Options
The CL series economizer is designed for cooling only. If
heating economizer operation is desired, consult the factory
for applications and design information.
Refer to the Condensate Drain section on page #16.
13.4 Hot Gas Reheat
CL series heat pumps can be provided with an optional hot gas
reheat. The hot gas reheat option cools and dehumidifies the
supply air by running the air through air coil heat exchanger (hot
gas reheat coil) mounted down stream of the evaporator coil
when the humidity level is above the specified set point.
The major components of the hot gas reheat option are the air coil
heat exch
anger, the hot gas reheat three-way valve, the option
card, and the unit control circuit.
The hot gas reheat option operates in the following sequence:
Validate that Operating Mode Dip Switch SW1 (Refer to
Fig. 23) position “3” is in the “ON” position.
The heat pump will run in Hot Gas Reheat mode ONLY when
cooling demand is satisfied and the unit thermostat calls for
humidity (H) when the level of humidity is above the desired
set point specified either by the:
— Wall Thermostat, or
— (For Units with DDC)—The Bosch Equipment Touch or
Building Management.
In Hot Gas Reheat mode, the pump will operate at full load
cooling and dehumidifying the air and then reheating it back
to a temperature close to the entering dry bulb temperature.
If there is a call for cooling while the unit is operating in the
reheat mode, then unit will revert to cooling until the demand
is satisfied.
13.5 Boilerless Control
CL series heat pumps can be provided with an optional Boilerless
Heat Control that can be field wired to enable an external heat
source. The Boilerless Control option would disable the heat
pump heating and a field auxiliary heat can be enabled.
The major components of the Boilerless Control option are the
option ca
rd, the unit control circuit, and the electric-auxiliary
heat.
The Boilerless Control option operates in the following sequence:
1. When equipped with electric heat:
Validates that Operating Mode Dip Switch SW1 (Refer to
Fig. 23) position “1” is in the “ON” position.
The heat pump switches from compressor heating to
Boilerless Control mode when the unit thermostat calls for
heating operation and the water in temperature thermistor
indicates that the supply water temperature is below the
desired set point specified either by:
— (For Units with Option Card)—The Cool Set Point
Potentiometer (
Refer to Fig. 23), or
— (For Units with DDC)—The Bosch Equipment Touch or
Building Management.
If, during a call for heating, the supply water temperature
climbs above the set point specified in the option card or
DDC (as indicated above), then the heat pump compressor
will start heating mode.
2. If not equipped with electric heat:
Validates that Operating Mode Dip Switch SW1 (Refer to
Fig. 23) position “1” is in the “ON” position.
The heat pump switches compressor OFF.
If, during a call for heating, the supply water temperature
climbs above the set point specified in the option card or
DDC (as indicated above), then the heat pump compressor
starts heating mode.
|
37
CL Series Heat Pumps — 8733838716 (2024/05)
To Next Page
Loading...
Need help?
General