Mammoth HP-5 Microprocessor Control - Manual (Page 2)

MAMM‐WHSP‐IOM‐1HP5A (October 2011) 2
HP 5 Microprocessor Control
Important!
These instructions are for use by qualified
personnel specially trained and experienced in
the installation of this type of equipment and
related system components. Some states
require installation and service personnel to be
licensed. Unqualified individuals should not
attempt to interpret these instructions or install
this equipment. Read these instructions carefully
before opening (unpacking), installing and
operating this heat pump unit.
Definition
The HP 5 Microprocessor unit is designed to
operate with Mammoth’s existing series of wall
thermostats:
 Manual Changeover
 Auto Changeover with Night Setback,
Night Setup and Override
This unit can be used with other heat pump
thermostats, but some features may not be
available.
Features
 Low and high voltage protection.
 Check microprocessor at startup – self-
diagnostic
 Random start time delay from 5 to 35
seconds
 Compressor anti-short cycle protection
for 300 seconds (5 minutes)
 Compressor, fan and reversing valve
control
 Condensate overflow protection
 Compressor lockout with selectable
intelligent/manual reset
 LED status on the board
 Lockout alarm signal to an LED in the
wall thermostat in the event of a safety
circuit fault
 Fan interlock to automatically energize
the fan whenever the compressor is on
 Board operable on 50 and 60 cycle
power
 Emergency shutdown from a field-
supplied signal
 Unoccupied (night setback and night
setup) mode from a field-supplied
signal.
 Dry contact alarm signal for connection
of a fault signal to a DDC controller.
 Auxiliary dry contact for tie-in of a
motorized valve when the compressor is
on (or optional compressor status)
 Night heating or cooling operation from
the wall thermostat (71117203,
71117204 or 71117205 thermostat
required)
 Override of the unoccupied mode from
the thermostat for 2 hours (71117204 or
7111205 thermostat required)
 Low and high pressure compressor
protection
 Low pressure bypass with 0, 1, 2 and 3
minute selections.
Operation
INITIAL POWER-UP:
When power is applied to
the controller from unit's 24-volt transformer, a
"green” LED will be illuminated and a 120
second time delay will occur before the fan,
reversing valve and compressor are able to
operate. The controller will perform a self-
diagnostic and voltage check.
LOSS OF POWER:
On a loss of 24-volt power
to the board, all the outputs are de-activated. On
return of power, a 120 second time delay will
occur before the fan, reversing valve and
compressor are able to operate. After 120
seconds, the fan, reversing valve and
compressor are able to operate after a short
time delay.
RANDOM START:
A 5 to 35 second time delay
of fan, reversing valve and compressor
operation will occur each time the unit comes off
shutdown mode, unoccupied mode and low/high
voltage mode. The random start time varies
each time it is activated; for example, the time
delay may be 5 seconds, then 12, then 30, then
17, then 32, then 6, etc.
The following descriptions assume Initial
Power-up and Random Start functions have
occurred.