IM 368 / Page 11 of 20 (Rev. 11/03)
Equipment Startup
Initial startup of the Incremental
®
conditioners by experienced
personnel is usually the responsibility of the installing contractor.
This startup consists of inspecting and operating the equipment
for all functions at the time of initial installation, and making
necessary adjustments. It also includes demonstrating its proper
operation to the owner or his agent. Note that unless otherwise
specifically agreed to in writing, AAF–McQuay Incorporated
includes no field labor, startup service or the like in the price of
its equipment. After the equipment leaves the McQuay factory, it
may become damaged or maladjusted during transportation or
on the job. Sometimes wires are disconnected accidentally, or
fan motors move on their bases due to rough handling, causing
fans to strike. The correction of such conditions is part of the
startup.
Before Starting Equipment, Make Certain That:
1. Correct voltage has been supplied to the equipment.
2. The electrical plug from the control box has been inserted
into the receptacle.
During Startup (applies only to standard equipment):
1. Set manual ventilation damper to OPEN or CLOSED position
as required by owner. Set “auto-off” switch as required if unit
is equipped with electric fresh air damper.
2. Select HIGH on the fan speed rocker switch; push HEAT
button. Move thermostat to the extreme heating position
(counterclockwise). If the “CYCLE/CONSTANT” switch is
placed in the “CYCLE” position, Heat and indoor fan motor
should cycle on and off as the thermostat requires. Select
LOW on the fan speed rocker switch; fan should change to
low speed. If it is a heat pump unit, electric resistance neat
will be delivered at outdoor temperatures less than 30
°
F
(-1
°
C) to 35
°
F (1.6
°
C). Outdoor fan should be on whenever
compressor operates.
3. Select HIGH fan speed; push COOL button. Move thermostat
to the extreme cooling position (clockwise). Compressor and
indoor fan motor should cycle on and off as the thermostat
requires. Select LOW fan speed; fan should change to lower
speed. Outdoor fan should be on whenever compressor
operates.
4. Push FAN button. Indoor fan should operate at high or low
speed as selected. Neither heater nor compressor should
continue to operate.
5. Push STOP button. Fan should stop, and neither heater nor
compressor should continue to operate.
Note: Direction of conditioned air may be adjusted by
repositioning the discharge grille to change airflow pattern in a
room. The building superintendent or assistant manager should
be requested to make any changes.
Electrical Service
All wiring should should be done in accordance with all local and
National Electrical Code requirements. The conditioners are
supplied as follows:
Electrical Heating Unit
1. 208V and 230V models are supplied with an attachment cord
and plug which exit from beneath the conditioner on the
control side. The cord has a usable length of 72" (1829mm)
from where it exits the conditioner. The use of an extension
cord is not recommended. The attachment plug size should
be used to determine circuit ampacity and overcurrent
protection. Time delay fuses are recommended to avoid
nuisance tripping. The receptacle is generally mounted
beneath the conditioner, on or recessed in the wall so that it
is concealed by the conditioner overhang. The space under
the conditioner must be at least 3" (76mm) high.
2. An electrical subbase is available for 208V and 230V units
and contains a junction box for a field mounted receptacle.
All electrical connections are made within the subbase, thus
eliminating the need for a wall mounted receptacle. The
subbase is available in 3" (76mm) or 4" (102mm) height and
can be furnished with factory mounted fused disconnect option.
3. On all 265V models, an electrical subbase is required. The
chassis is supplied with a “short cord” which is just long enough
to plug into the subbase. A plug/cord cover is also furnished
with the subbase to make the interconnecting cord inaccessible,
as required by the National Electrical Code. The conditioner is
marked with the minimum circuit ampacity and maximum fuse size.
Hydronic Heating Unit
1. All hydronic units are supplied with a subbase. The subbase is
8" (203mm) high and houses both the hydronic heating coil
and the electrical connections.
2. A short cord is furnished to be plugged into the top of the sub-
base. A plug/cord cover is not furnished with these units.
3. A fused disconnect option is available and comes furnished
factory mounted.
Adjusting Temperature Limiting (Optional)
A temperature limiting device may be furnished as an option
to allow the owner to set the minimum and/or maximum
temperature selections. Adjust this device as follows:
1. Remove the two screws that secure the lower corners of the
front panel and remove the front panel.
2. Pull off the control knob and remove screws that hold down
polycarbonate membrane overlay.
3. Pull back overlay to gain access to the temperature limiting
device adjusting screw.
4. Loosen hold-down screw with Phillips screwdriver.
5. Adjust cams to attain desired rotation limit.
6. Tighten hold-down screw.
7. Replace overlay and secure with screws removed in step #2.
8. Once unit is in operation, rotate knob to maximum heat and/
or maximum cool to check temperature limits. Repeat
procedure listed above until desired temperature limitations
are achieved.
9. Replace front panel and tamper resistant front panel screws
removed in step #1.
