solenoid is required to
control refrigerant migration in the heating mode. The solenoid should
be installed near the outdoor unit with the arrow facing the outdoor unit.
This is the direction of flow control. See application manual for
long-line application details.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Accessory Liquid Solenoid with Evolution
Communicating Control:
When using the Evolution Control, the liquid-line solenoid output is
provided at the Y1 connection. Connect the solenoid as shown in the
wiring label diagram. This is a 24vac output that is energized whenever
the compressor is energized. It closes, in the compressor off mode, to
prevent refrigerant migration into the unit through the liquid-line.
On Models with Accessory Liquid Solenoid Using a
Non-Communicating Thermostat:
The liquid solenoid is connect to the Y1 and C terminal connections. The
liquid solenoid closes, in the compressor off mode, to prevent refrigerant
migration into the unit through the liquid-line.

Check Charge

All 286B units must be charged in high stage only.
(See Charging
Factory charge amount and desired subcooling are shown on unit rating
plate. Charging method is shown on information plate inside unit. To
properly check or adjust charge, conditions must be favorable for
subcooling charging. Favorable conditions exist when the outdoor
temperature is between 70_F/21.11_C and 100_F/37.78_C, and the
indoor temperature is between 70_F/21.11_C and 80_F/26.67_C. Follow
the procedure below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge by
adding or removing 0.6 oz/ft of 3/8 liquid line above or below 15ft (4.57
m) respectively.
For standard refrigerant line lengths (80 ft/24.38 m or less), allow system
to operate in cooling mode at least 15 minutes. If conditions are
favorable, check system charge by subcooling method. If any adjustment
is necessary, adjust charge slowly and allow system to operate for 15
Reversing valve will
minutes to stabilize before declaring a properly charged system.
If the indoor temperature is above 80_F/26.67_C, and the outdoor
temperature is in the favorable range, adjust system charge by weight
based on line length and allow the indoor temperature to drop to
80_F/26.67_C before attempting to check system charge by subcooling
method as described above.
If the indoor temperature is below 70_F / 21.11_C, or the outdoor
temperature is not in the favorable range, adjust charge for line set length
above or below 15ft (4.57 m) only. Charge level should then be
appropriate for the system to achieve rated capacity. The charge level
could then be checked at another time when the both indoor and outdoor
temperatures are in a more favorable range.
NOTE: If line length is beyond 80 ft (24.38 m) or greater than 20 ft
(6.10 m) vertical separation, See Long Line Guideline for special
charging requirements.

Heating Check Chart Procedure

To check system operation during heating cycle, refer to the Heat Pump
Charging Instructions label on outdoor unit. This chart indicates whether
a correct relationship exists between system operating pressure and air
temperature entering indoor and outdoor units. If pressure and
temperature do not match on chart, system refrigerant charge may not be
correct. Do not use chart to adjust refrigerant charge.
NOTE: In heating mode, check refrigerant charge only when pressures
are stable. If in doubt, remove charge and weigh in correct refrigerant
charge.
NOTE: When charging is necessary during heating season, charge must
be weighed in accordance with unit rating plate, ±0.6 oz./ft. of 3/8-in.
liquid-line above or below 15 ft., respectively.
EXAMPLE:
To calculate additional charge required for a 25-ft. line set:
25 ft. - 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.
54
Table 11 & Table 13)