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Programming, Operation – Robertshaw 9720 User Manual

Page 27

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14

NOTE: Both summer and winter programs use the same time settings and programmable fan settings.

Setting

Time

Summer

Winter

MORN

6:00 a.m.

78

70

DAY

8:00 a.m.

85

62

EVE

5:00 p.m.

78

70

NIGHT

10:00 p.m.

82

62

Setting

Time

Summer

Winter

MORN

DAY

EVE

NIGHT

Sample Program

Your Program

NOTE: New dip switch settings for dip switch #2 will not register or operate options until the RESET button is pressed.
Pressing RESET will erase any previously entered programming information.

NOTE: If "AUTO CHANGEOVER" was enabled during installation, refer to "SELECTING AUTO CHANGEOVER" for
restrictions on setting heating or cooling setpoint temperatures for proper operation. AUTO (changeover) will not
function unless the thermostat is set to PROGRAM mode. If "AUTO CHANGEOVER" was disabled during installation,
you may set heating or cooling setpoints to any temperature settings you desire.

PROGRAMMING

Compressor Protection

This thermostat is equipped with automatic compressor protection to prevent
potential damage due to short cycling or extended power outages. The short cycle
protection provides a 5-minute delay between heating and cooling cycles to
prevent compressor damage.

During extended power outages this thermostat provides an extra margin of
compressor protection in the heat mode by delaying the first stage of heating
(heat pump) from engaging until the compressor crankcase oil has been warmed.
This will help avoid compressor damage due to improper oil circulation during
cold weather conditions. This important safeguard will delay the first stage of
heating (heat pump) for 1 hour less than the power outage, for up to 12 hours
maximum. During this period the system will depend on the auxiliary stages of
heating to maintain the setpoint temperature.

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OPERATION