HTP PH100-119, Installation & Maintenance Instructions Manual, Page: 41 / 60

41
LP-179 REV. 11.26.14
B. LINE VOLTAGE CONDENSATE OUTPUT
The heater has the capability of supplying power to a condensate pump. The connection is 120 VAC
+/- 10% at a max of 2 amps. Power is supplied to the pump only when the heater is connected to
power, and the power switch is in the on position.
C. LOW VOLTAGE OUTDOOR SENSOR INPUT
The heater has the capability of an outdoor reset. Connecting an outdoor sensor allows the heater to
operate at optimum efficiency. HTP offers an outdoor sensor, p/n 7250P-319.
The outdoor sensor must be a 12K NTC sensor. Use a minimum 22 AWG wire for runs of 100 feet or
less and minimum 18 AWG wire for runs up to 150 feet. Instructions are included with the outdoor
sensor to correctly mount the sensor on the exterior surface of the building. It is preferable to mount
the sensor on the north side in an area that will not be affected by direct sunlight but will be exposed to
varying weather conditions. Connect the outdoor sensor to terminals marked “Outdoor”.
D. ALARM CONNECTIONS
The control includes an alarm output. This circuit is rated at 3 amps at 120 volts. This contact can be
used to activate an alarm light or bell or notify a building management system if the water heater goes
into a lockout condition.
E. OPTIONAL 0-10 VOLT BUILDING CONTROL SIGNAL
A signal from a building management system may be connected to the water heater to enable remote
control. This signal should be a 0-10 volt positive-going DC signal. When this input is enabled using
the installer menu, a building control system can be used to control the set point temperature of the
water heater. The control interprets the 0-10 volt signal as follows; when the signal is between 0 and
1.5 volts, the water heater will be in standby mode, not firing. When the signal rises above 1.5 volts,
the water heater will ignite. As the signal continues to rise towards its maximum of 10 volts, the water
heater will increase in set point temperature. See Part 10 for details on the setting of function 16.
NOTE: During 0-10V operation, the minimum tank temperature set point (default 95
o
F) will be at the
activation input of 1.5 volts. The maximum temperature set point value will be at the input voltage of 10
volts. The maximum temperature set point can be changed by increasing or decreasing the
DU setting
(Range: 77
o
F
– 160
o
F / Default 119
o
F). Once programmed, the 0-10V feature will change the set point
temperature automatically.
1. Connect a building management system or other auxiliary control signal to the terminals marked 0-
10 VOLT + and 0-10 VOLT
– in the electronics assembly (shown in Figure 25). Caution should be
used to ensure that the 0-10 VOLT + connection does not become connected to ground.
2. Configuring the appliance for 0-10 volt operation (change only the functions in the descriptions below):
a. Press and hold {S3} and {S4} together for 5 seconds
b. Use {S1} and {S2} to adjust flashing |000| to code |975| . Press {S3} until you enter the menu.
c. Use {S3} to scroll to Function 16 to enable/disable 0-10 volt operation. Use {S1} and {S2} to adjust display to desired setting
(Range: 0 = Off, 2 = On / Default Off).
d. Press and hold
{S4} to exit the menu
It is of extreme importance that this unit be properly grounded. It is very important that the building
system ground is inspected by a qualified electrician prior to making this connection. Electrical
power must only be turned on when the heater is completely filled with cold water.
Label all wires prior to disconnecting them when servicing the heater. Wiring errors can cause
improper and dangerous operation. Failure to follow these instructions may result in property
damage or personal injury.
Figure 23
– Low Voltage
and Line Voltage Wiring