McQuay IM-811, Руководство по установке и обслуживанию

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Page 10 IM-811
Service Disconnect Box
A service disconnect box is required as per NEC.
Fuse – HACR Breakers
Protection is to be provided by either fuses or HACR type
breakers. Refer to the unit nameplate and the following table
for the maximum overcurrent protection permitted.
Table 8: Maximum Overcurrent Protection
* Fuse or HACR Breaker of same value.
Line Voltage Wiring
Run all line voltage wiring through conduit from the service
disconnect box to the unit. Refer to the NEC (in Canada CEC)
for the correct size conduit based on the wire size. The conduit
must enter the control box through the hole provided in the
bottom. Note: hole is sized for ¾” conduit. If permitted by
code, flexible conduit is preferred to minimize vibration trans-
mission from the unit to the building.
Connect the line voltage wires to the L1, L2, and L3 terminals
of the definite purpose contactor (located in the unit control
box). Refer to the wiring diagram attached to the unit when
making these connections. The unit wiring diagram is also
included at the end of this manual.
The unit must be grounded. The electrical ground circuit must
consist of an appropriately sized electrical wire connecting to
the ground lug in the unit control box and wire to the building
electrical service panel. Other methods of grounding are per-
mitted if performed in accordance with the National Electric
Code (NEC)/American National Standards Institute (ANSI)/
National Fire Protection Association (NFPA) 70 and local/state
codes. In Canada, electrical grounding is to be in accordance
with the Canadian Electric Code CSA C22.1.
Low Voltage Connections
Units require a 5-conductor low voltage circuit from the room
thermostat. The wires are to be no smaller than 18 AWG. The
field connection for this circuit is to be made in the unit control
box using wire nuts or other solderless connectors. See Figures
8 and 9 for a typical low voltage hook-up.
Figure 8. Single Stage Low Voltage Hook-up
Figure 9. Two Stage Low Voltage Hook-up
Model Voltage *Max. Fuse
AHP090 208/230 60
AHP090 460 30
AHP120 208/230 60
AHP120 460 35
CONDENSING
UNIT
AHP090/120
AIR
HANDLER
SAH090/120
BLUE
WHITE
RED
BROWN
THERMOSTAT
Y O C
W2
G
R
GREEN
YELLOW
ORANGE
BLUE
WHITE
RED
CONDENSING
UNIT
AHP090/120
AIR
HANDLER
SAH090/120
BLUE
WHITE
RED
BROWN
THERMOSTAT
Y O C
W2
G R
GREEN
YELLOW
ORANGE
BLUE
WHITE
RED
W1