Titus Lynergy - Manual (Page 3)

3
DISCHARGE TEMPERATURE SET POINT. LineaHeat comes with a discharge temperature set point (DTS) option. This
option allows a maximum temperature to be set at the board to prevent overheating of discharge air. When the unit receives a
signal to start heating, the board will take an initial temperature reading and modulate heat from that point to the maximum
temperature. For example, if a thermostat requires only a 10% heating output of air that was initially 60°F and has a maximum
temperature setting of 90°F, the EHM will modulate the heater’s output temperature to 63°F (the additional 3 degrees coming
from (90-60)*10%). This allows heaters to be sized for morning warm up in the winter and still comfortably operate on those
days when the inlet temperatures are slightly warmer.
The discharge temperature sensor comes with a 9’ cable for mounting in the downstream ductwork. The sensor should be
mounted a minimum of 36” from the discharge of the unit and be vertically centered in the ductwork. The sensor can be
mounted by drilling a 1/2” hole into the ductwork, inserting the sensor, and securing it with 2 sheet metal screws. The sensor is
6” long, and the tip should not touch any part of the ductwork.
Neither the jumper settings nor the controls wiring needs to be changed when this option is ordered. The EHM control board
will detect if a sensor has been connected, and it will adjust the control function accordingly. The sensor wires are connected
to the screw terminals at the “Sensor” (6) location on the EHM. The connection at this termination is not polar sensitive and
the two wires may be switched with no effect.
The desired discharge temperature is set by rotating the discharge temperature set point dial arrow to the maximum outlet
temperature desired. To fine tune the discharge temperature set point, connect the positive and negative leads of a multimeter
to “Tcal” and “Com” (7), respectively, on the EHM. Then place a jumper between the two screw heads on the sensor
termination. Rotate the discharge temperature set point dial until the desired voltage per temperature is obtained. After the
voltage is obtained, the EHM board must be reset. To reset the board, remove the jumpers and then place back in correct
position.
It should be noted that ASHRAE Fundamentals Handbook (Chapter 31) states that discharging air at a temperature more than
15°F above the room (90°F in a 75°F room) will likely result in significant unwanted air temperature stratification.
It is recommended that heater output is ramped or staged when switching from cooling to heating modes. On initial call for
maximum or near maximum heat, from cooling mode, the heater may overshoot the desired temperature by up to 20°F for 10
to 20 seconds (on oversized heaters). As the EHM begins modulating heater output, the discharge temperature will quickly
drop to the desired set point. Temperatures within ±2°F of desired set point are reached within 90 seconds with oversized
heaters.
TEMP dc VOLT TEMP dc VOLT TEMP dc VOLT TEMP dc VOLT TEMP dc VOLT
68 0.00 80 0.58 90 0.95 100 1.23 110 1.44
69 0.05 81 0.62 91 0.98 101 1.25 111 1.46
70 0.10 82 0.66 92 1.01 102 1.27 112 1.48
71 0.15 83 0.70 93 1.04 103 1.30 113 1.50
72 0.20 84 0.74 94 1.07 104 1.32 114 1.51
73 0.26 85 0.77 95 1.10 105 1.34 115 1.53
74 0.30 86 0.81 96 1.12 106 1.36 116 1.55
75 0.35 87 0.85 97 1.15 107 1.38 117 1.56
76 0.40 88 0.88 98 1.18 108 1.40 118 1.58
77 0.44 89 0.91 99 1.20 109 1.42 119 1.60
78 0.49 120 1.61
79 0.53