Auxiliary Heating Operation — Heat Pump Units —
Outdoor Temperature Below 40°F (4°C) — Hydronic
Option
Room temperature must be below 85°F (29°C) for
hydronic heater to operate on PTHP's with unit-mounted
controllers.
Hydronic valve is 24Vac normally open valve. Should power
be lost to the unit, the valve will default to open position.
1.
Place thermostat or system switch in
HEAT
position.
2.
Adjust thermostat to warmer temperature.
The following occurs:
• Signal from processor board activates water or
steam valve.
• Motorized valve opens and allows hot water or steam
to run through coil.
• Indoor fans run, blowing air through hydronic coil
• If unit is equipped with an Aquastat, indoor fan and
motorized damper operation is delayed until hydronic
coil reaches 100 ± 5°F (38 ± 3°C).
• The signal to the water or steam valve will continue
until the room temperature rises above the setpoint
by 3°F (2°C).
• After space gets warmer, hydronic valve will close
and indoor fan will switch off after sixty-second
purge time has elapsed.
3.
After space gets warmer, adjust thermostat to cooler
temperature setting, hydronic valve will close and
indoor fan will switch off after sixty-second purge time
has elapsed.
4.
If warmer room temperature is desired, adjust
thermostat to a warmer temperature setting, which will
open hydronic valve and turn on the indoor fan.
5.
If cooler room temperature is desired, adjust
thermostat to cooler temperature setting. Hydronic
valve will close and indoor fan will switch off after
sixty-second purge time has elapsed.
6.
Place the thermostat or system switch in the
OFF
position. All operation stops.
Testing Completion For Heat Pumps
Operation testing is complete.
If TEST jumper was set to test mode verify it is set back to
normal operation. See figure 11, page 19.
FINAL INSPECTION & START-UP
23
Made in USA
P/N 240010639, Rev. A [06/15/2014
]
