Setting the thermostat
CAUTION
The main power to the system must be kept on
at all times to prevent damage to the outdoor unit
compressor. If necessary, use the thermostat control
switch to turn the system off. Should the main power
be disconnected or interrupted for 8 h or longer,
do not attempt to start the system for 8 h after the
power has been restored to the outdoor unit. If heat is
needed during this 8 h period, use emergency heat.
Thermostat
Although thermostats may vary widely in appearance,
they are all designed to perform the same basic function:
to control the operation of your air conditioning or
heat pump system. Regardless of size or shape, each
thermostat features the following:
• a temperature indicator
• a dial, arm, or push button for selection of the
required temperature
• a fan switch to choose the indoor fan operation
• a comfort switch for selection of the system mode of
operation
Note: Only approved thermostats have been tested
and are fully compatible with this equipment. Many
different thermostats operate on batteries or power
stealing principals. These types of thermostats
cannot be supported as trouble-free when used with
this product.
If your system is designed to allow both cooling and
heating operation, you may have either a manual
changeover type of thermostat or a programmable
electronic type of thermostat.
Manual changeover means that the comfort switch must
be manually positioned every time you want to switch
from the cooling to heating mode of operation or heating
to cooling mode of operation.
A complete operating instruction is provided by the
manufacturer for each thermostat.
Familiarize yourself with its correct operation to ensure
maximum comfort with minimum energy consumption.
The computerized electronic thermostat is an electronic
version of a manual changeover type of thermostat.
This thermostat includes features that allow set-back
temperature variations for nighttime or periods when
you are away from home during the day, reducing energy
costs. The thermostat also features a digital clock.
Cooling only
If your air conditioning system is designed to provide
cooling only (AC), with no capability for heating operation
(heat pump), a two-stage cooling only thermostat with a
manual, one-position Cool and Off comfort switch is all
that is required for system operation.
Cooling and heating, for heat pump units
If your system is designed to allow both cooling and
heating operation, you may have either a manual
changeover type of thermostat or a programmable
electronic type of thermostat with two stages of cooling
and two stages of heat.
Manual changeover
Manual changeover means that the comfort switch must
be manually positioned every time you want to switch
from the cooling to heating mode of operation or heating
to cooling mode of operation.
Start-up
Observe the maximum and minimum conditions for
operation to ensure your system delivers optimum
performance and requires minimum service.
Table 1: Minimum and maximum operating limit
conditions
Outdoor coil °F
(°C)
Indoor coil °F (°C)Air
temperature
DB cool DB heat WB cool DB heat
Minimum 35 (2) -13 (-25) 57 (14) 50 (10)
Maximum 125 (52) 75 (24) 72 (22) 80 (27)
Note: Refer to the NOTICE in the Reduced capacity
conditions section in the Installation Manual.
Note: Operation below listed temperatures is
permissible for a short period of time during
morning warm-up.
If the main power supply to the outdoor and indoor units
is off, place the system into operation as follows:
1. Enable the mode of operation.
2. Set the thermostat to the required temperature.
- Cooling: For cooling, the higher the setting, the
lower the amount of energy consumed. Federal
guidelines recommend a setting of 78°F (26°C).
- Heating: For heating, the lower the setting, the
lower the amount of energy consumed. Federal
guidelines recommend a setting of 65°F (18°C) or
lower.
Note: If your cooling and heating temperature
adjustments are separate, ensure to set both.
3. Set the mode of fan operation required.
Power failure
If a power failure occurs, the system automatically
resumes operation when power is restored, using the set-
points that were present when power was interrupted.
When accidents, wind, storms, or other issues disrupt
electrical power supply to your home, set the thermostat
to the Off position.
User's Information Manual: HH8 Series - 18 SEER2 Horizontal Discharge Variable Speed Heat Pump2
Johnson Controls Ducted Systems
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