FIGURE 1: UNIT CUTAWAY
•Electric Heat Operation - All electric heat models (factory installed only) are wired for a single power source and include a bank of nickel chromium elements mounted at the discharge of the supply air blower to provide a high velocity and uniform distribution of air across the heating elements. Every element is fully protected against excessive current and temperature by fuses and two thermal limit switches.
•The power supply wiring can be routed into the control box through a threaded pipe connection in the base pan of the unit or through a knockout in the wiring panel on the front of the unit.
•BAS Controls - York’s Magnum series units offer factory mounted BAS controls such as Novar, Honeywell, Johnson, and CPC.
REHEAT MODE SEQUENCE OF OPERATION
The reheat control board allows the user to select two different modes of operation via a jumper connection on the board. (See Figure 2.) Each mode is described below. Refer to Figures 2 - 4 when reading this section.
Anytime there is a call for 2 stages of cooling, the unit will not operate in the reheat mode, even if there is a call for
LOCATION OF VFD (Optional)
LOCATION OF VFD BYPASS (Optional)
“NORMAL” MODE
When the reheat control board (RCB) detects a need for dehumidification (24VAC) at "HUM" via the field supplied dehumidistat connected to
When the room thermostat calls for first stage cooling, with or without a call for dehumidification, the RCB senses a signal through "Y1",
When the room thermostat calls for second stage cooling, the RCB senses a signal through "Y1" & "Y2" and engages circuit #1 and circuit #2 in the cooling mode.
Indoor blower operation is initiated upon a call for first stage cooling, second stage cooling or dehumidification.
dehumidification at "HUM".
Unitary Products Group | 5 |
