Johnson Controls RC Series Engineering Manual page 48

RC SERIES ENGINEERING GUIDE
Engineering Guide Specifi cations cont.
Unit mounted thermostat shall be the standard thermostat option.
All unit mounted thermostats shall be auto changeover. Manual
changeover WILL NOT be accepted. Electromechanical operation
WILL NOT be accepted.
Controls
Standard: A compressor control module (CCM) shall be
included to disable compressor operation in the event of a trip of
any of the safety switches and to send a signal to activate a fault
indicator light at the thermostat. The CCM shall be capable of being
reset from the thermostat or from the unit main disconnect switch.
A terminal block with screw terminals shall be provided for field
connection of all low-voltage wiring.
An Aurora microprocessor-based controller that interfaces with
a multi-stage electronic thermostat to monitor and control unit
operation shall be provided. The control shall provide operational
sequencing, blower speed control, high and low pressure switch
monitoring, freeze detection, condensate overflow sensing, lockout
mode control, LED status and fault indicators, fault memory, field
selectable options and accessory output. The control shall provide
fault retry three times before locking out to limit nuisance trips.
A detachable terminal block with screw terminals will be provided
for field control wiring. All units shall have knockouts for entrance of
low and line voltage wiring. The blower motor and control box shall
be harness plug wired for easy removal.
Option: Remote mounted thermostat is available for CCM and
Aurora Base Control. A terminal block with screw terminals will be
provided for field control wiring.
Piping
Supply and return water connections shall be 1/2 in. [12.7 mm]
FPT copper threaded fittings. All water piping shall be insulated to
prevent condensation at low liquid temperatures.
A stainless steel tube stubbed out from the chassis is provided for
condensate drain attachment. A short piece of polyvinyl hose is
supplied to assist in adapting to drain.
Accessories
Hose Kits – Ball Valves (field-installed)
A flexible steel braid hose featuring Kevlar® reinforced EPDM
core with ANSI 302/304 stainless steel outer braid and fire rated
materials per ASTM E 84-00 (NFPA 255, ANSI/UL 723 & UBC
8-1). Ball valve at one end; swivel connector with adapter at the
other end (swivel to adapter connection via fiber or EPDM gasket).
Swivel connection provides union between heat pump and piping
system. The hoses feature brass fittings, stainless steel ferrules.
A full port ball valve shall be provided with integral P/T (pressure/
temperature) port on supply hose. Specifi cations: Temperature
range of 35°F [2°C] to 180°F [82°C]. Max. working pressure of 400
psi [2757 kPa] for 1/2˝ and 3/4˝ hose kits; max. working pressure of
350 psi [kPa] for 1˝ and 1-1/4˝ hose kits.
Hose Kits - Automatic Balancing and Ball Valves
(field-installed)
A flexible steel braid hose featuring Kevlar® reinforced EPDM
core with ANSI 302/304 stainless steel outer braid and fire rated
materials per ASTM E 84-00 (NFPA 255, ANSI/UL 723 & UBC
8-1). Ball valve at one end; swivel connector with adapter at the
other end (swivel to adapter connection via fiber or EPDM gasket).
Swivel connection provides union between heat pump and piping
system. The hoses feature brass fittings, stainless steel ferrules.
A full port ball valve shall be provided with integral P/T (pressure/
temperature) port on supply hose and automatic balancing valve
with integral P/T ports and full port ball valve on return hose.
Specifi cations:
• Temperature range of 35°F [2°C] to 180°F [82°C].
• Max. working pressure of 400 psi [2757 kPa] for 1/2˝
and 3/4˝ hose kits; max. working pressure of 350 psi
[2413 kPa] for 1˝ and 1-1/4˝ hose kits.
• Minimum burst pressure of four times working pressure.
Hose Kits – Automatic Balancing and Ball Valves with 'Y'
strainer (field-installed)
A flexible steel braid hose featuring Kevlar® reinforced EPDM
core with ANSI 302/304 stainless steel outer braid and fire rated
materials per ASTM E 84-00 (NFPA 255, ANSI/UL 723 & UBC
8-1). Ball valve at one end; swivel connector with adapter at the
other end (swivel to adapter connection via fiber or EPDM gasket).
Swivel connection provides union between heat pump and piping
system. The hoses feature brass fittings, stainless steel ferrules.
A "y" strainer is provided on one end for fluid straining and integral
"blowdown" valve.. A full port ball valve shall be provided with
integral P/T (pressure/temperature) port on supply hose and
automatic balancing valve with integral P/T ports and full port ball
valve on return hose.
Specifi cations:
• Temperature range of 35°F [2°C] to 180°F [82°C].
• Max. working pressure of 400 psi [2757 kPa] for 1/2˝
and 3/4˝ hose kits; max. working pressure of 350 psi
[2413 kPa] for 1˝ and 1-1/4˝ hose kits.
• Minimum burst pressure of four times working pressure.
Auxiliary Heater (field-installed 208-230V units only)
An electric resistance heater shall provide supplemental and/
or emergency heating capability. A manual switch shall be
mounted on the side of the control compartment with "NORMAL"
or "BOILERLESS" mode. "NORMAL" will run the compressor
when there is a call for heating or cooling. "BOILERLESS" mode
operation will run electric heat whenever there is a call for heating
and run the compressor for a cooling call.
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