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SSP-SVX15C-EN
cooling applications. If the unit is configured with a
zone sensor, switchover valve 1 (SOV1) and switchover
valve 2 (SOV2) are energized for the duration of the
Cooling mode and do not change states until the unit
either enters OOFFFF mode or transitions to Heat mode. If
the unit is controlled with a thermostat, SOV1 and
SOV2 are energized while the thermostat W1/O signal
output to the RTRM is active.
The outdoor fans (ODF) will turn OONN and OOFFFF with the
compressors. Circuit 1 fan cycles with compressor 1
and circuit 2 fan will cycle with compressor. If a
compressor is turned OOFFFF, the anti-short cycle timer
(ASC) will hold the compressor OOFFFF for 3 minutes. See
Table 7, p. 30, Table 8, p. 31, Table 9, p. 31, and Table
10, p. 31 for the staging, sequence, and control.
Demand Defrost
When power is first applied to the unit, the first
demand-defrost cycle will be initiated based on a
cumulative run time of exactly 30 minutes only at the
required conditions. The cumulative run time at the
required conditions is tracked separately for each
compressor.
Shortly after completion of the first defrost cycle, the
system control calculates the temperature difference
between the outdoor coil and outdoor air, using the
result as an indicator of unit performance at dry coil
conditions.
Conditions Triggering the Defrost Cycle
Over time, as moisture and frost accumulate on the
coil, the coil temperature will drop, increasing the
temperature difference. When the temperature
difference is large enough, a defrost cycle is initiated.
Demand Defrost is initiated when the outdoor air
temperature (OAS) is below 52°F and the outdoor coil
temperature (CTS) is below 33°F.
Single and Dual Circuits
When a circuit enters Defrost mode, the compressor
will remain energized, the associated outdoor fan
(ODF) will de-energize, the associated switchover valve
(SOV) output will energize, and the first stage of
Auxiliary Heat energizes.
On dual circuit units, the opposite circuit's state will
remain unchanged if a defrost cycle has not been
initiated on that circuit. Each circuit will enter defrost
independently based on its associated Outdoor Coil
Temperature Sensor (CTS), the Outdoor Air
Temperature Sensor (OAS), and its total accumulated
run time.
Termination of the Defrost Cycle
A circuit will leave defrost, during normal conditions,
once the outdoor coil temperature reaches the outdoor
air temperature + 47°F which must be above 57°F and
not greater than 72°F. Termination of the defrost cycle
includes a "Soft Start" delay of 5 seconds for the
switchover valve (SOV) where the outdoor fans (ODF)
are turned on 5 seconds before the switchover valve
(SOV) is returned to the heating position to help
smooth the transition.
Behavior of Switchover Valves
The switchover valves (SOV) will both be energized
during cooling mode and will be de-energized during
Heat or OOFFFF mode. However, during a defrost cycle,
only the circuit that requires a defrost cycle will
energize its switchover valve (SOV). For thermostat
control, if a thermostat is requesting for the switchover
(SOV) to be energized or de-energized, both switchover
valve (SOV) outputs will follow the thermostat request
(unless a circuit is in a defrost cycle).
Defrost Configuration Facts
Units are configured from the factory to have
Independent Circuit defrost (RTRM input J9-3 tied to
ground with RTRM input J1-5 OPEN).
Table 7. Heat pump operation with thermostat
Inputs Outputs
Y1 Y2 G W1 W2 O X2 Cool Heat1 Indoor Fan
ON OFF
Don't
Care
Don't
Care
OFF HEAT OFF OFF
Stage 1
ON
OFF ON
Don't
Care
Don't
Care
OFF HEAT OFF OFF
Stage 2
ON
ON ON
Don't
Care
Don't
Care
OFF HEAT OFF OFF
Stage 1 +
Stage 2
ON
ON OFF
Don't
Care
Don't
Care
ON HEAT OFF OFF
Stage 1 +
Auxiliary
ON
OFF ON
Don't
Care
Don't
Care
ON HEAT OFF OFF
Stage 2 +
Auxiliary
ON
ON ON
Don't
Care
Don't
Care
ON HEAT OFF OFF
Stage 1 +
Stage 2 +
Auxiliary
ON
SSttaarrtt--UUpp
- Installation, Operation 1
- Introduction 2
- Copyright 3
- Trademarks 3
- Revision History 3
- Table of Contents 4
- Model Number Description 6
- General Information 7
- Pre-Installation 8
- Unit Mounting 9
- Snow Belt Recommendations 9
- Dimensional Data 10
- SSP-SVX15C-EN 11
- FRO NT DETAIL A 13
- Heat Pump Condenser 14
- Installation 15
- Refrigerant Piping Procedures 16
- (Outdoor Units) 16
- Leak Check 17
- (Indoor Unit) 17
- Insulating and Isolating 18
- Refrigerant Lines 18
- Liquid Charging 19
- Electrical Wiring 19
- WWAARRNNIINNGG 20
- NNOOTTIICCEE 20
- Field Wiring 21
- IInnssttaallllaattiioonn 22
- Electrical Data 24
- Charging Charts and Superheat 25
- Installation Checklist 26
- Pre-Start 27
- Start-Up 28
- Mechanical Heat 29
- Auxiliary Heat 29
- Emergency Heat 29
- SSttaarrtt--UUpp 29
- Demand Defrost 30
- Test Modes 33
- Troubleshooting 34
- Resetting Cooling and Heating 35
- Lockouts 35
- Zone Temperature Sensor (ZTS) 35
- Service Indicator 35
- Temperature Tests 36
- Sensor Test 37
- Maintenance 38
- Maintenance Log 39
- Wiring Diagram Matrix 40
Verwandte Produkte und Handbücher für Split-System-Klimaanlagen Bryant R-22
(60 Seiten)
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