Startup
StartupStartup
Startup
After installing, connecting ductwork and condensate lines and
wiring, unit is ready for startup. Check all internal wire
connections and connections to external control devices.
Make certain the thermostat system switch is in the “OFF”
position and the fan switch is in the “AUTO” position. Also, the
electric box cover and access panels should be mounted in
place. You are now ready to turn on the power.
1. Turn the thermostat fan switch to the “ON” position. Unit
blower should start.
Note
:
:::
Unit
may
not
start
for
2-5
minutes
due
to
random
start
or
anti-short
cycle
relays.
2. Check the airflow and make sure no supply grilles or
duct dampers are closed to restrict airflow.
3. Set the thermostat temperature setting to low and turn the
systems switch to the heating mode.
4. Gradually increase the temperature to approximate room
temperature until unit starts.
5. After operating the unit for 10 minutes, check the air
temperature rise between supply and return airstreams. The
rise should be at least 18 F.
6. Using a surface pyrometer or other device, check entering
and leaving water temperatures. The recommended
temperature drop between entering and leaving water may
range from 5-9 F at 45 F EWT (Entering Water Temperature)
or from 8-15 F at 70 F EWT.
Note:
If
any
of
the
above
conditions
do
not
exist,
one
or
more
of
the
following
problems
exist:
low
airflow,
low
water
flow
or
unit
not
performing
properly.
7. Set the thermostat system switch to cooling mode and
reduce temperature setting gradually until unit starts.
After operating the unit for a few minutes, check if it is
functioning properly and providing satisfactory cooling.
Note:
Minimum
dry
bulb
temperature
drop
between
supply
and
return
airstreams
should
be
about
16
F.
A
water
temperature
rise
of
12-25
F
could
be
anticipated
at
relatively
low
water
flow
rates.
Maintenance
Air
AirAir
Air
Filters
FiltersFilters
Filters
Do not operate the heat pump without an air filter. Clean the
filters at least once every three months and more frequently in
dusty or unclean environments. Dirty filters will cause inefficient
heat pump performance.
Compressor
CompressorCompressor
Compressor
Mammoth heat pumps have been designed with switches that
protect the unit’s refrigerant system. They will automatically shut
down the compressor if refrigerant pressure rises too high or
drops too low.
Note: Some thermostats will indicate a compressor shut-down
with a “reset” light.
If the compressor shuts down, turn the thermostat system
switch off. Wait 10 minutes, then turn the switch back on and
restart the unit. If the compressor shuts down again after only
brief operation, a problem exists and a qualified service person
must be called in.
General
GeneralGeneral
General
Service
ServiceService
Service
Any repair or service on the unit must be performed by qualified
service personnel.
Options Operation
Cooling
CoolingCooling
Cooling
Only
OnlyOnly
Only
–
–––
Allows for no compressor heating operation.
The reversing valve is omitted.
Extended
ExtendedExtended
Extended
Range
RangeRange
Range
–
–––
Allows the unit to operate at lower entering
water temperatures. Includes freezestat, insulated piping and
insulated coaxial heat exchanger.
Geothermal
GeothermalGeothermal
Geothermal
–
–––
Allows unit to operate at geothermal
conditions. Includes freezestat, insulated piping and insulated
coaxial heat exchanger as well as larger heat transfer
surfaces.
Dirty
DirtyDirty
Dirty
Filter
FilterFilter
Filter
Switch
SwitchSwitch
Switch
–
–––
Includes filter switch located
downstream of filter which measures filter pressure drop.
Switch differential pressure setting is adjustable. If the suction
pressure rises to
the set point, the unit sends the common leg of the 24-volt
transformer out to a device (by others). Connection to this wire
is made through the perforated plastic grommet beneath the
terminal strip. See the wiring diagrams on the previous pages
for wiring details.
T
TTT
erminal
erminalerminal
erminal
Junction
JunctionJunction
Junction
Box
BoxBox
Box
–
–––
Includes an external sheet metal
enclosure over the terminal strip for conduit connection of
thermostat wiring.
75
7575
75
V
VVV
A
AAA
T
TTT
ransformer
ransformerransformer
ransformer
–
–––
Replaces the standard 50 VA transformer
and includes an integrated 4 amp resettable circuit breaker.
