8
SECOND-STAGE HEATING AND COOLING
DELAY AND TIMER SETTINGS
Second-stage heating and second-stage cooling delay can be activated by the ON or OFF switches
provided. You may select either or both. If you want to control the second-stage heat and/or cooling
with a single-stage thermostat, set the HTG-DELAY and/or CLG-DELAY slide switches to ON and set
the rotary Delay Timer for the desired delay time. The delay time will be the same for heating and
cooling. The timer is activated by a W1 or Y1 signal at the HVAC Output (Fig. 7a).
HEAT PUMP CONTROL OPERATION:
EMERGENCY HEAT OPERATION (HEAT PUMP ONLY )
All Arzel AirBoss™ system boards have emergency or backup heat capability. When the Emergency heat
mode is activated it will convert all “Y” signals to “W” signals, thus bypassing heat pump operation and
activating backup heat. Emergency heat mode can be initiated either with the “Emergency Heat” switch
on the panel, a remote (outdoor) thermostat or a call for “W1” in the Fossil Fuel mode. The
Emergency Heat Mode can also be initiated by using a 24V AC relay energized by a designated
thermostat’s “E” terminal. The relay Com-N/O contacts will provide closure to the Emergency Heat
Remote circuit.
STAGING WITH SINGLE-STAGE OR
TWO-STAGE THERMOSTATS
Staging can be accomplished with either single-stage or two-stage thermostats.
Single-stage thermostats: W1 and Y1 are controlled by the thermostat. W2 and Y2 are brought on
by the Arzel Heating and Cooling Delay Timer (see paragraph below).
Two-stage thermostats: W1, W2, Y1, and Y2 are all controlled by the thermostat. W2 and Y2 are
always delayed by 30 seconds to prevent both stages from coming on simultaneously.
(Fig. 7a)
(Fig. 7b)
Rev. 5/01/01
U.S. and Foreign Patents & patents pending.
© copyright 2004 by Arzel Zoning Technology, Inc.
Emergency heat mode is indicated by a red LED located to the right of the manual switch.
